UNIX Commands

Commands for the UNIX operating system are case sensitive. UNIX commands are typically lower case. There can be up to three parts for each command i.e. command [options] arguments. Below are some common UNIX commands with descriptions and examples.

UNIX Command	Description of UNIX Command	Example of UNIX Command
apropos	Commands for a specific topic.	apropos mail
cd	Change directory.	cd /usr/
cd ..	Go back one directory level.	cd ..
cp	Copy a file.	cp oldfilename newfilename
chgrp	Change root of directory or file.	chgrp root filename
chown	Change ownership of director or file.	chown admin filename
chmod	Set permissions on directory or file.	chmod 755 filename
date	Displays current day, date and time.	date
file	Display file type.	file filename
finger	Displays who is logged in, or displays information about users.	finger finger login-name
gzip	Compresses a file.	gzip filename
gunzip	Uncompresses a file.	gunzip filename
help	A list of online help topics or help on a specific topic.	help help mail
less	Displays the file with minimal space.	less filename
logout	End your session.	logout
mail	Read and send email messages.	mail
man	A list of manuals or a manual on a specific command.	man man mail
mkdir	Make a directory.	mkdir directory-name
more	Displays the contents of a file with page breaks.	more filename
mv	Rename a file or directory or move a file to another directory.	mv oldfilename newfilename mv /etc/filename /usr/filename
pico	A basic text editor.	pico pico filename
pine	Read and send email messages. Has more features than mail.	pine
ps	Reports the status of the currently running processes.	ps ps options
pwd	Displays current directory path.	pwd
quota -v	Displays current disk usage and limits.	quota -v
rm	Remove (delete) a file.	rm filename
rmdir	Remove a directory.	rmdir directory-name
sort	Sort the lines of a text file alphabetically.	sort filename
vi	Text editor.	vi vi filename
w	Indicates who is currently logged in with more information than "who."	w
whatis	A description of a specific command.	whatis mail
who	Indicates who is currently logged in.	who
./	Execute a program from the command line.	./filename
*	Wildcard.	rm abc*.pl (This will delete all files starting with abc and ending with .pl)

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