Basic Unix Commands

Branded Software and Custom Screensavers

Web Hosting

Web Site Design

Support

Basic Unix Commands

1.	Plain file manipulation
a.	mv mv fred wilma This moves fred to a file named wilma. This is the Unix way of renaming a file. mv fred flintstones/fred This moves fred to a file named fred in the subdirectory flintstones. This example could have been written mv fred flintstones/ as well, and the filename fred would have been retained in the new directory. After executing this command, there will no longer be a fred file in the current directory.
b.	cp cp fred wilma This copies fred to a file named wilma. cp fred flintstones/fred This copies fred to a file named fred in the subdirectory flintstones.
c.	rm rm flintstones This removes a file named flintstones. rm -rf flintstones This removes a directory named flintstones. The -r removes the directory, the -f forces it to remove files without asking you before it deletes each one.
2.	Directory manipulation In order to keep track of the possibly millions of files on-line, Unix systems have a directory tree, which enables meaningful classification of files. For example, the most essential system programs are kept in /bin/, user home directories are all under /home/, and everything having to do with the WWW is under /www/. More specifically, your home directory is /home/you/ and the directory for your WWW files is www/htdocs/you/.
a.	pwd pwd This prints out your working directory: where you are. When you give a filename to a command without specifying some other directory, the filename is looked up, manipulated, or created in your current working directory.
b.	mkdir mkdir flintstones This makes a subdirectory of the current directory named flintstones.
c.	cd cd flintstones This changes the directory to the subdirectory named flintstones. cd /home/flintstones This changes the directory to the home directory of the flintstones. cd /www/htdocs/flintstones This changes the directory to the WWW directory of the flintstones. cd With no arguments, cd returns you to your home directory.
d.	rmdir rmdir flintstones This removes the subdirectory flintstones. The directory must be empty for this to work.
3.	Account management
a.	ln (redirecting file access) Type ln -s fred.html index.html to redirect all file accesses from index.html to the file fred.html.
b.	passwd (changing your password) Type passwd to change your password.
c.	zip/unzip Type zip to zip files and unzip to unzip files. This program is compatible with the zip program for DOS. For example: zip myzip file1 file2 file3 This puts the files file1, file2, and file3 into a new zip archive called myzip.zip. On the other hand, if you had the archive myzip.zip and wanted to get back the files: unzip myzip, typing zip or unzip by itself will give you a usage summary, showing nearly all the options availible.
d.	du (disk usage) The Unix command du -s directory shows how much disk space is used by a directory and everything below it. While we work on creating the complicated command needed to automatically check all the directories you are associated with, you can find out how much space is in use by the WWW files for a domain with du -s /www/htdocs/domain If you don't have anything much in your home directory or mail spool, this comes close to the total space you have in use. (You would know if you did have other things in your home directory, and could use du -s $HOME to check on that.) If you have an anonymous FTP area, also check du -s ~ftp/my.domain For example, snoopy.com might need to run some number of the following: du -s /www/htdocs/snoopy du -s ~ftp/snoopy.com du -s $HOME and add the results to find out how much space he's using. You might find it useful to use the -c command and group the paths Example: brown:~$ du -sc /www/htdocs/pir ~ftp/pir.com $HOME 5489 /www/htdocs/pir 4 /www/ftp/pir.com 13 /home/rmiller 5510 total Actual results. brown:~$ du -sc /www/htdocs/pir ~ftp/pir.com $HOME 5489 /www/htdocs/pir du: /www/ftp/pir.com/bin: Permission denied du: /www/ftp/pir.com/dev: Permission denied du: /www/ftp/pir.com/etc: Permission denied du: /www/ftp/pir.com/lib: Permission denied 4 /www/ftp/pir.com 13 /home/rmiller 5510 total The numbers reported are kilobytes. A senior or RealAudio account gets to use about 51,000 blocks before having additional charges. A junior or telnet- only account gets about 5,100.

Email: support@supersoft-solutions.com
Phone: 1-860-644-4449

Copyright © 1997-2010
Read our Privacy Statement
Web Page Designs by J. Robert Nelli

Superior Software Solutions
88 Old Farm Road
South Windsor, CT 06074