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brownie_cookie 05-24-2011 04:48 AM
chmod
 
Hi all

A quick question :p (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:
421
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 :D thanks !!!
it doesn't become more clearily than that ^^ !!


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