CHMOD Commands

Chmod command sets UNIX file permissions.
You can set the permissions with the help of your FTP client.

What is CHMOD?

Short for change mode, chmod is a command that changes the access
permissions of files or directories in order to read, write or execute
files. The mode number consists of three octal digits, representing the
access allowed for yourself, for your group (other users set-up on your
account), and for everyone else. The value of each digit represents the
type of access that is allowed.

4 – ability to read the file
– ability to write the file
1 – ability to execute the file

you wanted to represent the ability to read and write, you would add 4 and
2 together. For example, if you had a Perl script for your website, you
might make the mode 755 so that you could read/write/execute (4 + 2 + 1 =
7) the file, whilst other users could only read/execute (4 + 1 = 5) the
file. You may give a standard HMTL file, the mode 644 so that you can read
and write to it, whilst others can only read it. You would usually make a
directory executable, so a directory that others can read would have a
mode of 755.

How do I CHMOD using my FTP client?

width=230 align=right>Using the WS_FTP program, connect to your site and
enter the directory containing the script you need to CHMOD. Right click
the file or folder in question and select ‘chmod (UNIX)’ from the menu.
The ‘Remote File Permissions’ window will open and allow you to alter the
file permissions. (Note: ‘CHMOD’ is listed under ‘FTP Commands’ in WS_FTP
version 7+)

This procedure may vary between FTP clients. Please
refer to the relevant manual for details. Your chosen FTP programme may
not have a CHMOD feature. In this case, look for a feature where you can
type a command directly to the FTP server. You can then type your command
in the format of ‘site chmod 755’, where the mode of is
changed to 755.

How do I CHMOD using Dreamweaver?

CHMOD Using Dreamweaver
width=230 align=right>Once you have uploaded your files using the site
manager, enter the directory (in the remote site window) that contains the
file you wish to chmod. Open the ‘Site FTP Log’ window from the ‘Window’
menu. At the ‘FTP Command’ prompt, type ‘site chmod 755’. This
would change the mode of to 755.



U?? G?? E

rwx rwx rwx? chmod 777 filename
rwx rwx r-x? chmod 775 filename
rwx r-x r-x chmod 755 filename
rw- rw- r–? chmod 664 filename
rw- r– r- chmod 644 filename
U =
G = Group
E = Everyone
r =
w = writable
x = executable
= no permission

3. Performing chmod with FTP client program

When you set permissions in a FTP client, you are usually presented with
a more intuitive and clear interface by right clicking the folder or file. You can easily see
what permissions are set for owner/group/others. Here is an example of the

In this example you see both table of the permission assignments, octal
numeric value (“644” in the example) and the text value (“-rw-r-r”
in the example). To set permissions in the FTP client, you usually select a
group of files, and then either click a button, or a menu item. No need to type file names by hand or brainstorm an octal value to supply to chmod command.

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