[SOLVED] Change "rwxr-xr-x" to "755"

pingu · 05-18-2011, 07:33 AM

What I want to do is write a small bash-script that reads a directory-structure on serverA so I then can create an identical structure on serverB, including ownership & permission.
I do not want to simply copy everything it is far too much so no files, only directories.

What I have now is:

Code:

find /home/pingu/test/Cert -type d -ls |awk '{ print $3 " " $5" " $6" " $11}'> mydir
sed -i  s/.// mydir

Prints out

Code:

rwxr-xr-x pingu users /home/pingu/test/Cert
rwxr-xr-x pingu users /home/pingu/test/Cert/Dokument

To then read this file "mydir" into an array and create the directories with correct owner&group is a piece of cake (I believe w/o having tried yet...)
Problem: To set permissions I need to use numbers. So how do I change that "rwx.."-style to numbers ("755")? Please note: the permissions vary a lot in the real directories, I can't just set "750" have to be very careful to get correct permissions.
cp, ls, tar, find... - none of them has built-in options that does what I want, have searched docs & manpages, tried a lot of combinations but to no avail.
Any suggestions?

EricTRA · 05-18-2011, 07:44 AM

Hello,

I don't quite understand what you need exactly. You state your problem is that you need to use numbers to set permissions? That's not correct, you can also use r w x like this:

Code:

chmod u+rwx file
chmod g+rwx file
chmod a+rwx file
chmod uga+rwx file

and all other possible combinations, where

Code:

u = change permission on user level
g = change permission on group level
a = change permission on all level (world)
+ = add permission
- = remove permission
r = read
w = write
x = execute

Maybe I'm misunderstanding you and you need something else. Can you clarify what you exactly want to do? That way it be easier to provide perhaps a more dedicated answer.

Kind regards,

Eric

knudfl · 05-18-2011, 07:49 AM

Quote:

Change "rwxr-xr-x" to "755"

"rwxr-xr-x" is actually "755" , isn't it ? ?

grail · 05-18-2011, 07:57 AM

I think this may be what he is after:

Code:

#!/bin/bash

while read -r DIR
do
    stat -c"%a %U %G %n" "$DIR" >> mydir
done< <(find /home/pingu/test/Cert -type d)

Of course you could probably perform the mkdir in the script as well assuming you have access to serverB.

catkin · 05-18-2011, 08:13 AM

This bash scrippet converts rwxr-xr-- style strings to numbers:

Code:

#!/bin/bash

buf=$1
numbers_str=
for (( i = 0; i < 3; i++ ))
do
    number=0
    letters=${buf:$(( i * 3 )):3}
    case $letters in
        *r* )
            (( number += 4 ))
            ;;&
        *w* )
            (( number += 2 ))
            ;;&
        *x* )
            (( number += 1 ))
            ;;&
    esac
    number_str=$number_str$number
done
echo $number_str

Other letters are possible in ls output; are you sure the directories only have some combination of r, w, x and -?

Chirel · 05-18-2011, 08:32 AM

Hi,

I really don't get it.

Why don't you use the rsync command ?

Code:

rsync -av --include='*/' --exclude='*' source destination

catkin · 05-18-2011, 08:51 AM

Quote:

Originally Posted by Chirel

Hi,

I really don't get it.

Why don't you use the rsync command ?

Code:

rsync -av --include='*/' --exclude='*' source destination

That's good

pingu · 05-20-2011, 03:50 AM

Chirel, that was awsome!
Can't believe I spent so many hours resolving this and then it turns out to be that easy!

Thanks to all you others too, especially Catkin & Grail who gave me examples of those scripts I've tried desperately to write. Will read them carefully, I still have a lot to learn!

Thanks all!