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Function: make directories
Usage: mkdir [OPTION]... DIRECTORY...
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Function: execute a command as another user
Usage: sudo -l [-AknS] [-a type] [-g group] [-h host] [-p prompt] [-U user] [-u user] [command]
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Function: Write a message to all users
Usage: wall [-n] [ message ]
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Function: build and execute command lines from standard input
Usage: xargs [options] [command [initial-arguments]]
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Function: show who is logged on
Usage: who [OPTION]... [ FILE | ARG1 ARG2 ]
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Function: read Info documents
Usage: info [OPTION]... [MENU-ITEM...]
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Function: pattern scanning and processing language
Usage: gawk [ POSIX or GNU style options ] -f program-file [ -- ] file ...
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Function: clear the terminal screen
Usage: clear
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Function: make links between files
Usage: ln [OPTION]... TARGET... DIRECTORY
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Function: search for files in a directory hierarchy
Usage: find [-H] [-L] [-P] [-D debugopts] [-Olevel] [path...] [expression]
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Function: determine file type
Usage: file [-bchikLNnprsvz0] [--apple] [--mime-encoding] [--mime-type] [-e testname] [-F separator] [-f namefile] [-m magicfiles] file ...
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Function: queue, examine or delete jobs for later execu-tion
Usage: at -c job [job...]
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Function: Vi IMproved, a programmers text editor
Usage: vim [options] -t tag
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Function: Tell how long the system has been running.
Usage: uptime [options]
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Function: print newline, word, and byte counts for each file
Usage: wc [OPTION]... [FILE]...