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Quick Summary of Basic and Common Linux Commands
There are many commands that are used in linux on a daily basis, ones that everyone should know just to get by. Like back in the days of DOS, you had to know how to work with the command line and how to navigate around. Learning new commands is always hard, especially when there are so many new ones that don't always seem to make sense in their names. cd Change directory - this command is essential for traversing folders and moving about your linux computer. Its quite straight forward, cd /where/you/want/togo or cd .. to go up a level. It's pretty basic, but be aware of absolute and relative paths. If you are currently in the folder /home/puppy/pictures then you can type cd .. to move up to /home/puppy/ or you could type cd /home/puppy/ not to mention cd ~/puppy/. You must learn how to traverse folders effectively before you can use the operating system. ls The ls command gives you a directory listing. This command has many options, but basically provides you with the same information as the "dir" command in DOS. The most common use of ls is probably "ls -la" infact many people have an alias setup, so whenever they type "ls" it actually runs "ls -la". du The disk usage command gives you a summary of how much space a program or some piece of data is using. Normally this command uses the -h feature, which simply means it will tell you if the number it gives you is in bytes, kilobytes, etc. -h gives you the human readable output. mv Move! The mv command is the move command, but it is far more powerful than the old DOS commands. You must be very careful when using the mv command, if you tell it to move a program to a new location, it will overwrite the stuff that was there, if the same file name exists. In addition the mv command is also the rename command! If I type: mv file1 file2 I just moved or effectively renamed file1 to file2! date The date command displays the current date and time of your server to the screen, and can be formatted in many ways, but date by itself will display something similar to: Sat Apr 30 23:58:41 EDT 2005 cp The copy command is a great program, and is very powerful. Often used with the -R (recursive) option, it can be used to copy single files, or entire paths around with ease. rmdir Remove directory is a command that I personally don't use very often. To remove a directory it must be empty, rarely do I take the time to empty a directory before I delete it. Instead I use a variation of the rm command. rm This is the mother of all linux commands. Remove. You must always be very careful when you use this program. There aren't too many options with this program, its quite straight forward, you use it to delete things. -R is recursive and -f is force. If you want to clear a big folder and you are 100% sure you want it gone in a hurry, type: rm -Rf /directoryname chgrp Change group - this command is used to change the group ownership on a file. For the most part this is more of an administrative thing, and end users don't typically have to worry too often about this. You must know about the design of the linux file system before you worry about the chgrp command. chown Change owner - this command very similar to the chgrp command, and changes the owner instead of the group. Again you must really understand the design of the linux file system before this becomes really important. File ownership is an important part of security and permissions in linux. mkdir Make directory - this is a very straight forward command in linux, easy to use, just mkdir newfoldername vi This is a text editor in linux, its extremely powerful, but not exactly user friendly. I highly suggest that you take the time to learn this program, or at least the most common features. If you want to play with this program, you might get stuck inside it, remember these words. Escape, Colon, q, ! ( escape key, :q! ) That gets you out of interactive or insert mode, then gets you to the menu, then quit without saving! su Switch user - the su command lets you login from your account to another account. If you are root, you can type su - username and jump to any account without a password. If you are a normal user account and want to go to root then type su - root. If you do not put the hyphen then you will not use that users environment. Generally if you are logging in as a user it's a good idea to be in their working environment! pwd Print working directory - this command gives you the current directory you are working in. $ pwd - me running command /home/username/my_pics - this is the output from that command As I mentioned earlier, there are so many different commands to learn, it really just takes time and effort to play with them and learn their options. The manual (MAN) pages in linux are really great and full of information. Many of the most common commands are located in the /bin folder, check it out! Ken Dennis http://KenDennis-RSS.homeip.net/
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