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Full Discussion: Monitoring processes in parallel and process log file after process exits
Top Forums Shell Programming and Scripting Monitoring processes in parallel and process log file after process exits Post 303003338 by Corona688 on Tuesday 12th of September 2017 01:40:27 PM
Old 09-12-2017
You can make your script a lot simpler by using more of the shell's own basic features. You can split input on fields in shell without the help of awk, sed, and tr. You can write to the same file 37 times instead of reopening the same files 37 times to append.

Also, why bother with all the pgrep stuff when you made yourself such a nicely formatted list of PID's to read?

Code:
#!/bin/bash

infile="$1" ; shift
PWD=`pwd`
exec 2>&1

NEWIFS=`printf "\r\n\t "` # Make sure read splits on carriage returns too

while IFS="$NEWIFS" read IPADD JUNK
do
        OPFILE=${IPADD}_syslog.txt
        nohup ${PWD}/collect_log.sh $IPADD > ${OPFILE} &
        DPID=$!
        echo "$DPID $OPFILE"
done < "$infile" > pid_pfile.txt

while read DPID OPFILE
do
        wait "$DPID"  # Waiting for a specific PID may require bash or ksh
        HNAME=`grep -i hostname |awk '{print $NF}'` # ???? What is this reading from?
        awk '/name/,/exit/'  $OPFILE |head -n -1 |awk '{print $1,$2,$3,$4,$5}'> ${HNAME}.txt
done < pid_pfile.txt

rm -f pid_pfile.txt

Also, if we knew what your data looked like, we could probably streamline that awk / grep / awk / head / awk down into one awk call.
Last edited by Corona688; 09-12-2017 at 05:49 PM.. Reason: Fix IPADDR / IPADD typo
These 2 Users Gave Thanks to Corona688 For This Post:
RavinderSingh13 shunya
 

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LEARN ABOUT DEBIAN

startpar

STARTPAR(8)						      System Manager's Manual						       STARTPAR(8)

NAME

       startpar - start runlevel scripts in parallel

SYNOPSIS

       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ...
       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop]

DESCRIPTION

       startpar  is  used  to run multiple run-level scripts in parallel.  The degree of parallelism on one CPU can be set with the -p option, the
       default is full parallelism. An argument to all of the scripts can be provided with the -a option.  Processes blocked by pending  I/O  will
       cause  new  process  creation  to be weighted by the iorate factor 800.	To change this factor the option -i can be used to specify another
       value.  The amount weight=(nblockedxiorate)/1000 will be subtracted from the total number  of  processes  which	could  be  started,  where
       nblocked is the number of processes currently blocked by pending I/O.

       The  output  of	each  script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify
       this behaviour by setting a timeout.

       The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout
       seconds ago, startpar will flush the buffer.

       The  -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of
       the script with the oldest output. Afterwards it will only print output of this script until it is finished.

       The -M option switches startpar into a make(1) like behaviour.  This option takes three different arguments:  boot,  start,  and  stop  for
       reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/.  By scanning the boot and runlevel direc-
       tories in /etc/init.d/ it then executes the appropriate scripts in parallel.

FILES

       /etc/init.d/.depend.boot
       /etc/init.d/.depend.start
       /etc/init.d/.depend.stop

SEE ALSO

       init(8) insserv(8).

COPYRIGHT

       2003,2004 SuSE Linux AG, Nuernberg, Germany.
       2007 SuSE LINUX Products GmbH, Nuernberg, Germany.

AUTHOR

       Michael Schroeder <mls@suse.de>
       Takashi Iwai <tiwai@suse.de>
       Werner Fink <werner@suse.de>

								     Jun 2003							       STARTPAR(8)
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