Linux "chmod" Command Line Options and Examples

change permissions of a file

This manual page documents the GNU version of chmod. chmod changes the file mode bits of each given file according to mode, which can be either a symbolic representation of changes to make, or an octal number representing the bit pattern for the new mode bits. The format of a symbolic mode is [ugoa.

Usage:

chmod [OPTION]... MODE[,MODE]... FILE... chmod [OPTION]... OCTAL-MODE FILE... chmod [OPTION]... --reference=RFILE FILE...

Command Line Options:

-c

like verbose but report only when a change is made


                            chmod -c ...

-f

suppress most error messages


                            chmod -f ...

-v

output a diagnostic for every file processed


                            chmod -v ...

--no-preserve-root

do not treat '/' specially (the default)


                            chmod --no-preserve-root ...

--preserve-root

fail to operate recursively on '/'


                            chmod --preserve-root ...

--reference

use RFILE's mode instead of MODE values


                            chmod --reference ...

-R

change files and directories recursively


                            chmod -R ...

--help

display this help and exit


                            chmod --help ...

--version

output version information and exitEach MODE is of the form '[ugoa]*([-+=]([rwxXst]*|[ugo]))+|[-+=][0-7]+'.AUTHORWritten by David MacKenzie and Jim Meyering.REPORTING BUGSGNU coreutils online help: <http://www.gnu.org/software/coreutils/>Report chmod translation bugs to <http://translationproject.org/team/>COPYRIGHTCopyright © 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


                            chmod --version ...