01-19-2007
control over shell script
Hi..
I have a perl program that uses "system" to execute a shell script called startengine. The script "startengine" itself calls a lot of other smaller scripts to setup the engine etc. It finally has to execute ./engine which is another shell script which is long and takes a long time to complete processing.
The "startengine" script looks like this
#!/bin/bash
echo In shell script............
/usr/agjy/bin/cleartool setview $1 <<END
cd /vobs/eng/work
. ./setup host-dbg gw
cd \$ENG_TARGET_ROOT/home/bin
pwd
/home/agjy/bin/stopAll
/home/agjy/bin/cleanup
./engine 2>&1 |tee $2
My problem is that the system call returns back to perl script without waiting for ./engine to finish processing..
I have tried sleep in the perl script which works only sometimes depending on machine speed. Another problem is that ./engine is a waiting process- ie if it runs correctly it should say "waiting for connection.. " and wait for input. the output of ./engine is written into the logfile ($2). The perl script then parses that
logfile looking for the "waiting for connection" string and proceeds to send input to the engine or shut it down depending on if string was matched or not.
I need something that will make sure ./engine is completely processed before control returns to perl script..
I hope i have made the problem clear and would really appreciate any help with this..
Thanks,
JLJ
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LEARN ABOUT LINUX
initscript
INITSCRIPT(5) Linux System Administrator's Manual INITSCRIPT(5)
NAME
initscript - script that executes inittab commands.
SYNOPSIS
/bin/sh /etc/initscript id runlevels action process
DESCRIPTION
When the shell script /etc/initscript is present, init will use it to execute the commands from inittab. This script can be used to set
things like ulimit and umask default values for every process.
EXAMPLES
This is a sample initscript, which might be installed on your system as /etc/initscript.sample.
#
# initscript Executed by init(8) for every program it
# wants to spawn like this:
#
# /bin/sh /etc/initscript <id> <level> <action> <process>
#
# Set umask to safe level, and enable core dumps.
umask 022
ulimit -c 2097151
PATH=/bin:/sbin:/usr/bin:/usr/sbin
export PATH
# Increase the hard file descriptor limit for all processes
# to 8192. The soft limit is still 1024, but any unprivileged
# process can increase its soft limit up to the hard limit
# with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel).
ulimit -Hn 8192
# Execute the program.
eval exec "$4"
NOTES
This script is not meant as startup script for daemons or somesuch. It has nothing to do with a rc.local style script. It's just a handler
for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable.
FILES
/etc/inittab, /etc/initscript.
AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl>
SEE ALSO
init(8), inittab(5).
July 10, 2003 INITSCRIPT(5)