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Date: Fri, 09 May 2003 15:27:03 -0700
To: cygwin AT cygwin DOT com
From: Randall R Schulz <rschulz AT sonic DOT net>
Subject: RE: How to "find" all writable files in a directory tree?
In-Reply-To: <Pine.LNX.4.53.0305091806190.21240@nautilus.m8y.org>
References: <5 DOT 2 DOT 1 DOT 1 DOT 2 DOT 20030509150109 DOT 0658b200 AT pop DOT sonic DOT net>
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 <EBEMJMPFEOOPGHBJFKGPKEAPFBAA DOT winston DOT gutkowski AT eztext DOT com>
 <5 DOT 2 DOT 1 DOT 1 DOT 2 DOT 20030509150109 DOT 0658b200 AT pop DOT sonic DOT net>
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AC,

At 15:08 2003-05-09, lists AT m8y DOT org wrote:
>On Fri, 9 May 2003, Randall R Schulz wrote:
>
> > At 14:44 2003-05-09, lists AT m8y DOT org wrote:
> > >-perm +222 is redundant
> >
> > How do you figure? There are 8 combinations of write enable bits that
> > this permission specification matches. For "-perm +2" only one bit is
> > examined and there's only one way for it to succeed.
>
>My reading of the manual is that:
>-222 examines bit 2 being on in all of the 3 areas
>+2 examines bit 2 being on in all of the 3 areas
>222 checks exact permissions 222

Well I can see no interpretation of the manual that supports what you're saying

So... We resort to empiricism...

-==--==--==-setup-==--==--==-
touch 000; chmod 000  000
touch 002; chmod 002  002
touch 020; chmod 020  020
touch 022; chmod 022  022
touch 200; chmod 200  200
touch 202; chmod 202  202
touch 220; chmod 220  220
touch 222; chmod 222  222
-==--==--==-setup-==--==--==-


-==--==--==-find-test-==--==--==-
set -x
find . -type f -perm +000
find . -type f -perm +002
find . -type f -perm +020
find . -type f -perm +022
find . -type f -perm +200
find . -type f -perm +202
find . -type f -perm +220
find . -type f -perm +222
-==--==--==-find-test-==--==--==-

% setup
% ls -lF
total 2
----------    1 RSchulz  None            0 May  9 15:20 000
--------w-    1 RSchulz  None            0 May  9 15:20 002
-----w----    1 RSchulz  None            0 May  9 15:20 020
-----w--w-    1 RSchulz  None            0 May  9 15:20 022
--w-------    1 RSchulz  None            0 May  9 15:20 200
--w-----w-    1 RSchulz  None            0 May  9 15:20 202
--w--w----    1 RSchulz  None            0 May  9 15:20 220
--w--w--w-    1 RSchulz  None            0 May  9 15:20 222
-rwxrwxr-x    1 RSchulz  None          227 May  9 15:22 find-test*
-rwxrwxr-x    1 RSchulz  None          220 May  9 15:20 setup*

% find-test
+ find . -type f -perm +000
+ find . -type f -perm +002
./002
./022
./202
./222
+ find . -type f -perm +020
./020
./022
./220
./222
./find-test
./setup
+ find . -type f -perm +022
./002
./020
./022
./202
./220
./222
./find-test
./setup
+ find . -type f -perm +200
./.find-test.swp
./200
./202
./220
./222
./find-test
./setup
+ find . -type f -perm +202
./.find-test.swp
./002
./022
./200
./202
./220
./222
./find-test
./setup
+ find . -type f -perm +220
./.find-test.swp
./020
./022
./200
./202
./220
./222
./find-test
./setup
+ find . -type f -perm +222
./.find-test.swp
./002
./020
./022
./200
./202
./220
./222
./find-test
./setup


OK?

Randall Schulz 


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