Cheat sheet for the LinkedIN course about Linux Command Line
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Command
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Option(s)
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Argument(s)
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ls
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-ahl
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/usr/bin
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sort
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-u
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users.txt
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grep
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-i "needle"
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heystack
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man
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argument
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argument
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--help
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apropos
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functionality search
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Tab
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Tab completion
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Ctrl - A
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Move to beginning of line
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Ctrl - E
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Move to end of line
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Ctrl - Left arrow
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Move left one word
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Ctrl - Rig arrow
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Move right one word
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Ctrl - U
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Delete from cursor to line start
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Ctrl - K
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Delete from cursor to line end
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Ctrl - Shift - C
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Copy selected text to clipboard
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Ctrl - Shift - V
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Paste text from clipboard
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Up arrow
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Recall previous command
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Down arrow
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Scroll previous command
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Ctrl - R
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Search command history
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Ctrl - C
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Cancel command
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Command
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Option(s)
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Argument(s)
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Description
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file
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argument
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Determine file type
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stat
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argument
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Display file status
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/
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File system root
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/home
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User home directories
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/root
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Root user's home directory
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/etc
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Common configuration files
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/bin, /sbin
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Common programs or commands
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/lib
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Shared libraries and modules
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/mnt, /media
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Standard location for mounting other file systems
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/dev, /proc, /sys
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Kernel and system information
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/
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Absolute path
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.
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Current working directory
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..
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Parent directory
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~
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Current user's home directory
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\ - space
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Equivalent to space key
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cd
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Change the shell working directory
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pwd
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Print the name of File system root: / User home directories: /home Root user's home directory: /root
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ls
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Command
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Option(s)
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Argument(s)
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Description
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cd
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available
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new directory
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Change the shell working directory
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pwd
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available
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Print the name of the current working directory
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ls
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-lh
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directory
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List information about the files
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Command
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Option(s)
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Argument(s)
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Description
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mkdir
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available
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directory(ies)
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Create the directory(ies)Create the directory(ies)
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rmdir
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available
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directory(ies)
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Remove the directory(ies), if they are empty
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cp
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available
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source - destination
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Copy source to destination
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mv
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available
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source - destination
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Move source to destination
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rm
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-r
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file(s)
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Remove the file(s) (recursively)
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find
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-name
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directory - "expression*?
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Find directory or file by name
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Command
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Option(s)
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Argument(s)
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Description
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grep
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options
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"pattern*? file name
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Search for patterns in file
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Command
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Option(s)
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Argument(s)
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Description
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cat
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available
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file name
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Concatenate to standard output
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head
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available
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file name
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Print the first number of something
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tail
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available
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file name
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Print the last number of something
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Command
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Description
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awk
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Often used to extract specific text from a file according to rule
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sed
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Often used to modify text in a command pipeline or in place
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sort
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Often used to sort text
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Command
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Option(s)
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Argument(s)
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Description
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ln
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-s
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source file link name
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Creates a soft link
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ln
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source file link name
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Creates a hard link
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User
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Group
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Others
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Description
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rwx
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rwx
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rwx
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Up to three letters indicate the permissions for the file or directory
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Command
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Option(s)
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Argument(s)
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Description
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chmod
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octal or symbolic change
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file or directory
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Changes the mode of the file or directory
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chown
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new owner
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file or directory
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Changes the owner of the file or directory
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chgrp
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new group
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file or directory
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Changes the group of the file or directory
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Command
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Option(s)
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Argument(s)
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Description
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tar
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-cvf
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file name.tar directory
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Creates a tape archive
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tar
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-caf
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file name.tar.gz/tar.bz2 directory
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Creates a compressed tape archive, the compression type depends on the extension
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tar
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-xf
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file name -C target directory
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Extracts a compressed tape archive inside a certain directory
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zip
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-r
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file name directory to compress
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Compresses a directory
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unzip
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file name -d target directory
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Extracts a directory
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sudo + command
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Executes the command with superuser rights (requires user password)
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sudo + -s
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Activates superuser rights for a period of time
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sudo + -k
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Gives up superuser rights
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env
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Set some attributes in the environment
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which
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Locate a command
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~/.bash_profile
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Bash profile (create with command nano)
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Stream
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Number
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Usage
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Standard Input (stdin)
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0
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Text input
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Standard Output (stdout)
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1
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Text output
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Standard Error (stderr)
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2
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Error text
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command
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number>
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file name
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Redirects the output to the file
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command
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number>>
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file name
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Appends the output to the file
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Command
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Description
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ls -l /etc/*release
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List of the files that contain information about the release
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cat /etc/*release
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Shows information about the two files in the release folder
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uname -a
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Show information about Linux Kernel
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uname -r
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Shows only the version of the Linux Kernel
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free -h
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Shows how much memory the system has
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cat /proc/cpuinfo
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Shows how much CPU the system has
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lscpu
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Shows more comprehensive information about the system's CPU
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df -h
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Shows how much storage the system has
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apt search search
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Looks for packages whose description match the search term
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apt show package
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Displays information about the package
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sudo apt update
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Retrieve an updated list of the packages from the repositories before installing new software or upgrading the software package
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sudo apt install package
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Install the package
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sudo apt upgrade
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Upgrade the software package
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