Linux CLI References

Published 10 months ago.
Last updated August 22nd, 2024

Linux System


`uname -a`	Print Linux system info.
`cat /etc/os-release`	Print more Linux system info.
`printenv`	Print all environment variables.
`hostname`	Print the hostname of the Linux system.

Files and Directories

Make Dirs


`mkdir <dir-name>`	Make a new directory at the current location.
`mkdir --parents /some/dir/path/data/<dir-name>`	Make a new directory in anew deep dir structure at the current location.
`mkdir --parents /some/dir/path/data/{<dir-name-1>,<dir-name-2>}`	Make two new directories in a new deep dir structure at the current location.
`mkdir --mode=0600 --parents /some/dir/path/data/{<dir-name-1>,<dir-name-2>}`	Make two new directories in a new deep dir structure at the current location and give all directories read and write permissions.

Find Files and Dirs


`find <top-path-to-search> -name '<file-or-dir-name>'`	Find all files and directories with a specific name.
`find <top-path-to-search> -type f -name '<file-name>'`	Find all files with a specific name.
`find <top-path-to-search> -type d -name '<dir-name>'`	Find all directories with a specific name.
`find "$PWD" \| sort -h`	List all paths in the current directory.

File Permissions


`chmod +x '<the-file-name>'`	Make a file executable by the current user.

Users and Groups


`getent passwd`	List all the users in the Linux system.
`getent group \| grep <the-username>`	List all groups for a user in the Linux system.
`getent group`	List all the user groups in the Linux system.

Package Managers


`apk add <package-name>`	Add a package to Alpine Linux.
`apk add --no-cache <package-name>`	Add a package to Alpine Linux and do not save the downloaded files.
`apk list -i`	List all packages installed on Alpine Linux.
`apt list --installed`	List all packages installed on Debian Linux.
`cpanm --no-wget <package-name>`	Install a new package with CPAN.