[SOLVED] chmod

brownie_cookie · 05-24-2011, 04:48 AM

Hi all

A quick question

(just want to be sure)

I'm used to this type of command

Code:

# chmod 755 file

but numbers don't say much...
so, what does that 755 represent?

Code:

# chmod +x file

???

colucix · 05-24-2011, 04:53 AM

They are octal numbers. If you consider a triplet of permissions

Code:

rwx

they correspond to 4, 2, 1 respectively:

Code:

If you sum these values you obtain uniquely identified permission sets. For example, you have:

Code:

rwx = 4 + 2 + 1 = 7
r-x = 4 + 0 + 1 = 5
rw- = 4 + 2 +0 = 6

The chmod command requires this sum for each of the three triplets so that 755 is the same as

Code:

rwxr-xr-x
421401401
 7  5  5

Hope this helps.

brownie_cookie · 05-24-2011, 05:00 AM

wow

thanks !!!
it doesn't become more clearily than that ^^ !!