Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

--level numbers

Specify by number the runlevels to change. Provide numbers as

a numeric string: e.g., 016 for levels 0, 1 and 6. Use this to

override specified defaults.

--list [service]

Print whether the specified service is on or off in each level. If

no service is specified, print runlevel information for all

services managed by chkconfig.

chmod

chmod [options] mode files

chmod [options] --reference=filename files

Change the access mode (permissions) of one or more files. Only

the owner of a file or a privileged user may change the mode. mode

can be numeric or an expression in the form of who opcode permis-

sion. who is optional (if omitted, default is a); choose only one

opcode. Multiple modes are separated by commas.

Options

-c, --changes

Print information about files that are changed.

-f, --silent, --quiet

Do not notify user of files that chmod cannot change.

--help

Print help message and then exit.

-R, --recursive

Traverse subdirectories recursively, applying changes.

--reference=filename

Change permissions to match those associated with filename.

-v, --verbose

Print information about each file, whether changed or not.

--version

Print version information and then exit.

Who

u User.

g Group.

o Other.

a All (default).

Opcode

+ Add permission.

- Remove permission.

= Assign