COMMAND

DESCRIPTION

COMMAND

DESCRIPTION

alias [alias- term

Allows the entering of shorter or easy-to-

kill [-9] pid

Terminates the process with the id-number

=['command-

remember names to execute longer or

pid-

String’]

hard-to-remember commands.

at [-m] time [date]

Schedules a command to run at a

less file

Displays the contents of the text file file a

particular time.

screenful at a time.

bc

A program to evaluate mathematical

In

Creates a link to a file so that it has more

equations.

than one name or resides in more than one

directory.

bg [job]

Continues a stopped job in the

logout

Terminates. the current UNIX session and

background.

log out of the system.

cal [month] [year]

Displays calendar

Is pattern

Lists the files and directories in a directory-

cat [filename]

Displays the contents of the file named by

man command

Displays the standard UNIX manual page

filename.

for the command you specify.

cd [directory]

Change to another directory. Entering cd

mkdir dir

creates a new directory named dir.

without the directory argument will move

you to your home directory.

chmod pemissions

Changes the access permission

more file

Displays the contents of the text file file a

path

associated with a file or directory

screenful at a time

chown usemame

Changes the ownership of the file or

mv name I name2

Moves and/or renames the file or directory,

path

directory, path,  to user usemame.

name I to name2.

cp file 1 file 2

Creates an identical copy of the file I, and

passwd

Changes your UNIX login password

names the - copy file2. Note that the

ownership of Me2 will be set to whoever

does the cp command.

date

Displays the current date and time.

ps

Displays a list of the processes currently

running on the machine that you are

logged into.

diff file I file 2

Compares the contents of two text files and

pwd

Displays the full path of your current

displays the differences. The lines

working directory.

preceded with < are from file l. The lines

preceded by > are from file2. Each section

of differences is separated by --.

du options

The du command summarizes disk usage.

rm file

Removes the file file permanently from the

du entered on the command line with no

filesystem. Note that deletion cannot be

options will return the size of all the

undone.

directories beneath the current working

directory

exit

Terminates the current UNIX shell.

rmdir dir

Deletes the empty subdirectory dir.

fg

Continues a stopped job by running it in

talk user

Allows you to communicate with another

the foreground

user using your terminal.

finger user

Displays information about user accounts.

tail Me

Lists the last few fines of file.

ftp

Connects to another computer to either get

teinet address

Logs into another machine specified by

a file(s) from the remote machine or to put

address.

a file(s) onto a remote machine.

grep pattem file

Searches one or more files, specified by

wc file

Counts the number of words or characters

fife, for the text string specified by pattern.

and lines in file.

head file

Displays the first few lines of a file

who

Displays a list of who is logged on to the

system and where they are logged on from

jobs

Lists the jobs that are running in either the

foreground or the background, and the jobs that are stopped.