Extreme Beginner Post: 302916002

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Special Forums UNIX Desktop Questions & Answers Extreme Beginner Post 302916002 by jim mcnamara on Friday 5th of September 2014 04:41:03 PM

09-05-2014

Registered User

Example first column of ls -l

Code:

File type: d== directory l== link
|
|
|
|
|
_
drwxrwxr-x
 ___   ___
  | ___ |
  |  |  |
  |  |  (World) other permissions  r,w,x, and -
  |  group permissions r,w,x, and -
  owner permissions: r == read, w== write, x ==execute  - == permission denied

Permission bits can also be written as octal numbers.

Code:

0 (no permission)
1 execute
2 write
3 execute + write
4 read
5 read + execute
6 read + write
7 read + write + execute

So 755 is
owner read, write, execute
group read, execute
other read, execute

Last edited by jim mcnamara; 09-05-2014 at 05:46 PM..

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LEARN ABOUT PLAN9

chmod

CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME

       chmod - change mode

SYNOPSIS

       chmod mode file ...

DESCRIPTION

       The  mode  of each named file is changed according to mode, which may be an octal number or a symbolic change to the existing mode.  A mode
       is an octal number constructed from the OR of the following modes.

       0400   read by owner

       0200   write by owner

       0100   execute (search in directory) by owner

       0070   read, write, execute (search) by group

       0007   read, write, execute (search) by others

       A symbolic mode has the form:

	      [who] op permission

       The who part is a combination of the letters u (for user's permissions), g (group) and o (other).  The letter a stands for ugo.	If who	is
       omitted, the default is a.

       Op  can be + to add permission to the file's mode, - to take away permission, and = to assign permission absolutely (all other bits will be
       reset).

       Permission is any combination of the letters r (read), w (write), x (execute), a (append only), and l (exclusive access).

       Only the owner of a file or the group leader of its group may change the file's mode.

SOURCE

       /sys/src/cmd/chmod.c

SEE ALSO

       ls(1), stat(2), stat(5)

																	  CHMOD(1)

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chmod