Chmod
From MEPIS Documentation Wiki
The chmod command is used to change permissions of files and folders. For complete information, see the chmod man page (man chmod). chmod is a very flexible command in terms of syntax, so you'll see it used in a variety of ways. A few useful applications of chmod:
To remove all read/write/execute restrictions on a file:
chmod 777 filename
To make a file executable (needed for scripts that you've written or downloaded):
chmod +x filename
To make a program or script run with root priveleges regardless of who runs it (be careful!):
chmod +s filename
To lock down a file so only the owner can do anything to it:
chmod 700 filename
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