UNIX:Chmod Calculator

Unix File Permission in Details - chmod Calculator:

This post will give you complete details about Unix file permission. chmod calculator help you to find out the numbers to execute chmod commands.

CHMOD:

Chmod stands for Change Mode and is a command often needed for installing scripts (CGI, PHP etc.) on a UNIX server, after uploading the file (with FTP) you may need to change the permissions. Basically it tells the server who can make what changes to the file or folder, i.e. can the script only read the info, or can it write information as into it as well.

CHMOD CALCULATOR:

Some FTP programs give you something that looks like this to set chmod permissions.
This may help you try it out first and find out if you really are setting the right permissions.

Symbolic Notation	Octal Notation	Description
----------	000	no permissions
---x--x--x	111	execute
--w--w--w-	222	write
--wx-wx-wx	333	write & execute
-r--r--r--	444	read
-r-xr-xr-x	555	read & execute
-rw-rw-rw-	666	read & write
-rwxrwxrwx	777	read, write, & execute

Legend:

CODE	DESCRIPTION
1	execute
2	write
3	write & execute
4	Read
5	Read & execute
6	Read and Write, no execute
7	Full Access

First one is Owner, Second is Group and third is others.

Common ones:

PERMISSION	COMMAND
rwxrwxrwx	chmod 777 filename
rwxrwxr-x	chmod 775 filename
rwxr-xr-x	chmod 755 filename
rw-rw-rw-	chmod 666 filename
rw-rw-r--	chmod 664 filename
rw-r--r--	chmod 644 filename

WHAT DO THE CHMOD SETTINGS MEAN?

Chmod tells the server the access privileges for a file. For example, common file settings are:
777: all can read(4) / write(2) / execute(1) the file.
755: owner can do all, group / others can read / execute.
644: owner can read / write, group / others can read only.

COMMON CHMOD SETTINGS

•user-group-other read/write permissions

•-rw-r--r--  1 DYADAV  dstage  164870 27 Feb 17:58 a.txt