$ var="$(cat bah 3>&1 1>&2 2>&3)"
$ echo $var
cat: bah: No such file or directory
On Tue, Mar 15, 2011 at 12:54 AM, der.hans
<PLUGd@lufthans.com> wrote:
Am 14. Mar, 2011 schwätzte Bryan O'Neal so:
moin moin,
Ok - if I want to direct stranded out, standard error, or both to a
Gotta love stranded out :).
file I can do that. If I want to redirect standard out to a variable
for latter use, I can do that. But how do I redirect standard error to
a variable?
If all else fails, you can redirect STDERR to STDOUT, '2>&1'.
If you control whatever's giving the errors you can have it set variables
that are used later.
As to capturing both to variables without using a temporary file, see the
bottom of the following page.
http://mywiki.wooledge.org/BashFAQ/002
If you can do everything you need for one of them in a subshell, then it
is possible.
( exec 3>&1; fred=$( { output=$( ls -d /tmp /ztmp 2>&1 1>&3- ); } 3>&1;
echo "{$output}" | sed -re 's,/ztmp (.+),/zztop \1,'; ); echo "<$fred>"
( exec 3>&1; fred=$( { output=$( ls -d /tmp /ztmp 2>&1 1>&3- ); } 3>&1;
echo "{$output}" | sed -re 's,/ztmp (.+),/zztop \1,' >&2; ); echo
"<$fred>" )
{ls: Zugriff auf /zztop nicht möglich: Datei oder Verzeichnis nicht gefunden}
</tmp>
The sed is just to show that I'm mangling the STDERR output once it's been
tossed into a variable.
Since $output is in a subshell you can't get to it from the normal shell,
but you could call a fx() to handle the data.
( mungestderr() { echo "{$output}" | sed -re 's,/ztmp (.+),/zztop \1,'; };
exec 3>&1; fred=$( { output=$( ls -d /tmp /ztmp 2>&1 1>&3- ); } 3>&1;
mungestderr "$output" ); echo "<$fred>" )
</tmp
{ls: Zugriff auf /zztop nicht möglich: Datei oder Verzeichnis nicht gefunden}>
( mungestderr() { echo "{$output}" | sed -re 's,/ztmp (.+),/zztop \1,' >&2; }; exec 3>&1; fred=$( { output=$( ls -d /tmp /ztmp 2>&1 1>&3- ); } >3>&1; mungestderr "$output" ); echo "<$fred>" )
{ls: Zugriff auf /zztop nicht möglich: Datei oder Verzeichnis nicht gefunden}
</tmp>
To keep it clear you might just want to toss it into a file or named pipe.
ciao,
der.hans
--
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# ABLEconf - 2011Apr02 - Free Software for Free Enterprise
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