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Function: output the first part of files
Usage: head [OPTION]... [FILE]...
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Function: print the route packets trace to network host
Usage: traceroute6 [options]
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Function: check and repair a Linux file system
Usage: fsck [-sAVRTMNP] [-C [fd]] [-t fstype] [filesys...] [--] [fs-specific-options]
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Function: search the whatis database for complete words.
Usage: whatis keyword ...
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Function: print name of current/working directory
Usage: pwd [OPTION]...
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Function: display a line of text
Usage: echo LONG-OPTION
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Function: change group ownership
Usage: chgrp [OPTION]... --reference=RFILE FILE...
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Function: remove empty directories
Usage: rmdir [OPTION]... DIRECTORY...
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Function: print effective userid
Usage: whoami [OPTION]...
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Function: convert text from one character encoding to another
Usage: iconv [options] [-f from-encoding] [-t to-encoding] [inputfile]...
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Function: list file attributes on a Linux second extended file system
Usage: lsattr [ -RVadv ] [ files... ]
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Function: display Linux tasks
Usage: top -hv | -abcHimMsS -d delay -n iterations -p pid [, pid ...]
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Function: Print network connections, routing tables, interface statis-tics, masquerade connections, and multicast memberships
Usage: netstat {--statistics|-s} [--tcp|-t] [--udp|-u] [--raw|-w] [delay]
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Function: initialize a terminal or query terminfo database
Usage: tput [-Ttype] init
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Function: remove sections from each line of files
Usage: cut OPTION... [FILE]...