Chmod
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From Linuxconfig.org
Name
chmod - change file access permissions
Synopsis - man page
chmod [OPTION]... MODE[,MODE]... FILE... chmod [OPTION]... OCTAL-MODE FILE... chmod [OPTION]... --reference=RFILE FILE...
Frequently used options
-R, --recursive
change files and directories recursively
-c, --changes
like verbose but report only when a change is made
-v, --verbose
output a diagnostic for every file processed
Basics
- r : read (user can read the file, or list a given directory)
- w : write (user can write to the file, or create file or directory in the directory)
- x : execute (user can execute the file, or enter directory)
$ ls -ld dir/
Examples
Octal Mode
Lets see how we can change file.txt permissions to rwxr-xr-- with octal mode:
$ chmod 764 file.txt
Symbolic Specification
Lets see how we can change file.txt permissions to rwxr-xr-- with symbolic specification:
$ chmod u=rwx,g=rx,o=r file.txt
