Re: why is grep behaving this way ?

[Håkon Alstadheim <hakon@alstadheim.priv.no>]

Salvatore Iovene wrote:
> On Fri, Mar 02, 2007 at 03:07:37PM +0530, Bhasker C V wrote:
>   
>> [bhaskerv@cvsrep01 ~]$ who | grep `logname`
>> logname: no login name
>> Usage: grep [OPTION]... PATTERN [FILE]...
>> Try `grep --help' for more information.
>>     
>
> Weird. Consiedering that this works:
>
> who | grep `whoami`
>
> Where's the catch?
>
>   
I'm running SuSE, and can reproduce the problem here. Seems logname does
something weird when stdin is not your tty. Check this out:

hakon@armada~:0$ logname</dev/null
logname: no login name

My manual-page has nothing to say. Try looking at the source if you must.

-- 
Håkon Alstadheim 
spamtrap: finnesikke@alstadheim.priv.no -- 1 hit & you are out