Basic Unix Commands

This tutorial is intended to give you the basics about a few simple, easy to learn UNIX commands that will enable you to use your  Server better. This is in no way intended to be comprehensive, but you do not need to know a lot about UNIX to use your server. If you find your knowledge needs to be seriously increased further than we have here, we encourage you to get a good book on UNIX commands.


Command List

pwd <unix.shtml> ls <unix.shtml> mkdir <unix.shtml> rmdir <unix.shtml> cp <unix.shtml> mv <unix.shtml> rm <unix.shtml> grep <unix.shtml> tar <unix.shtml> zip <unix.shtml> unzip <unix.shtml> compress <unix.shtml> vi <unix.shtml> pico <unix.shtml> cd <unix.shtml> locate <unix.shtml> ||(pipe) <unix.shtml>



1. Command: pwd

Usage: The pwd command tells you what the current working directory you are in.

Example: Simply type "pwd" at a telnet command prompt and it will return something like
"/home/sites/yahoo.com"



2. Command: ls

Usage: The ls command lists the files and subdirectories of the current directory you are in. You can also add some arguments to the ls command to make it more meaningful.

If you type "ls -F" it will append a forward slash to the subdirectory names so you can easily distinguish them from file names.

If you type "ls -a" it will show all hidden files such as .htaccess files.

If you type "ls -l" it will show detailed information about each file and directory, including permissions, owners, size, and when the file was last modified.

Example: Type "ls -al" at a telnet command prompt and it will return your file names including hidden files.

DOS Equivalent: dir


3. Command: mkdir

Usage: The mkdir command makes a new directory. Simply type "mkdir directory" at a telnet command prompt and replace directory with the name of the directory you want to create.

Example: Type "mkdir temp" at a telnet command prompt to create a new directory called temp.

DOS Equivalent: md, mkdir



4. Command: rmdir

Usage: The rmdir command deletes (removes) a directory. Simply type "rmdir directory" at a telnet command prompt and replace directory with the name of the directory you want to delete.

Example: Type "rmdir temp" at a telnet command prompt to remove a directory called temp.

DOS Equivalent: rd, rmdir



5. Command: cp

Usage: The cp command copies a file to a new location or filename. Simply type "cp filename copyname" at a telnet command prompt and replace filename with the name of the file you want to copy, and copyname with the name of the new copy.

You can also add a directory structure if you want to copy the file to a completely new location. Simply type "cp filename directory/copyname" and replace directory with the name of the directory in which you want the new copy placed.

Example: Type "cp home.htm index.html" at a telnet command prompt to copy a file called home.htm to a file called index.html

DOS Equivalent: copy



6. Command: mv

Usage: The mv command renames a file or moves it to a new location. Simply type "mv oldfile newfile" at a telnet command prompt and replace oldfile with the name of the file you want to rename or move, and newfile with the new name of the new file.

You can also add a directory structure if you want to move the file to a completely new location. Simply type "mv oldfile directory/newfile" and replace directory with the name of the directory in which you want the file moved.

Example: Type "mv test.conf test.old.conf" at a telnet command prompt to move a file called test.conf to a file called test.old.conf

DOS Equivalent: move, rename



7. Command: rm

Usage: The rm command deletes (removes) a file. Simply type "rm filename" at a telnet command prompt and replace filename with the name of the file you want to delete.

Example: Type "rm test.html" at a telnet command prompt to remove a file called test.html.

DOS Equivalent: del



8. Command: grep

Usage: The grep command finds lines in files that match specified text patterns. Simply type "grep "text" filenames" at a telnet command prompt and replace "text" with the word or phrase you want to search for, and replace filenames with the files you want to search in. To search all files in the current directory, simply replace filenames with *

Example: Type "grep "for sale" *" at a telnet command prompt to find any files in the current directory that contain the text "for sale" in them.


9. Command: tar

Usage: The tar command copies a file or files to or from an archive. To put all the files in a directory into one tar format file, simply type "tar cvf tarfile directory" at a telnet command prompt and replace tarfile with the name you want to call your archived file, and replace directory with the name of the directory that contains the files you want to tar.

To extract the files fram a tar format archive, simply type "tar xvf tarfile" at a telnet command prompt and replace tarfile with the name of the archived file you are extracting.

Example: Type "tar cvf pages.tar htdocs" at a telnet command prompt to archive the files in the htdocs directory to a tar format file called pages.tar.

You could also type "tar xvf pages.tar" at a telnet command prompt to extract into the current directory the files in the archive pages.tar.



10. Command: zip

Usage: The zip command compresses a file or list of files into a zip format archive file. This command is compatable with pkzip on a pc. Simply type "zip zipfile file1 file2 file3" at a telnet command prompt and replace zipfile with the name you want to use for your compressed zip archive file, and replace fileX with the name of the file(s) you want to compress into the zip archive.

Example: Type "zip back.zip home.html index.html" at a telnet command prompt to compress and archive the files called home.html and index.html into the file called back.zip.

DOS Equivalent: pkzip



11. Command: unzip

Usage: The unzip command extracts a zip format archive file. This command is compatible with pkunzip files from a pc. Simply type "unzip zipfile" at a telnet command prompt and replace zipfile with the name of your zip format archive file.

Example: Type "unzip old.zip" at a telnet command prompt to extract the archive called old.zip.

DOS Equivalent: pkunzip


12. Command: compress

Usage: The compress command shrinks a file or files into compressed versions to save space on your virtual server. This command is good for you to use on your log files when they get very large. Simply type "compress filename(s)" at a telnet command prompt and replace filename(s) with the name of your files you want to compress.

Example: Type "compress access_log agent_log" at a telnet command prompt to compress the access_log and agent_log files. The compressed files will then be access_log.Z and agent_log.Z


14. Command : vi

Vi is a text editor for editing files directly on the server. It can be used for editing html, cgi, .htaccess, and any other text based files on the server.

Here is a brief description of how to us vi:

Use the arrow keys to move the cursor.
You can only type when in insert mode.
"shift-a" Puts you in insert mode at the end of the line.
While in insert mode, you can use backspace on what you just typed.
"i" Puts you in insert mode at the cursor.
Escape key takes you out of insert mode.
"x" Deletes the character at the cursor when not in insert mode.
":q!" Quits without saving.
":wq" Saves the file and quits.

15. Command: pico

Pico is another text editor that you can use to edit text files on the server. It can be used in the same place that vi can. There are not any special commands to use pico like vi. The only thing you need to remember is to use the Ctrl key instead of the shift key for the carat symbol. All the commands are listed along the bottom of the screen. When you have made changes, use Ctrl o to save changes before exiting.

16. Command: cd

Usage: The cd command allows you to change directories.

Example: Type "cd cgi-bin". This will move you into the cgi-bin directory.

17. Command: locate

Usage: The locate command allows you to find a directory or file on the server, for instance if you cannot remember the path to sendmail.

Example: Type "locate sendmail" and every file and directory on the server that has the word sendmail in the name will be listed.

18. Command: | (symbol for pipe)

Usage: The pipe symbol allows for the output of one command to be the input of another command.

Example: Type "ld |more". This combines two commands together to further define the commands.

This is the short list of helpful UNIX commands for you to use feel free to contact IMCorp with any questions Webmaster@InternetMasters.every1.net .