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Full Discussion: Redirecting command output as well as commands
Top Forums Shell Programming and Scripting Redirecting command output as well as commands Post 302441004 by AncientCoder on Thursday 29th of July 2010 06:04:01 AM
Old 07-29-2010
Question Redirecting command output as well as commands
I have a Bourne Shell script that is normally run as a background job and redirects it's output to a file internally (using exec >>); I use "set -x" to capture each command which provides me with a nice shell execution log if it all goes to pieces.

I now also need to be able to also run this as an interactive script whilst still keeping the "execution log" concept but have the output from certain commands also printed on the user terminal so they know what's going on during the long sections whilst keeping them in the log as well.

The following Sample Script shows on screen the output from msg() and the output from awk;
'user.log' is fine as a printable logfile;
'exec.log' shows everything BUT the output from awk

QUESTION (finally) - how can I get the output from awk to show on the original script stdout (ie user screen) AND also into exec.log

Sample Script:

Code:
msg() {
    echo `date "+%a %b %d %T"` "$*"  | tee -a user.log 1>&3
}
LOG=exec.log
exec 3>&1                    # remember original stdout (ie user screen)
exec >> $LOG 2>&1        # send stdout/stderr to execution log $LOG
msg "Commenced"          # shows on screen & into 'user.log'
set -x                         # show commands as they run
# use awk to print delayed messages to screen - also want o/p in $LOG
awk 'BEGIN {for(i=0;i<5;i++){printf "\rHelloooo" i;system("sleep 1")};print "";exit }' 1>&3
msg Ended                  # appears on screen, in user.log & $LOG
exit

Any advice/script fragments would be appreciated
Last edited by Scott; 07-29-2010 at 07:34 AM.. Reason: Please use code tags
 

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LEARN ABOUT DEBIAN

penlogd

PENLOGD(1)						      General Commands Manual							PENLOGD(1)

NAME

       penlogd - consolidate web server logs

SYNOPSIS

       penlogd [-fd] [-j dir] [-l logfile] [-n N] [-p pidfile] [-u user] port

EXAMPLE

       penlogd -l /var/log/access_log -p /var/run/penlogd.pid 10000

DESCRIPTION

       Penlogd	receives  log  entries from Pen and from each of the web servers. It consolidates the entries by replacing the source addresses in
       each entry with the "real" client address and writes the result to stdout or to the file  given	on  the  command  line.   This	completely
       removes the need for postprocessing with mergelogs, since the logs are already merged.

       Pen must be instructed to send its log to penlogd. See HOWTO and pen man page for details.

       Sending penlogd a HUP signal will make it close and reopen the logfile, unless it is logging to stdout. Rotate the log like this:

       mv access_log access_log.1 kill -HUP `cat <pidfile>`

       where <pidfile> is the file containing pen's process id.

       Sending penlogd a TERM signal will make it close the log file and exit cleanly.

OPTIONS

       -d     Turn  on	debugging.  The  output goes to stderr if we are running in the foreground (see -f) and to syslog (facility user, priority
	      debug) otherwise.

       -f     Stay in foreground.

       -j dir Run in a chroot environment.

       -l logfile
	      Write output into logfile.

       -n N   Number of pen log entries to cache (default 1000).

       -p pidfile
	      Write process id into pidfile.

       -u user
	      Run as a different user.

       port   The UDP port where penlogd receives log entries.

SEE ALSO

       pen(1), penlog(1), webresolve(1)

AUTHOR

       Copyright (C) 2002-2003 Ulric Eriksson, <ulric@siag.nu>.

								       LOCAL								PENLOGD(1)
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