====== Chmod ======

====== chmod - change permissions on files ======
Note: This is only a Basic guide to chmod, covering some niche areas.
===== To see the current permissions on files and directories (folders):=====
 sburke@server:~$ ls -la
 
 -rwx---r-x   1 sburke users    1834 2006-09-07 17:48 .bashrc
 drwxr-xr-x   2 sburke users    4096 2006-10-21 17:08 public_html
 -rw-r--r--   1 sburke users      73 2006-09-28 12:03 .screenrc

===== The format of permissions are: =====
 -------user---------- ------group---------- ------world---------
 read, write, execute, read, write, execute, read, write, execute

===== Common Permissions are: =====
 chmod 000  <nowiki>//</nowiki>removes 
 chmod 400  <nowiki>//</nowiki>read permission to the user
 chmod 500  <nowiki>//</nowiki>read & execute permission to the user
 chmod 600  <nowiki>//</nowiki>read & write permission to the user
 chmod 700  <nowiki>//</nowiki>read & write & execute permission to the user.

So - mixing and matching the above numbers can give:
 chmod 644  <nowiki>//</nowiki>gives read&write to user, AND gives read to group and world.
 chmod 755  <nowiki>//</nowiki>gives read&write&execute to user, AND read&execute to group and world.

===== Make a Sticky Directory or File =====
A sticky file means that you can allow people to read and write to the file, however they cannot remove/delete the file. Similarly with a sticky directory: people can read, write and execute a directory and its contents, however they cannot remove the directory.
 chmod +t file
 chmod +t directory
 ls -la
 drwxrwxrwt
The /var/tmp has the sticky permission - so people can write inside the tmp directory, but they cannot remove the directory itself.

====== Quickly Search for 777 files and folders ======
The following quick and easy command will list all files and folders with permissions specified.
 find -perm 777
 find -perm 755

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More info:

http://www-128.ibm.com/developerworks/aix/library/au-speakingunix4/?ca=dgr-lnxw07UNIXpart4