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Top Forums UNIX for Beginners Questions & Answers Shell Script behaviour and syntax Post 303045796 by Cybora on Monday 13th of April 2020 03:45:46 PM
Old 04-13-2020
Shell Script behaviour and syntax

Here are the 3 scripts(FirstScrpt.sh,firstcallScrpt.sh,startProcess.sh) that were running in the server for the past several years.
I understand the way it is written is that for every 1 hour 'firstcallScript.sh' is being called in that it kills the pid of 'startProcess.sh'
and starts again.

2 things I noticed
1. Value of pid.txt never changes if it is being is killed and created every hour.
2. It never runs in the background even when it is run with '&' like (./FirstScrpt.sh &)

FirstScrpt.sh
Code:
#!/bin/bash

if [ $# -ne 1 ]
then
	echo "Usage:  $0 test|prod"
	exit 1
fi
envRun=$1

  echo "Level is :  ${envRun}"
	while [ 1 ]
	do
	cat pid.txt | xargs -l1 kill
	./firstcallScript.sh ${envRun}
	sleep 3600
	done

firstCallScript.sh
Code:
#!/bin/bash

if [ $# -ne 1 ]
then
	echo "Usage:  $0 test|prod"
	exit 1
fi
envRun=$1

if [ $envRun = "test" ] 
then
  echo "Level is  :  ${envRun}"
     ./startProcess.sh ${envRun}
   
 else
   echo "Level is test Invoke test script :  ${envRun}"
   	./startProcess.sh ${envRun}
	
fi

startProcess.sh

Code:
#!/bin/bash 
envRun=$1
echo "${envRun}"
echo "I'm a Linux user."
echo $! > pid.txt


Last edited by Cybora; 04-13-2020 at 04:53 PM.. Reason: Edited the firstScript for 1 hour of sleep
 

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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)
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