Make stderr -> stdout & stdout -> /dev/null
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From: Rakesh Sharma on 27 Mar 2010 00:57 On Mar 27, 12:07 am, pk <p...(a)pk.invalid> wrote: > Rakesh Sharma wrote: > > How do I make the STDERR go to STDOUT whilst nullifying the STDOUT > > from > > any command? > > > This doesn't work: > > command 3>&1 1>&2 2>&3 3> /dev/null > > This should do it: > > command 2>&1 1>/dev/null Thanks for the concise answer. It so completely translates with the problem statement! -- Rakesh
From: Rakesh Sharma on 27 Mar 2010 01:00 On Mar 27, 12:32 am, mop2 <inva...(a)mail.address> wrote: > On Fri, 26 Mar 2010 16:02:10 -0300, Rakesh Sharma > > > > <sharma...(a)hotmail.com> wrote: > > How do I make the STDERR go to STDOUT whilst nullifying the STDOUT > > from > > any command? > > > This doesn't work: > > command 3>&1 1>&2 2>&3 3> /dev/null > > > I am going thru this rigamarole as I want to test for the > > existence of > > a file in a portable manner. > > test -e is not available on Solaris. > > > So I am doing this: > > status=`/bin/ls -d -- "filename" 3>&1 1>&2 2>&3` > > case $status in > > '' ) echo 'filename EXISTS';; > > *) >&2 echo "filename doesnt EXIST: $status";; > > esac > > > -- Rakesh > > Sorry, I dont know if this is portable. > Here, with bash4 is ok: > > $ ls -ld /tmp /tmpppp 2>/dev/null >&2 > $ Would it not consign both (STDERR and STDOUT) to /dev/null? Actually, that's not what I wanted. STDERR should go to where STDOUT normally goes & the STDOUT should be dumped in /dev/null. -- Thanks, Rakesh
From: Rakesh Sharma on 27 Mar 2010 01:01 On Mar 27, 12:49 am, Jon LaBadie <jlaba...(a)aXcXm.org> wrote: > Rakesh Sharma wrote: > > How do I make the STDERR go to STDOUT whilst nullifying the STDOUT > > from > > any command? > > > This doesn't work: > > command 3>&1 1>&2 2>&3 3> /dev/null > > > I am going thru this rigamarole as I want to test for the existence of > > a file in a portable manner. > > test -e is not available on Solaris. > > Which Solaris? Which shell? Are you locked into /bin/sh? > > What about /bin/test for this one test. My Solaris 9 > /bin/test has the -e option. Solaris 5.8. /bin/sh on Solaris Not sure if I have Solaris 9 installed with us. Thanks -- Rakesh
From: Rakesh Sharma on 27 Mar 2010 01:03
On Mar 27, 1:43 am, Seebs <usenet-nos...(a)seebs.net> wrote: > On 2010-03-26, Rakesh Sharma <sharma...(a)hotmail.com> wrote: > > > How do I make the STDERR go to STDOUT whilst nullifying the STDOUT > > from > > any command? > > Typically, 2>&1 1>/dev/null > > Note that this doesn't work for pipes; "2>&1 | foo" ends up opening > the pipe, then redirecting stderr to stdout. > > > I am going thru this rigamarole as I want to test for the existence of > > a file in a portable manner. > > Hmm. > > > test -e is not available on Solaris. > > How about "test -f"? If you're sure it's a plain file, that'll probably > be a lot easier. > > -s > -- > Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nos...(a)seebs.nethttp://www.seebs.net/log/<-- lawsuits, religion, and funny pictureshttp://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated! Thanks for the suggestion. test -f will not work as file maybe anything: plain file/non-plain file/directory/link/etc. -- Rakesh |