sending the STDOUT and the STDERR to programs in the shell
Sending the STDOUT and the STDERR to programs.
I can do:
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"'
perl -e 'print "aaa\n"; warn "bbb\n"' 2| perl -ne 'print "** $_"'
but I can't do bout:
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"' 2| perl -ne 'print "** $_"'
Notice that the important part of the question is:
How to use the | and 2| in the some command line?
I can do:
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"'
perl -e 'print "aaa\n"; warn "bbb\n"' 2| perl -ne 'print "** $_"'
but I can't do bout:
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"' 2| perl -ne 'print "** $_"'
Notice that the important part of the question is:
How to use the | and 2| in the some command line?
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Guy Hengel [angelIII / a3]
http://www.perl.com/doc/FAQs/FAQ/oldfaq-html/Q5.15.html
ASKER
This isn't a perl question.
the question is:
How to use the | and 2| in the some command line?
Or better, I need the STDOUT to go to one process and the STDERR to another. The perl in this example is just because I'm used to use it, but I can't do it in this project. Just C, the real old C.
the question is:
How to use the | and 2| in the some command line?
Or better, I need the STDOUT to go to one process and the STDERR to another. The perl in this example is just because I'm used to use it, but I can't do it in this project. Just C, the real old C.
I see.
in the shell as such, you need to use the 2&>1 to get the stderr redirected to the stdout.
as I don't use unix alot, I am not sure where to put that:
perl -e 'print "aaa\n"; warn "bbb\n"' 2&>1 | perl -ne 'print " $_"'
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"' 2&>1
in the shell as such, you need to use the 2&>1 to get the stderr redirected to the stdout.
as I don't use unix alot, I am not sure where to put that:
perl -e 'print "aaa\n"; warn "bbb\n"' 2&>1 | perl -ne 'print " $_"'
perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"' 2&>1
(perl -e 'print "aaa\n"; warn "bbb\n"' | perl -ne 'print " $_"; ') 3>&1 1>&2 2>&3 3>&- | perl -ne 'print "** $_"'
ASKER
there is a order problem
The command:
(perl -e 'print "aaa\n"; sleep(1); warn "bbb\n"; sleep(1); warn "ccc\n"' | perl -ne 'print " $_"; ') 3>&1 1>&2 2>&3 3>&- | perl -ne 'print "** $_"'
is printing:
** bbb
** ccc
aaa
in my cygwin.
so it isn't a good solution.
The command:
(perl -e 'print "aaa\n"; sleep(1); warn "bbb\n"; sleep(1); warn "ccc\n"' | perl -ne 'print " $_"; ') 3>&1 1>&2 2>&3 3>&- | perl -ne 'print "** $_"'
is printing:
** bbb
** ccc
aaa
in my cygwin.
so it isn't a good solution.
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