Prev: sed -f
Next: bash printing variable with newlines
From: Rakesh Sharma on 26 Mar 2010 15:02
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
From: pk on 26 Mar 2010 15:07
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

From: mop2 on 26 Mar 2010 15:32
On Fri, 26 Mar 2010 16:02:10 -0300, Rakesh Sharma
<sharma__r(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
$
From: Jon LaBadie on 26 Mar 2010 15:49
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.

From: Seebs on 26 Mar 2010 16:43
On 2010-03-26, Rakesh Sharma <sharma__r(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-nospam(a)seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
 |  Next  |  Last
Pages: 1 2
Prev: sed -f
Next: bash printing variable with newlines