Unix Commands

Command	Description
passwd	Change user password
pwd	Print current directory
cd	Change directory
ls	List of the file in the directory
Wildcards	* matches any number of characters, ? matches a single character
file	Print the type of file
cat	Display the contents of a file
pr	Display the contents of a file
pg or page	Display the contents of a file one page at a time
more	Display the contents of a file one page at a time
clear	Clear the screen
cp or copy	Copy a file
chown	Change the owner of a file
chgrp	Change the group of a file
chmod	Change file modes, permissions
rm	Remove a file from the system
mv	Rename the file
mkdir	Create a directory
rmdir	Remove a directory
grep	Pattern Matching
egrep	Grep command with extended regular expression
find	Used to locate files or directories
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
whoami	Display $LOGNAME or $USER environment parameter
who am i	Display login name, terminal, login date/time, and where logged in
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	File system 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