Linux CLI (Level 1)
FUN WITH LINUX COMMAND LINE
This is a list of command line (CLI) functions you can use on *most Unix style systems. This list is more for the beginners looking to get something done from a command line. These are pretty basic and really not that exciting.
*Note some of these commands are specific to the bash shell or Operating System Distro.
# -- Copying and Moving Files -- #
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# Copy a file
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$ cp filename filename.backup
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# Shortcut or the same command
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$ cp filename{,.backup}
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# Move a file
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$ mv filename filename.backup
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# Shortcut or the same command
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$ mv filename{,.backup}
# -- grep commands -- #
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# Search log files directory for "something"
# -- Navigation -- #
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$ cd path
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# Navigate directory via command line
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$ cd ~
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# Return to home directory
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$ cd -
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# Go back to last directory
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$ mc
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# Command line "GUI" Midnight Commander
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$ tree
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# Hierarchical display
# -- VI fun -- #
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# To edit multiple files in vi
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:split filename
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# If you don't know the name of the
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# other file you want to edit you can use this sequence
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:split # to open another session
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edit . # to navigate to another file. (Notice the period after the edit command)
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# Or a shortcut of
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:split.
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# When editing multiple files you switch between each file by
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# hitting <ctrl> ww
# -- System Commands -- #
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$ top
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# Displays dynamic real-time view of a running system
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# Additional trick from within top, is you type ? you
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# get a list of commands you can run within top
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$ uptime
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# Tells how long the system has been running
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$ kill PID
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# Kills the application association with the PID number defined
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$ kill -9 PID
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# When a normal kill wont do the job, the switch -9
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# forces the system to kill a process
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$ df -h
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# Reports filesystem disk space usage. The switch -h makes
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# it "Human Readable"
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$ du -h --max-depth=2
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# Estimates file space usuage. -h makes it "Human Readabl"
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# and the -max-depth=2 only executes the commands down 2 levels.
# Command line applications
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$ lynx
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# Command line web browser
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$ pine
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# Command line email reader
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$ mutt
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# Another Command line email reader
# -- Misc -- #
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$ man command
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# Gives you the manual pages for a specified command (example man cp)
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$ cal
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# Displays a Calendar
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$ cal -3
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# Displays Previous, Current, and Next month calendars
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$ date
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# Display current time and date
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$ whereis program
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# Searches common locations for the program
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$ whatis program
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# A short synopsis of what a program is.
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$ locate
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# Find a files location via internal database
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$ find / -name filename
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# A manual search for a file. In this case the
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# first argument of / (slash) means the entire system.
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# Searches can be narrowed down by define a path in this
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# place such as /home
# -- OTHER IMPORTANT COMMANDS WORTH DOING A 'man' ON -- #
