From owner-freebsd-questions  Wed Nov 10  9: 5:37 1999
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	Wed, 10 Nov 1999 10:08:49 -0800
Date: Wed, 10 Nov 1999 10:08:49 -0800 (PST)
From: <keith@mail.telestream.com>
To: Michael Kennett <mike@laurasia.com.au>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Testing file permissions
In-Reply-To: <199911101704.BAA05709@laurasia.com.au>
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You can just test the file attributes...

-d  file exists and is a directory
-e  file exists
-f  file exists and is a regular file
-r  you have read permissions on the file
-s  file exists and is not empy
-w  You have write permisions on the file
-x  You have execute permissions on the file
-O  You own the file
-G  Files group IS matches yours


On Thu, 11 Nov 1999, Michael Kennett wrote:

> Hello All,
> 
> How do I test the permissions of a file in a script?
> 
> I'm making some changes to the daily admin scripts, and I'd like to test
> the permissions and ownership of a couple of files and directories. The
> only way I can do it is to use the `ls -l' command and to process the text
> output.
> 
> e.g. To test that the /bin/ls command is world executable (trivial example):
> 
>   if [ -f /bin/ls ] && ( ls -l /bin/ls | cut -b 4 | grep x > /dev/null )
>   then
>     echo "World Executable"
>   fi
> 
> This seems *rather* crude!
> 
> An alternative approach (just thought of it!) would be to use the 'find'
> command:
> 
>   if find /bin -name ls -perm -400 | grep ls > /dev/null
>   then
>     echo "World Executable"
>   fi
> 
> But this is equally crude -- indeed, I feel like I'm smashing the problem
> with the biggest sledgehammer that I can find!
> 
> Is there another way of doing this test of file permissions?
> Similarly, is there a quick test for checking the ownership of a file?
> 
> Regards,
> 
> Mike Kennett
> (mike@laurasia.com.au)
> 
> 
> 
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