Re: why is grep behaving this way ?

["Michael Marsh" <michael.a.marsh@gmail.com>]

On 3/2/07, Matus UHLAR - fantomas <uhlar@fantomas.sk> wrote:
> I'd say that logname detects logged user by checking terminal of stdin file
> handle...

Yup:

$ echo | strace -o'|grep readlink' logname
readlink("/proc/self/fd/0", "pipe:[5242235]", 511) = 14

$ strace -o'|grep readlink' logname
readlink("/proc/self/fd/0", "/dev/pts/7", 511) = 10

--
Michael A. Marsh
http://www.umiacs.umd.edu/~mmarsh
http://mamarsh.blogspot.com