UNIX
Command |
Description
of UNIX Command |
Example
of UNIX Command |
 |
| File Commands |
| cat |
Concatenates a file. |
cat filename |
|
| 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 |
|
| diff |
Displays the difference between two text files. |
diff filename1 filename2 |
|
| file |
Display file type. |
file filename |
|
| less |
Displays the file with minimal space. |
less filename |
|
| mail |
Read and send email messages. |
mail |
|
| 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 |
|
| 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 |
|
| wc |
Counts the number of lines |
wc filenames |
|
| 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) |
|
|
|
|
| Directory Commands |
| pwd |
Displays current directory path. |
pwd |
|
| echo $cwd |
Displays the logical path or directory. |
echo $cwd |
|
| cd |
Change directory. |
cd /usr/ |
|
| cd .. |
Go back one directory level. |
cd .. |
|
| ls |
Lists the contents of the current directory. |
ls -a |
|
| mkdir |
Make a directory. |
mkdir directory-name |
|
| rmdir |
Remove a directory. |
rmdir directory-name |
|
|
|
|
| General Commands |
| passwd |
Allows you to change your password. |
passwd |
|
| logout |
Ends your current session. |
logout |
|
| ps |
Displays current processes. |
ps |
|
| clear |
Clears the terminal screen. |
clear |
|
| quota -v |
Display disk usage. |
quota -v |
|
| gzip |
Compresses a file. |
gzip filename |
|
| gunzip |
Uncompresses a file. |
gunzip filename |
|
|
|
|
| Help Commands |
| apropos |
Commands for a specific topic. |
apropos mail |
|
| help |
A list of online help topics or help on a specific topic. |
help
help mail |
|
| man |
A list of manuals or a manual on a specific command. |
man
man mail |
|
| whatis |
A description of a specific command. |
whatis mail |
|
|
|
|
| Print Commands |
| lpr |
Prints a postscript file. |
lpr filename |
|
| enscript |
Prints text files to a postscript printer. |
enscript -Pprintername filename |
|
| printers |
Displays a list of printers and locations. |
printers |
|
| lpq |
Prints the current print queue. |
lpq -Pprintername |
|
| lprm |
Removes a print job from queue. |
lprm -Pprintername queuenumber |
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