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 ULTRIX
xlator_call
xlator_call(8) System Manager's Manual xlator_call(8)
Name
xlator_call - shell script to invoke PostScript translators
Syntax
xlator_call datatype orientation pagesize width length indent
Description
This Bourne shell script can be called by the line printer daemon to invoke the appropriate translator to convert each data type to Post-
Script. The data type passed by may be specified by using the command with the -Ddatatype option, or by using the Da=datatype capability
in the file.
For a file in a data syntax to be translated to PostScript, the script must contain a case branch which recognizes the data type string and
calls a suitable filter. The supplied recognizes the ANSI, ASCII, ReGIS and Tektronix 4014 data types.
Arguments
datatype
The valid data types are: or any other for which a translator has been installed.
orientation
The valid orientations are: portrait or landscape.
pagesize
The valid page sizes are: or
width
The width (in characters) of the page.
length
The length (in lines) of the page.
indent
The amount (in spaces) the output is to be indented.
All the valid arguments are described in detail by the reference page.
Examples
An example shell script is shown below:
case $datatype in
ansi)
exec ansi_ps -F $pagesize -O $orientation -e "$@";;
ascii)
echo "( 04) cvn {} def"
exec ln03rof -w$width -l$length -i$indent;;
postscript)
exec cat;;
tek4014)
exec tek4014_ps -F $pagesize -O $orientation;;
regis)
exec regis_ps -F $pagesize -O $orientation;;
*)
echo "$0: Translator for data type $datatype not installed" >&2
esac
When the shell script is called, the path searched is:
/usr/local/lib/lpdfilters:/usr/ucb:/bin:/usr/bin:
/usr/lib:/usr/lib/lpdfilters
Files
The script
See Also
lno3rof(8), printcap(5), ansi_ps(8), lpd(8)
xlator_call(8)