Redirect STDOUT & STDERR to file and then on screen Post: 303023906

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Top Forums Shell Programming and Scripting Redirect STDOUT & STDERR to file and then on screen Post 303023906 by Peasant on Tuesday 25th of September 2018 10:58:21 AM

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09-25-2018

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You will need to restore file descriptors to their original values.
This can be done from inside the script in point of code you like.

During runtime, outside of the script, possibly with some gdb hackery, but i would advise against it.

Example for both operations can be found by searching keywords above.

Hope that helps.
Regards
Peasant.

Peasant

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LEARN ABOUT DEBIAN

btraceback

BTRACEBACK(1)					     Network backup, recovery and verification					     BTRACEBACK(1)

NAME

	btraceback - wrapper script around gdb and bsmtp

SYNOPSIS

       btraceback /path/to/binary pid

DESCRIPTION

       btraceback is a wrapper shell script around the gdb debugger (or dbx on Solaris systems) and bsmtp, provided for debugging purposes.

USAGE

       btraceback  is called by the exception handlers of the Bacula daemons during a crash.  It can also be called interactively to view the cur-
       rent state of the threads belonging to a process, but this is not recommended unless you are trying to debug a problem (see below).

NOTES

       In order to work properly, debugging symbols must be available to the debugger on the system, and gdb, or dbx (on Solaris systems) must	be
       available in the $PATH.

       If  the	Director  or Storage daemon runs under a non-root uid, you will probably need to be modify the btraceback script to elevate privi-
       leges for the call to gdb/dbx, to ensure it has the proper permissions to debug when called by the daemon.

       Although Bacula's use of btraceback within its exception handlers is always safe, manual or interactive use of btraceback is subject to the
       same  risks  than  live debugging of any program, which means it could cause Bacula to crash under rare and abnormal circumstances.  Conse-
       quently we do not recommend manual use of btraceback in production environments unless it is required for debugging a problem.

ENVIRONMENT

       btracback relies on $PATH to find the debugger.

FILES

       /usr/lib/bacula/btraceback
	      The script itself.

       /usr/sbin/btraceback
	      symbolic link to /usr/lib/bacula/btraceback

       /etc/bacula/scripts/btraceback.gdb
	      the GDB command batch used to output a stack trace

AUTHOR

       This manual page was written by Lucas B. Cohen <lbc@members.fsf.org>

SEE ALSO

       bsmtp(1)

Kern Sibbald							  6 December 2009						     BTRACEBACK(1)