COMMAND DESCRIPTION
rm Remove a file from the system
mv Rename a file
mkdir Create a directory
rmdir Remove a directory
gre p Pattern matching
egrep grep command for extended regular expressions
find Used to locate files and directories
>> Append to the end of a file
> Redirect, create, or overwrite a file
| Pipe, used to string commands together
|| Logical OR—command1 || command2—execute command2
if command1 fails
& Execute in background
&& Logical AND—command1 && command2—execute
command2 if command1 succeeds
date Display the system date and time
echo Write strings to standard output
sleep Execution halts for the specified number of seconds
wc Count the number of words, lines, and characters in a file
head View the top of a file
tail View the end of a file
diff Compare two files
sdiff Compare two files side by side (requires 132-character
display)
spell Spell checker
lp, lpr, enq, qprt Print a file
lpstat Status of system print queues
enable Enable, or start, a print queue
disable Disable, or stop, a print queue
cal Display a calendar
who Display information about users on the system
w Extended who command
whoami Display $LOGNAME or $USER environment parameter
who am I Display login name, terminal, login date/time, and where
logged in
f, finger Information about logged-in users including the users .plan
and .project
talk Two users have a split screen conversation
write Display a message on a user’s screen
wall Display a message on all logged-in users’ screens
rwall Display a message to all users on a remote host
rsh or remsh Execute a command, or log in, on a remote host
df Filesystems statistics
ps Information on currently running processes
netstat Show network status
vmstat Show virtual memory status
iostat Show input/output status
uname Name of the current operating system, as well as machine
information
sar System activity report
basename Base filename of a string parameter
man Display the on-line reference manual
su Switch to another user, also known as super-user
cut Write out selected characters
awk Programming language to parse characters
sed Programming language for character substitution
vi Start the vi editor
emacs Start the emacs editor
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