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unset is a Unix shell command. It unsets a shell variable, removing it from memory and the shell's exported environment. It is implemented as a shell built-in, because it directly manipulates the internals of the shell.

Unix command line programs ( [ view] • [ talk] • [ edit] )
File and file system management:	cat \| chdir/cd \| chmod \| chown \| chgrp \| cp \| du \| df \| fdupes \| file \| fsck \| ln \| ls \| lsof \| mkdir \| more \| mount \| mv \| pwd \| rcp \| rm \| rmdir \| split \| touch \| tree
Process management:	anacron \| at \| chroot \| cron/crontab \| kill \| nice \| ps \| sleep \| time \| timex \| top \| renice \| wait
User Management/Environment:	env \| finger \| id \| locale \| mesg \| passwd \| su \| sudo \| uname \| uptime \| w \| who \| write
Text processing:	awk \| cut \| diff \| ex \| head \| iconv \| join \| less \| more \| nkf \| paste \| sed \| sort \| tail \| tr \| uniq \| wc \| xargs
Shell programming:	echo \| expr \| unset	Printing:	lp
Communications: inetd \| netstat \| ping \| rlogin \| traceroute	Searching: egrep \| fgrep \| find \| grep \| strings	Miscellaneous: banner \| bc \| cal \| man \| uname \| wall \| yes

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