My objective is to run some 'N' number of PHP Scripts in cron. Since these are web scrapers coded in PHP and hits database on my server, each script runs for like 1 hour and they take a lot of CPU and memory. That's why I want to run one script at a time.My first approach was to run each script at specific hour of the day but then there are only 24 hours in a day, so I can't really go with that way.I have prepared a Unix script which runs in an infinite loop and runs the entire script. Assuming the shell will execute one script, wait for some time and then execute the next script. This is my script 1, say.Then there is another script, Script 2 which runs every 3 hours and checks if Script 1 is running. If Script 1 is not running it will execute Script 1.My concerns:Is it feasible to run like 100 PHP scripts from one Unix script? If one fails, will it fail the whole script?Is there any better approach?Script 1 (MasterCronCarlos.sh):#!/bin/bash# Description = Script to check cpu usage and if above threshold issue a linux based command.# This Script only checks user cpu time (us - userspace (doing userspace stuff))#SUBJECT=CRON Status | Jai CarlosTO=myemail@gmail.comwhile truedoecho -en Starting fresh loop of cron | mail -s $SUBJECT $TO    php /home/site1/public_html/scrapperM1.php    sleep 300    php /home/site1/public_html/scrapperM2.php    sleep 300    php /home/site1/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site1.com | mail -s $SUBJECT $TO    php /home/site2/public_html/scrapperM1.php    sleep 300    php /home/site2/public_html/scrapperM2.php    sleep 300    php /home/site2/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site2.tv | mail -s $SUBJECT $TO    php /home/site3/public_html/scrapperM1.php    sleep 300    php /home/site3/public_html/scrapperM2.php    sleep 300    php /home/site3/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site3 | mail -s $SUBJECT $TO    php /home/site4/public_html/scrapperM1.php    sleep 300    php /home/site4/public_html/scrapperM2.php    sleep 300    php /home/site4/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site4 | mail -s $SUBJECT $TO    php /home/site5/public_html/scrapperM1.php    sleep 300    php /home/site5/public_html/scrapperM2.php    sleep 300    php /home/site5/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site5 | mail -s $SUBJECT $TO    php /home/site6/public_html/scrapperM1.php    sleep 300    php /home/site6/public_html/scrapperM2.php    sleep 300    php /home/site6/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site6 | mail -s $SUBJECT $TO    php /home/site7/public_html/scrapperM1.php    sleep 300    php /home/site7/public_html/scrapperM2.php    sleep 300    php /home/site7/public_html/scrapperM3.php    sleep 300    echo -en Script completed for site7 | mail -s $SUBJECT $TOdoneScript 2 (mastercron.sh):#!/bin/shRESULT=`ps axf | grep MasterCronCarlos.sh | grep -v grep | awk '{print  $1}'`if [ $RESULT -ge 0 ]; thenecho Runningelseecho Not Runningsh /home/backups/MasterCronCarlos.shfi;
Run 'N' Number of PHP Scripts on shell forever in a loop
php;shell;unix