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Top Forums UNIX for Dummies Questions & Answers The professional way to use chmod ? Post 302960640 by omega3 on Wednesday 18th of November 2015 03:45:20 AM
Old 11-18-2015
The professional way to use chmod ?

Oracle Linux 6.4 with bash

Question from a beginner

To change permissions using chmod, I can use 2 methods. Since I don't know the terminology, I am calling them Method1 and Method2.
In the below example, both Method1 and Method2 do the same thing. Which one is you favourite method ?

# Giving execute privilege to the group

Method1.
Code:
$ touch file1.txt
	$
	$ ls -l file1.txt
	-rw-rw-r-- 1 ctms ctms 0 Nov 18 10:21 file1.txt
	$
	$ chmod g+x file1.txt

Method2.

Code:
$ touch file2.txt
	$
	$ ls -l file2.txt
	-rw-rw-r-- 1 ctms ctms 0 Nov 18 10:21 file2.txt
	$
	$ chmod 774 file2.txt
	$
	$ ls -l file2.txt
	-rwxrwxr-- 1 ctms ctms 0 Nov 18 10:21 file2.txt

 

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CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME
chmod - change access mode for files SYNOPSIS
chmod [-R] mode file ... OPTIONS
-R Change hierarchies recursively EXAMPLES
chmod 755 file # Owner: rwx Group: r-x Others: r-x chmod +x file1 file2 # Make file1 and file2 executable chmod a-w file # Make file read only chmod u+s file # Turn on SETUID for file chmod -R o+w dir # Allow writing for all files in dir DESCRIPTION
The given mode is applied to each file in the file list. If the -R flag is present, the files in a directory will be changed as well. The mode can be either absolute or symbolic. Absolute modes are given as an octal number that represents the new file mode. The mode bits are defined as follows: 4000 Set effective user id on execution to file's owner id 2000 Set effective group id on execution to file's group id 0400 file is readable by the owner of the file 0200 writeable by owner 0100 executable by owner 0070 same as above, for other users in the same group 0007 same as above, for all other users Symbolic modes modify the current file mode in a specified way. The form is: [who] op permissions { op permissions ...} {, [who] op ... } The possibilities for who are u, g, o, and a, standing for user, group, other and all, respectively. If who is omitted, a is assumed, but the current umask is used. The op can be +, -, or =; + turns on the given permissions, - turns them off; = sets the permissions exclu- sively for the given who. For example g=x sets the group permissions to --x. The possible permissions are r, w, x; which stand for read, write, and execute; s turns on the set effective user/group id bits. s only makes sense with u and g; o+s is harmless. SEE ALSO
ls(1), chmod(2). CHMOD(1)
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