chmod (change permissions)Changes the permissions of one or more files. Can specify permissions using codes or numbers.Codes: u (owner),g (group),o (other),a (all);+ (add to current permissions),- (subtract from current permissions),= (replace current permissions);r (read),w (write), x (execute).Numbers: 1= execute, 2 = write,4 = readFormat: chmod modep filenames Examples: chmod a+x file7 chmod 754 file8 file9 Example 1 : Gives owner, group, and everyone execute permission on file7. See Chapter 9.Example 2 : Gives read, write, and execute permission to user; gives read and execute permission to group; gives read permission to everyone. The mode is determined by adding the permission numbers for each category separately; e.g., 1(execute)+2(write)+4(read)=7.Only the owner of the file or the super user can change the group.
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