What is: chmod a+rwx,+t

[Manuales]

Hi ..
what is the meaning of:

chmod a+rwx,+t

please, tell me as follows:

rwx-rwx-rwx or rw-rw-rw ... what ever.

Thanks...

[Jeff Schussele · Accepted solution]

Hi,

It sets read/write/executable for *all* users as well as setting the save-text-image-on-file-execution permission - otherwise known as "sticky-bit".
This allows faster re-execution of frequently run commands.

HTH,
Jeff

[Zinky]

It means the filesystem will be world writable/redable but with sticky bit on.

Only the file/dir owners will be able to modify, overwrite or delete the files.

[Pete Randall]

The t sets the sticky bit, which does not show up in the permissions:

$ mkdir sticky
$ ll -d sticky
drwxrwxr-x 2 plr support 96 Mar 1 10:32 sticky
$ chmod u-t sticky
$ ll -d sticky
drwxrwxr-x 2 plr support 96 Mar 1 10:32 sticky

From the man page for chmod:

"If the sticky bit is set on a directory, files inside the directory may be renamed or removed only by the owner of the file, the owner of the directory, or the superuser (even if the modes of the directory would otherwise allow such an operation).


Pete

[Arunvijai_4]

Hi Manuales,

+t stands for "Sticky bit". You can find more information about "sticky bit" here,

http://www.faqs.org/faqs/hp/hpux-faq/section-70.html

-Arun

[Kent Ostby]

$ chmod 000 useme
$ ll useme
---------- 1 kmo users 0 Mar 1 10:34 useme
$ chmod a+rwx,+t useme
$ ll useme
-rwxrwxrwx 1 kmo users 0 Mar 1 10:34 useme*
atasw01:home/kmo $

[Peter Godron]

Manuales,
from man chmod:
" Add or delete the save-text-image-on-file-
execution (sticky bit) permission."

[James R. Ferguson]

Hi Manuales:

The manpages for 'chmod(1)' tell you the answer.

The "a" says to set the permissions or +rwx (read, write, execute) for *a*ll or for the owner, group and world. The 't' sets the so-called "sticky-bit".

If the sticky bit is set for a directory, then the directory's files can only be renamed or removed by the owner of the file, the owner of the directory, or by root.

If the sticky bit is set for an executable file, then the text (code) of the executable remains in memory for subsequent executions. This may make process startup for the executable faster.

Regards!

...JRF...

[Manuales]

and ...
what is chmod u+s ??

and chmod o-rwx ?

[Geoff Wild]

chmod u+s - Add the set-owner-ID-on-file- execution

chmod o-rwx - take away read/write/execute for others (world).

man chmod will give you all of this. :)

Rgds...Geoff

[Arunvijai_4]

Hello,

and ...
what is chmod u+s ??

Set UID, A good reading

http://catcode.com/teachmod/setuid.html

and chmod o-rwx ?

It takes out all permissions from Others.
http://grouchy.cs.indiana.edu/usr/local/www/linux/gs/subsection2.6.14.4.html

-Arun

[Manuales]

THANKS ALL .....

:0)

Manuales.