instruction stringlengths 17 36 | input stringclasses 1
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What is git-var command | # git var
> Prints a Git logical variable's value. See `git config`, which is preferred
> over `git var`. More information: https://git-scm.com/docs/git-var.
* Print the value of a Git logical variable:
`git var {{GIT_AUTHOR_IDENT|GIT_COMMITTER_IDENT|GIT_EDITOR|GIT_PAGER}}`
* [l]ist all Git logical variables:
`git ... | |
What is make command | # make
> Task runner for targets described in Makefile. Mostly used to control the
> compilation of an executable from source code. More information:
> https://www.gnu.org/software/make/manual/make.html.
* Call the first target specified in the Makefile (usually named "all"):
`make`
* Call a specific target:
`make ... | |
What is uudecode command | # uudecode
> Decode files encoded by `uuencode`. More information:
> https://manned.org/uudecode.
* Decode a file that was encoded with `uuencode` and print the result to `stdout`:
`uudecode {{path/to/encoded_file}}`
* Decode a file that was encoded with `uuencode` and write the result to a file:
`uudecode -o {{pat... | |
What is diff command | # diff
> Compare files and directories. More information: https://man7.org/linux/man-
> pages/man1/diff.1.html.
* Compare files (lists changes to turn `old_file` into `new_file`):
`diff {{old_file}} {{new_file}}`
* Compare files, ignoring white spaces:
`diff --ignore-all-space {{old_file}} {{new_file}}`
* Compare... | |
What is ln command | # ln
> Creates links to files and directories. More information:
> https://www.gnu.org/software/coreutils/ln.
* Create a symbolic link to a file or directory:
`ln -s {{/path/to/file_or_directory}} {{path/to/symlink}}`
* Overwrite an existing symbolic link to point to a different file:
`ln -sf {{/path/to/new_file}} ... | |
What is cal command | # cal
> Prints calendar information. More information:
> https://ss64.com/osx/cal.html.
* Display a calendar for the current month:
`cal`
* Display previous, current and next month:
`cal -3`
* Display a calendar for a specific month (1-12 or name):
`cal -m {{month}}`
* Display a calendar for the current year:
`... | |
What is file command | # file
> Determine file type. More information: https://manned.org/file.
* Give a description of the type of the specified file. Works fine for files with no file extension:
`file {{path/to/file}}`
* Look inside a zipped file and determine the file type(s) inside:
`file -z {{foo.zip}}`
* Allow file to work with s... | |
What is vi command | # vi
> This command is an alias of `vim`.
* View documentation for the original command:
`tldr vim` | |
What is pwdx command | # pwdx
> Print working directory of a process. More information:
> https://manned.org/pwdx.
* Print current working directory of a process:
`pwdx {{process_id}}` | |
What is locate command | # locate
> Find filenames quickly. More information: https://manned.org/locate.
* Look for pattern in the database. Note: the database is recomputed periodically (usually weekly or daily):
`locate "{{pattern}}"`
* Look for a file by its exact filename (a pattern containing no globbing characters is interpreted as `... | |
What is rm command | # rm
> Remove files or directories. See also: `rmdir`. More information:
> https://www.gnu.org/software/coreutils/rm.
* Remove specific files:
`rm {{path/to/file1 path/to/file2 ...}}`
* Remove specific files ignoring nonexistent ones:
`rm -f {{path/to/file1 path/to/file2 ...}}`
* Remove specific files [i]nteracti... | |
What is ldapsearch command | # ldapsearch
> Query an LDAP directory. More information: https://docs.ldap.com/ldap-
> sdk/docs/tool-usages/ldapsearch.html.
* Query an LDAP server for all items that are a member of the given group and return the object's displayName value:
`ldapsearch -D '{{admin_DN}}' -w '{{password}}' -h {{ldap_host}} -b
{{base_... | |
What is git-clean command | # git clean
> Remove untracked files from the working tree. More information: https://git-
> scm.com/docs/git-clean.
* Delete files that are not tracked by Git:
`git clean`
* Interactively delete files that are not tracked by Git:
`git clean -i`
* Show what files would be deleted without actually deleting them:
`... | |
What is git-bugreport command | # git bugreport
> Captures debug information from the system and user, generating a text file
> to aid in the reporting of a bug in Git. More information: https://git-
> scm.com/docs/git-bugreport.
* Create a new bug report file in the current directory:
`git bugreport`
* Create a new bug report file in the specifi... | |
What is keyctl command | # keyctl
> Manipulate the Linux kernel keyring. More information:
> https://manned.org/keyctl.
* List keys in a specific keyring:
`keyctl list {{target_keyring}}`
* List current keys in the user default session:
`keyctl list {{@us}}`
* Store a key in a specific keyring:
`keyctl add {{type_keyring}} {{key_name}} {... | |
What is dpkg-query command | # dpkg-query
> A tool that shows information about installed packages. More information:
> https://manpages.debian.org/latest/dpkg/dpkg-query.1.html.
* List all installed packages:
`dpkg-query --list`
* List installed packages matching a pattern:
`dpkg-query --list '{{libc6*}}'`
* List all files installed by a pa... | |
What is git-blame command | # git blame
> Show commit hash and last author on each line of a file. More information:
> https://git-scm.com/docs/git-blame.
* Print file with author name and commit hash on each line:
`git blame {{path/to/file}}`
* Print file with author email and commit hash on each line:
`git blame -e {{path/to/file}}`
* Pri... | |
What is login command | # login
> Initiates a session for a user. More information: https://manned.org/login.
* Log in as a user:
`login {{user}}`
* Log in as user without authentication if user is preauthenticated:
`login -f {{user}}`
* Log in as user and preserve environment:
`login -p {{user}}`
* Log in as a user on a remote host:
... | |
What is git-show-index command | # git show-index
> Show the packed archive index of a Git repository. More information:
> https://git-scm.com/docs/git-show-index.
* Read an IDX file for a Git packfile and dump its contents to `stdout`:
`git show-index {{path/to/file.idx}}`
* Specify the hash algorithm for the index file (experimental):
`git show-... | |
What is crontab command | # crontab
> Schedule cron jobs to run on a time interval for the current user. More
> information: https://crontab.guru/.
* Edit the crontab file for the current user:
`crontab -e`
* Edit the crontab file for a specific user:
`sudo crontab -e -u {{user}}`
* Replace the current crontab with the contents of the giv... | |
What is install command | # install
> Copy files and set attributes. Copy files (often executable) to a system
> location like `/usr/local/bin`, give them the appropriate
> permissions/ownership. More information:
> https://www.gnu.org/software/coreutils/install.
* Copy files to the destination:
`install {{path/to/source_file1 path/to/source_... | |
What is colrm command | # colrm
> Remove columns from `stdin`. More information: https://manned.org/colrm.
* Remove first column of `stdin`:
`colrm {{1 1}}`
* Remove from 3rd column till the end of each line:
`colrm {{3}}`
* Remove from the 3rd column till the 5th column of each line:
`colrm {{3 5}}` | |
What is resolvectl command | # resolvectl
> Resolve domain names, IPv4 and IPv6 addresses, DNS resource records, and
> services. Introspect and reconfigure the DNS resolver. More information:
> https://www.freedesktop.org/software/systemd/man/resolvectl.html.
* Show DNS settings:
`resolvectl status`
* Resolve the IPv4 and IPv6 addresses for on... | |
What is ssh-keygen command | # ssh-keygen
> Generate ssh keys used for authentication, password-less logins, and other
> things. More information: https://man.openbsd.org/ssh-keygen.
* Generate a key interactively:
`ssh-keygen`
* Generate an ed25519 key with 32 key derivation function rounds and save the key to a specific file:
`ssh-keygen -t ... | |
What is pidstat command | # pidstat
> Show system resource usage, including CPU, memory, IO etc. More information:
> https://manned.org/pidstat.
* Show CPU statistics at a 2 second interval for 10 times:
`pidstat {{2}} {{10}}`
* Show page faults and memory utilization:
`pidstat -r`
* Show input/output usage per process id:
`pidstat -d`
... | |
What is git-stash command | # git stash
> Stash local Git changes in a temporary area. More information: https://git-
> scm.com/docs/git-stash.
* Stash current changes, except new (untracked) files:
`git stash push -m {{optional_stash_message}}`
* Stash current changes, including new (untracked) files:
`git stash -u`
* Interactively select ... | |
What is git-bisect command | # git bisect
> Use binary search to find the commit that introduced a bug. Git
> automatically jumps back and forth in the commit graph to progressively
> narrow down the faulty commit. More information: https://git-
> scm.com/docs/git-bisect.
* Start a bisect session on a commit range bounded by a known buggy commit... | |
What is systemd-ac-power command | # systemd-ac-power
> Report whether the computer is connected to an external power source. More
> information: https://www.freedesktop.org/software/systemd/man/systemd-ac-
> power.html.
* Silently check and return a 0 status code when running on AC power, and a non-zero code otherwise:
`systemd-ac-power`
* Addition... | |
What is getopt command | # getopt
> Parse command-line arguments. More information:
> https://www.gnu.org/software/libc/manual/html_node/Getopt.html.
* Parse optional `verbose`/`version` flags with shorthands:
`getopt --options vV --longoptions verbose,version -- --version --verbose`
* Add a `--file` option with a required argument with sh... | |
What is pkill command | # pkill
> Signal process by name. Mostly used for stopping processes. More
> information: https://www.man7.org/linux/man-pages/man1/pkill.1.html.
* Kill all processes which match:
`pkill "{{process_name}}"`
* Kill all processes which match their full command instead of just the process name:
`pkill -f "{{command_na... | |
What is ssh-keyscan command | # ssh-keyscan
> Get the public ssh keys of remote hosts. More information:
> https://man.openbsd.org/ssh-keyscan.
* Retrieve all public ssh keys of a remote host:
`ssh-keyscan {{host}}`
* Retrieve all public ssh keys of a remote host listening on a specific port:
`ssh-keyscan -p {{port}} {{host}}`
* Retrieve cert... | |
What is test command | # test
> Check file types and compare values. Returns 0 if the condition evaluates to
> true, 1 if it evaluates to false. More information:
> https://www.gnu.org/software/coreutils/test.
* Test if a given variable is equal to a given string:
`test "{{$MY_VAR}}" == "{{/bin/zsh}}"`
* Test if a given variable is empty... | |
What is systemd-notify command | # systemd-notify
> Notify the service manager about start-up completion and other daemon status
> changes. This command is useless outside systemd service scripts. More
> information: https://www.freedesktop.org/software/systemd/man/systemd-
> notify.html.
* Notify systemd that the service has completed its initializ... | |
What is pr command | # pr
> Paginate or columnate files for printing. More information:
> https://www.gnu.org/software/coreutils/pr.
* Print multiple files with a default header and footer:
`pr {{file1}} {{file2}} {{file3}}`
* Print with a custom centered header:
`pr -h "{{header}}" {{file1}} {{file2}} {{file3}}`
* Print with numbere... | |
What is git-symbolic-ref command | # git symbolic-ref
> Read, change, or delete files that store references. More information:
> https://git-scm.com/docs/git-symbolic-ref.
* Store a reference by a name:
`git symbolic-ref refs/{{name}} {{ref}}`
* Store a reference by name, including a message with a reason for the update:
`git symbolic-ref -m "{{mess... | |
What is tty command | # tty
> Returns terminal name. More information:
> https://www.gnu.org/software/coreutils/tty.
* Print the file name of this terminal:
`tty` | |
What is git-instaweb command | # git instaweb
> Helper to launch a GitWeb server. More information: https://git-
> scm.com/docs/git-instaweb.
* Launch a GitWeb server for the current Git repository:
`git instaweb --start`
* Listen only on localhost:
`git instaweb --start --local`
* Listen on a specific port:
`git instaweb --start --port {{1234... | |
What is newgrp command | # newgrp
> Switch primary group membership. More information:
> https://manned.org/newgrp.
* Change user's primary group membership:
`newgrp {{group_name}}`
* Reset primary group membership to user's default group in `/etc/passwd`:
`newgrp` | |
What is dircolors command | # dircolors
> Output commands to set the LS_COLOR environment variable and style `ls`,
> `dir`, etc. More information:
> https://www.gnu.org/software/coreutils/dircolors.
* Output commands to set LS_COLOR using default colors:
`dircolors`
* Output commands to set LS_COLOR using colors from a file:
`dircolors {{path... | |
What is utmpdump command | # utmpdump
> Dump and load btmp, utmp and wtmp accounting files. More information:
> https://manned.org/utmpdump.
* Dump the `/var/log/wtmp` file to `stdout` as plain text:
`utmpdump {{/var/log/wtmp}}`
* Load a previously dumped file into `/var/log/wtmp`:
`utmpdump -r {{dumpfile}} > {{/var/log/wtmp}}` | |
What is lp command | # lp
> Print files. More information: https://manned.org/lp.
* Print the output of a command to the default printer (see `lpstat` command):
`echo "test" | lp`
* Print a file to the default printer:
`lp {{path/to/filename}}`
* Print a file to a named printer (see `lpstat` command):
`lp -d {{printer_name}} {{path/t... | |
What is git-verify-tag command | # git verify-tag
> Check for GPG verification of tags. If a tag wasn't signed, an error will
> occur. More information: https://git-scm.com/docs/git-verify-tag.
* Check tags for a GPG signature:
`git verify-tag {{tag1 optional_tag2 ...}}`
* Check tags for a GPG signature and show details for each tag:
`git verify-t... | |
What is du command | # du
> Disk usage: estimate and summarize file and directory space usage. More
> information: https://ss64.com/osx/du.html.
* List the sizes of a directory and any subdirectories, in the given unit (KiB/MiB/GiB):
`du -{{k|m|g}} {{path/to/directory}}`
* List the sizes of a directory and any subdirectories, in human-... | |
What is pgrep command | # pgrep
> Find or signal processes by name. More information:
> https://www.man7.org/linux/man-pages/man1/pkill.1.html.
* Return PIDs of any running processes with a matching command string:
`pgrep {{process_name}}`
* Search for processes including their command-line options:
`pgrep --full "{{process_name}} {{param... | |
What is bc command | # bc
> An arbitrary precision calculator language. See also: `dc`. More
> information: https://manned.org/man/freebsd-13.0/bc.1.
* Start an interactive session:
`bc`
* Start an interactive session with the standard math library enabled:
`bc --mathlib`
* Calculate an expression:
`bc --expression='{{5 / 3}}'`
* E... | |
What is git-credential-cache command | # git credential-cache
> Git helper to temporarily store passwords in memory. More information:
> https://git-scm.com/docs/git-credential-cache.
* Store Git credentials for a specific amount of time:
`git config credential.helper 'cache --timeout={{time_in_seconds}}'` | |
What is git-log command | # git log
> Show a history of commits. More information: https://git-scm.com/docs/git-
> log.
* Show the sequence of commits starting from the current one, in reverse chronological order of the Git repository in the current working directory:
`git log`
* Show the history of a particular file or directory, including... | |
What is quota command | # quota
> Display users' disk space usage and allocated limits. More information:
> https://manned.org/quota.
* Show disk quotas in human-readable units for the current user:
`quota -s`
* Verbose output (also display quotas on filesystems where no storage is allocated):
`quota -v`
* Quiet output (only display quo... | |
What is git-format-patch command | # git format-patch
> Prepare .patch files. Useful when emailing commits elsewhere. See also `git
> am`, which can apply generated .patch files. More information: https://git-
> scm.com/docs/git-format-patch.
* Create an auto-named `.patch` file for all the unpushed commits:
`git format-patch {{origin}}`
* Write a `... | |
What is false command | # false
> Returns a non-zero exit code. More information:
> https://www.gnu.org/software/coreutils/false.
* Return a non-zero exit code:
`false` | |
What is iconv command | # iconv
> Converts text from one encoding to another. More information:
> https://manned.org/iconv.
* Convert file to a specific encoding, and print to `stdout`:
`iconv -f {{from_encoding}} -t {{to_encoding}} {{input_file}}`
* Convert file to the current locale's encoding, and output to a file:
`iconv -f {{from_enc... | |
What is sync command | # sync
> Flushes all pending write operations to the appropriate disks. More
> information: https://www.gnu.org/software/coreutils/sync.
* Flush all pending write operations on all disks:
`sync`
* Flush all pending write operations on a single file to disk:
`sync {{path/to/file}}` | |
What is diff command | # diff
> Compare files and directories. More information: https://man7.org/linux/man-
> pages/man1/diff.1.html.
* Compare files (lists changes to turn `old_file` into `new_file`):
`diff {{old_file}} {{new_file}}`
* Compare files, ignoring white spaces:
`diff --ignore-all-space {{old_file}} {{new_file}}`
* Compare... | |
What is rmdir command | # rmdir
> Remove directories without files. See also: `rm`. More information:
> https://www.gnu.org/software/coreutils/rmdir.
* Remove specific directories:
`rmdir {{path/to/directory1 path/to/directory2 ...}}`
* Remove specific nested directories recursively:
`rmdir -p {{path/to/directory1 path/to/directory2 ...}}... | |
What is shuf command | # shuf
> Generate random permutations. More information: https://www.unix.com/man-
> page/linux/1/shuf/.
* Randomize the order of lines in a file and output the result:
`shuf {{filename}}`
* Only output the first 5 entries of the result:
`shuf --head-count={{5}} {{filename}}`
* Write output to another file:
`shuf... | |
What is git-bundle command | # git bundle
> Package objects and references into an archive. More information:
> https://git-scm.com/docs/git-bundle.
* Create a bundle file that contains all objects and references of a specific branch:
`git bundle create {{path/to/file.bundle}} {{branch_name}}`
* Create a bundle file of all branches:
`git bundl... | |
What is link command | # link
> Create a hard link to an existing file. For more options, see the `ln`
> command. More information: https://www.gnu.org/software/coreutils/link.
* Create a hard link from a new file to an existing file:
`link {{path/to/existing_file}} {{path/to/new_file}}` | |
What is systemd-delta command | # systemd-delta
> Find overridden systemd-related configuration files. More information:
> https://www.freedesktop.org/software/systemd/man/systemd-delta.html.
* Show all overridden configuration files:
`systemd-delta`
* Show only files of specific types (comma-separated list):
`systemd-delta --type
{{masked|equiva... | |
What is namei command | # namei
> Follows a pathname (which can be a symbolic link) until a terminal point is
> found (a file/directory/char device etc). This program is useful for finding
> "too many levels of symbolic links" problems. More information:
> https://manned.org/namei.
* Resolve the pathnames specified as the argument parameter... | |
What is lastcomm command | # lastcomm
> Show last commands executed. More information:
> https://manpages.debian.org/latest/acct/lastcomm.1.en.html.
* Print information about all the commands in the acct (record file):
`lastcomm`
* Display commands executed by a given user:
`lastcomm --user {{user}}`
* Display information about a given com... | |
What is egrep command | # egrep
> Find patterns in files using extended regular expression (supports `?`, `+`,
> `{}`, `()` and `|`). More information: https://manned.org/egrep.
* Search for a pattern within a file:
`egrep "{{search_pattern}}" {{path/to/file}}`
* Search for a pattern within multiple files:
`egrep "{{search_pattern}}" {{pa... | |
What is setfacl command | # setfacl
> Set file access control lists (ACL). More information:
> https://manned.org/setfacl.
* Modify ACL of a file for user with read and write access:
`setfacl -m u:{{username}}:rw {{file}}`
* Modify default ACL of a file for all users:
`setfacl -d -m u::rw {{file}}`
* Remove ACL of a file for a user:
`setf... | |
What is paste command | # paste
> Merge lines of files. More information:
> https://www.gnu.org/software/coreutils/paste.
* Join all the lines into a single line, using TAB as delimiter:
`paste -s {{path/to/file}}`
* Join all the lines into a single line, using the specified delimiter:
`paste -s -d {{delimiter}} {{path/to/file}}`
* Merg... | |
What is busctl command | # busctl
> Introspect and monitor the D-Bus bus. More information:
> https://www.freedesktop.org/software/systemd/man/busctl.html.
* Show all peers on the bus, by their service names:
`busctl list`
* Show process information and credentials of a bus service, a process, or the owner of the bus (if no parameter is sp... | |
What is readlink command | # readlink
> Follow symlinks and get symlink information. More information:
> https://www.gnu.org/software/coreutils/readlink.
* Print the absolute path which the symlink points to:
`readlink {{path/to/symlink_file}}` | |
What is sh command | # sh
> Bourne shell, the standard command language interpreter. See also
> `histexpand` for history expansion. More information: https://manned.org/sh.
* Start an interactive shell session:
`sh`
* Execute a command and then exit:
`sh -c "{{command}}"`
* Execute a script:
`sh {{path/to/script.sh}}`
* Read and ex... | |
What is mpstat command | # mpstat
> Report CPU statistics. More information: https://manned.org/mpstat.
* Display CPU statistics every 2 seconds:
`mpstat {{2}}`
* Display 5 reports, one by one, at 2 second intervals:
`mpstat {{2}} {{5}}`
* Display 5 reports, one by one, from a given processor, at 2 second intervals:
`mpstat -P {{0}} {{2}... | |
What is nm command | # nm
> List symbol names in object files. More information: https://manned.org/nm.
* List global (extern) functions in a file (prefixed with T):
`nm -g {{path/to/file.o}}`
* List only undefined symbols in a file:
`nm -u {{path/to/file.o}}`
* List all symbols, even debugging symbols:
`nm -a {{path/to/file.o}}`
*... | |
What is logger command | # logger
> Add messages to syslog (/var/log/syslog). More information:
> https://manned.org/logger.
* Log a message to syslog:
`logger {{message}}`
* Take input from `stdin` and log to syslog:
`echo {{log_entry}} | logger`
* Send the output to a remote syslog server running at a given port. Default port is 514:
`... | |
What is fallocate command | # fallocate
> Reserve or deallocate disk space to files. The utility allocates space
> without zeroing. More information: https://manned.org/fallocate.
* Reserve a file taking up 700 MiB of disk space:
`fallocate --length {{700M}} {{path/to/file}}`
* Shrink an already allocated file by 200 MiB:
`fallocate --collaps... | |
What is mkfifo command | # mkfifo
> Makes FIFOs (named pipes). More information:
> https://www.gnu.org/software/coreutils/mkfifo.
* Create a named pipe at a given path:
`mkfifo {{path/to/pipe}}` | |
What is git-credential-store command | # git credential-store
> `git` helper to store passwords on disk. More information: https://git-
> scm.com/docs/git-credential-store.
* Store Git credentials in a specific file:
`git config credential.helper 'store --file={{path/to/file}}'` | |
What is kill command | # kill
> Sends a signal to a process, usually related to stopping the process. All
> signals except for SIGKILL and SIGSTOP can be intercepted by the process to
> perform a clean exit. More information: https://manned.org/kill.
* Terminate a program using the default SIGTERM (terminate) signal:
`kill {{process_id}}`
... | |
What is exec command | # exec
> Replace the current process with another process. More information:
> https://linuxcommand.org/lc3_man_pages/exech.html.
* Replace with the specified command using the current environment variables:
`exec {{command -with -flags}}`
* Replace with the specified command, clearing environment variables:
`exec ... | |
What is ln command | # ln
> Creates links to files and directories. More information:
> https://www.gnu.org/software/coreutils/ln.
* Create a symbolic link to a file or directory:
`ln -s {{/path/to/file_or_directory}} {{path/to/symlink}}`
* Overwrite an existing symbolic link to point to a different file:
`ln -sf {{/path/to/new_file}} ... | |
What is sha224sum command | # sha224sum
> Calculate SHA224 cryptographic checksums. More information:
> https://www.gnu.org/software/coreutils/manual/html_node/sha2-utilities.html.
* Calculate the SHA224 checksum for one or more files:
`sha224sum {{path/to/file1 path/to/file2 ...}}`
* Calculate and save the list of SHA224 checksums to a file:... | |
What is tr command | # tr
> Translate characters: run replacements based on single characters and
> character sets. More information: https://www.gnu.org/software/coreutils/tr.
* Replace all occurrences of a character in a file, and print the result:
`tr {{find_character}} {{replace_character}} < {{path/to/file}}`
* Replace all occurre... | |
What is chattr command | # chattr
> Change attributes of files or directories. More information:
> https://manned.org/chattr.
* Make a file or directory immutable to changes and deletion, even by superuser:
`chattr +i {{path/to/file_or_directory}}`
* Make a file or directory mutable:
`chattr -i {{path/to/file_or_directory}}`
* Recursivel... | |
What is git-reset command | # git reset
> Undo commits or unstage changes, by resetting the current Git HEAD to the
> specified state. If a path is passed, it works as "unstage"; if a commit
> hash or branch is passed, it works as "uncommit". More information:
> https://git-scm.com/docs/git-reset.
* Unstage everything:
`git reset`
* Unstage s... | |
What is uuidgen command | # uuidgen
> Generate new UUID (Universally Unique IDentifier) strings. More information:
> https://www.ss64.com/osx/uuidgen.html.
* Generate a UUID string:
`uuidgen` | |
What is git-clone command | # git clone
> Clone an existing repository. More information: https://git-
> scm.com/docs/git-clone.
* Clone an existing repository into a new directory (the default directory is the repository name):
`git clone {{remote_repository_location}} {{path/to/directory}}`
* Clone an existing repository and its submodules:... | |
What is cups-config command | # cups-config
> Show technical information about your CUPS print server installation. More
> information: https://www.cups.org/doc/man-cups-config.html.
* Show the currently installed version of CUPS:
`cups-config --version`
* Show where CUPS is currently installed:
`cups-config --serverbin`
* Show the location o... | |
What is mkfifo command | # mkfifo
> Makes FIFOs (named pipes). More information:
> https://www.gnu.org/software/coreutils/mkfifo.
* Create a named pipe at a given path:
`mkfifo {{path/to/pipe}}` | |
What is logger command | # logger
> Add messages to syslog (/var/log/syslog). More information:
> https://manned.org/logger.
* Log a message to syslog:
`logger {{message}}`
* Take input from `stdin` and log to syslog:
`echo {{log_entry}} | logger`
* Send the output to a remote syslog server running at a given port. Default port is 514:
`... | |
What is git-apply command | # git apply
> Apply a patch to files and/or to the index without creating a commit. See
> also `git am`, which applies a patch and also creates a commit. More
> information: https://git-scm.com/docs/git-apply.
* Print messages about the patched files:
`git apply --verbose {{path/to/file}}`
* Apply and add the patch... | |
What is strings command | # strings
> Find printable strings in an object file or binary. More information:
> https://manned.org/strings.
* Print all strings in a binary:
`strings {{path/to/file}}`
* Limit results to strings at least length characters long:
`strings -n {{length}} {{path/to/file}}`
* Prefix each result with its offset with... | |
What is hexdump command | # hexdump
> An ASCII, decimal, hexadecimal, octal dump. More information:
> https://manned.org/hexdump.
* Print the hexadecimal representation of a file, replacing duplicate lines by '*':
`hexdump {{path/to/file}}`
* Display the input offset in hexadecimal and its ASCII representation in two columns:
`hexdump -C {{... | |
What is git-update-index command | # git update-index
> Git command for manipulating the index. More information: https://git-
> scm.com/docs/git-update-index.
* Pretend that a modified file is unchanged (`git status` will not show this as changed):
`git update-index --skip-worktree {{path/to/modified_file}}` | |
What is valgrind command | # valgrind
> Wrapper for a set of expert tools for profiling, optimizing and debugging
> programs. Commonly used tools include `memcheck`, `cachegrind`, `callgrind`,
> `massif`, `helgrind`, and `drd`. More information: http://www.valgrind.org.
* Use the (default) Memcheck tool to show a diagnostic of memory usage by ... | |
What is od command | # od
> Display file contents in octal, decimal or hexadecimal format. Optionally
> display the byte offsets and/or printable representation for each line. More
> information: https://www.gnu.org/software/coreutils/od.
* Display file using default settings: octal format, 8 bytes per line, byte offsets in octal, and du... | |
What is uuencode command | # uuencode
> Encode binary files into ASCII for transport via mediums that only support
> simple ASCII encoding. More information: https://manned.org/uuencode.
* Encode a file and print the result to `stdout`:
`uuencode {{path/to/input_file}} {{output_file_name_after_decoding}}`
* Encode a file and write the result... | |
What is cmp command | # cmp
> Compare two files byte by byte. More information:
> https://www.gnu.org/software/diffutils/manual/html_node/Invoking-cmp.html.
* Output char and line number of the first difference between two files:
`cmp {{path/to/file1}} {{path/to/file2}}`
* Output info of the first difference: char, line number, bytes, a... | |
What is hostname command | # hostname
> Show or set the system's host name. More information:
> https://manned.org/hostname.
* Show current host name:
`hostname`
* Show the network address of the host name:
`hostname -i`
* Show all network addresses of the host:
`hostname -I`
* Show the FQDN (Fully Qualified Domain Name):
`hostname --fqd... | |
What is od command | # od
> Display file contents in octal, decimal or hexadecimal format. Optionally
> display the byte offsets and/or printable representation for each line. More
> information: https://www.gnu.org/software/coreutils/od.
* Display file using default settings: octal format, 8 bytes per line, byte offsets in octal, and du... | |
What is b2sum command | # b2sum
> Calculate BLAKE2 cryptographic checksums. More information:
> https://www.gnu.org/software/coreutils/b2sum.
* Calculate the BLAKE2 checksum for one or more files:
`b2sum {{path/to/file1 path/to/file2 ...}}`
* Calculate and save the list of BLAKE2 checksums to a file:
`b2sum {{path/to/file1 path/to/file2 .... | |
What is git-status command | # git status
> Show the changes to files in a Git repository. Lists changed, added and
> deleted files compared to the currently checked-out commit. More
> information: https://git-scm.com/docs/git-status.
* Show changed files which are not yet added for commit:
`git status`
* Give output in [s]hort format:
`git st... | |
What is time command | # time
> Measure how long a command took to run. Note: `time` can either exist as a
> shell builtin, a standalone program or both. More information:
> https://manned.org/time.
* Run the `command` and print the time measurements to `stdout`:
`time {{command}}` | |
What is split command | # split
> Split a file into pieces. More information: https://ss64.com/osx/split.html.
* Split a file, each split having 10 lines (except the last split):
`split -l {{10}} {{filename}}`
* Split a file by a regular expression. The matching line will be the first line of the next output file:
`split -p {{cat|^[dh]og}... | |
What is su command | # su
> Switch shell to another user. More information: https://manned.org/su.
* Switch to superuser (requires the root password):
`su`
* Switch to a given user (requires the user's password):
`su {{username}}`
* Switch to a given user and simulate a full login shell:
`su - {{username}}`
* Execute a command as a... | |
What is w command | # w
> Show who is logged on and what they are doing. Print user login, TTY, remote
> host, login time, idle time, current process. More information:
> https://ss64.com/osx/w.html.
* Show logged-in users information:
`w`
* Show logged-in users information without a header:
`w -h`
* Show information about logged-in... |
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