Do Some Basic UNIX: Difference between revisions
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<h2>Some basic unix commands</h2> | <h2>Some basic unix commands</h2> | ||
<h3>Want more? Try the excellent tutorials at | |||
[http://freeengineer.org/learnUNIXin10minutes.html FreeEngineer.org], | |||
[http://www.mayo.edu/bir/bir/tutor.html Mayo], | |||
[http://www.unixgeeks.org/security/newbie/unix/ UnixGeeks.org] or | |||
[http://www.isu.edu/departments/comcom/unix/workshop/unixindex.html Idaho state] | |||
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Revision as of 00:25, 9 September 2006
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Some basic unix commands
Want more? Try the excellent tutorials at FreeEngineer.org, Mayo, UnixGeeks.org or Idaho state
| Command | Meaning |
|---|---|
| man function | show the manual page for a function |
| top | shows currently running processes - do not leave this running for more than 30sec (ctrl-c) |
| ps | show the names of all running processes |
| mkdir dir_name | create a sub-directory of the current directory |
| rmdir dir_name | remove a directory. You must remove files in the directory first. |
| cp source dest | copy a file or directory from source to dest |
| rm file_name | remove a file (permanent!) |
| chmod xxx file_name | change the file permissions:
Three numbers indicate the permissions for the owner, the group and the world.
You can add these permissions together, for example:
chmod 777 filename
chmod 744 filename
chmod 755 filename
chmod 700 filename
chmod -R will make these changes to all of the files in any sub-directories, as well. |
| ls | list contents of current directory |
| ls -l | list the contents of the directory (long form, showing sizes) |
| ls dir_name | list the contents of the named directory |
| cd dir_name | change to the named directory |
| pwd | show the name of the current directory |
| . | the current directory |
| .. | the parent directory of this directory |
| more file_name | print out the contents of the named (text) file |
| df | show the free space on the present disk |
| du | show the disk usage on the system |
| * | unix wild card - matches all file names (except those beginning with '.')
e.g. rm * will remove all files from the current directory! <blink>You will absolutely never type 'rm *'. Ever.</blink> Always type something like "ls *" first to verify what such a wildcard will match |
| xemacs file_name textedit file_name |
These are all text editors that are found commonly on unix systems. Most people seem to prefer xemacs, but each has its adherents. |
| ? | matches any single character |