UNIX Command

Unix Commands	Description	Options
ls	lists the content of a directory	-a Displays all files, including hidden files -I Displays a detailed listing -R Displays the files recursively (i.e. in the sub-directories) -d Displays only the directories and not their content -S Sort by size -t Sort by the last modification date -t Sort by version -X Sort by alphabetical order of the extension -r Sort in reverse order
cd	change directory	cd Return to the user's directory cd - Return to the previous directory cd .. Return to the parent directory
mkdir	Create a new directory
rmdir	Deletes a directory	-f Force the deletion -R Recursive delete (i.e. in the directory and its sub-directories)
cp	Copy a file	copy, xcopy
mv	move file	move
rm	delete the file	-f Force the deletion -R Recursive delete (i.e. in the directory and its sub-directories)
pwd	"print working directory" displays the full current directory path of the work in progress.
passwd	changes the user password
cat	Concatenates two files and displays the result on the standard output.	cat
more	Displays the file content with pauses
file	displays the presumed type of the specified file
man apropos	help for the requested command
lpr	prints the requested file
chmod	changes the attribute of a file chmod XXX file XXX= User|Group|Other where X is an integer between 1 and 7 Read = 4, Write = 2, Execution = 1 X= Read + Write + Execution
chfn	Changes the personal information viewed with finger
chsh	Changes the shell: chsh user emplacement_du_shell
clear	Clears the lines displayed on the terminal
finger, who	list of users online
traceroute	traces the path between the local machine and the target machine
ping	diagnostic tool making it possible to see if a machine responds over the network
ftp[machine] [port] get put quit	file transfer between the local machine and target machine recovers a file sends a file quits the FTP session	ftp
telnet [machine]	performs a telnet	telnet
talk	makes it possible to talk to a connected user talk user
mesg	Authorizes or rejects the talk command mesg n : Prevents reception of talk messages mesg y: Allows reception of talk messages
exit	Disconnects