Do Some Basic UNIX: Difference between revisions
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</ul> | </ul> | ||
<font face="courier">chmod 700 <i>filename</i></font | <font face="courier">chmod 700 <i>filename</i></font> | ||
<ul> | <ul> | ||
<li type="1">owner read, write execute | <li type="1">owner read, write execute | ||
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e.g. <font face="verdana,arial">rm *</font> will remove all files from the current directory! | e.g. <font face="verdana,arial">rm *</font> will remove all files from the current directory! | ||
<b><font color="#FF0000" size="+1">You will absolutely never type 'rm *'. Ever.</font></b> | <b><font color="#FF0000" size="+1">You will absolutely never type 'rm *'. Ever.</font></b> | ||
<p><i>Always type something like</i><font face="verdana,arial"> "ls *" </font>first to verify what such a wildcard will match | <p><i>Always type something like</i><font face="verdana,arial"> "ls *" </font>first to verify what such a wildcard will match | ||
Revision as of 20:53, 11 September 2006
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.
|
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!
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 |