Yet Another bourne shell query
Jeff Beadles
jeff at quark.WV.TEK.COM
Sat Sep 1 00:59:35 AEST 1990
jc at minya.UUCP (John Chambers) writes:
>I basically want to write something like:
> if [ <file 0 is open> ];then exec</dev/null;fi
>but I don't know what to put between the [ and the ]. Any ideas?
>Is it possible? Or should I just rewrite the scripts in C?
Well, from the test(1) man page...
-t [ fildes ]
True if the open file whose file descriptor number
is fildes (1 by default) is associated with a
terminal device.
This, you can tell if a file descriptor is attached to a terminal. (It will
fail for a pipe or redirection)
Thus, something like this might be what you are looking for:
if [ -t 0 ] ; then
exec </dev/null
fi
Best of luck,
-Jeff
--
Jeff Beadles jeff at quark.WV.TEK.COM
UTek Network Engineering, Tektronix Inc. +1 503 685 2568
SPEEA - Just say no.
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