whatis

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whatis searches a set of database files containing short descriptions of system commands for keywords and displays the result on the standard output. Only complete word matches are displayed. The whatis command is commonly found on Unix-like operating systems. The whatis database is created using the command makewhatis. Closely related commands include apropos and man.

Sample output:

$ whatis whatis
whatis(1)                - search the whatis database for complete words

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v t e Unix command-line interface programs and shell builtins
File system	cat chmod chown chgrp cksum cmp cp dd du df file fsck fuser ln ls mkdir mount mv pax pwd rm rmdir split tee touch type umask
Processes	at bg chroot cron fg kill killall nice pgrep pkill ps pstree time top
User environment	clear env exit finger history logname mesg passwd su sudo uptime talk tput uname w wall who whoami write
Text processing	awk banner basename comm csplit cut diff dirname ed ex fmt fold head iconv join less more nl paste printf sed sort spell strings tail tr uniq vi wc xargs yes
Shell builtins	alias cd echo test unset wait
Networking	dig host ifconfig inetd netcat netstat nslookup ping rdate rlogin route ssh traceroute
Searching	find grep locate whatis whereis
Documentation	apropos help man
Miscellaneous	bc dc cal expr lp od sleep true and false
List of Unix utilities

whatis

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