CHMOD is the Unix and Linux Command to change the rights, a user, group or all users have on a file. CHMOD is used in the following way chmod a+x file.txt. The a+x means add the right to eXecute to all users. Instead of a one can use u (change the right for the owner), g (change the rights for all users in the file s group), o (change the rights for all people not in the file s group). Instead of a + one can use a - , which removes permissions or an = which deletes all other permissions and only sets the new ones. Instead of the x you can use:

• r - for reading rights
• w - for writing rights
• Any one of the ugoa described earlier, to set the same permissions as definded to the users, group...
• t - to set the sticky bit
• s - to set the users who executes the application, when executed

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