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sum

Print a checksum for a file

symlink

Make a new name for a file

sync

Synchronize data on disk with memory

tac

Concatenate and write files in reverse

tail

Output the last part of files

tar

Tape ARchiver

tee

Redirect output to multiple files

time

Measure Program Resource Use

times

User and system times

top

List processes running on the system

touch

Change file timestamps

tr

Translate, squeeze, and/or delete characters

traceroute

Trace Route to Host trap Run a command when a signal is set(bourne)

tsort

Topological sort

tty

Print filename of terminal on stdin

type

Describe a command

ulimit

Limit user resources

umask

Users file creation mask umount Unmount a device

unalias

Remove an alias

uname

Print system information

unexpand

Convert spaces to tabs

uniq

Uniquify files

units

Convert units from one scale to another

unset

Remove variable or function names

unshar

Unpack shell archive scripts

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