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From my script I am running following commands:

 SCRIPT_1="ksh -x script1.sh & ksh -x script2.sh"; SCRIPT_2="ksh -x script3.sh & ksh -x script4.sh"; eval $SCRIPT_1; sleep 20s; eval $SCRIPT_2;

I want to only execute the $SCRIPT_2 after the $SCRIPT_1 completes. But currently they both getting executed at the same time regardless of they are being executed in separate lines.

Any idea on how to wait for the other script to finish before executing the next one?

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    Just use wait to wait for all the background jobs. Commented Dec 17, 2014 at 15:58
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    See help wait. Commented Dec 17, 2014 at 15:58
  • That code runs script1.sh in the background but script2.sh in the foreground. Is that intended? The scripts of $SCRIPT_1 shall run in parallel and after all of them have finished those of $SCRIPT_2 shall run in parallel? Commented Dec 17, 2014 at 15:59
  • @HaukeLaging yes that's correct. Commented Dec 17, 2014 at 16:01

2 Answers 2

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SCRIPT_1="ksh -x script1.sh & bg_pid=$!; ksh -x script2.sh; wait $bg_pid"; SCRIPT_2="ksh -x script3.sh & bg_pid=$!; ksh -x script4.sh; wait $bg_pid"; eval $SCRIPT_1; sleep 20s; eval $SCRIPT_2;
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  • guess I wasn't clear. My problem is that I need to run String "$SCRIPT_1" first using eval command and then run the String "$SCRIPT_2" sequentially. Commented Dec 17, 2014 at 15:54
  • Can't you use ps to check script is still in process? I'm not sure using ksh, but in bash, I guess you can use: if [[ $(ps auxww | grep -i "script1.sh" | wc -l) -gt 1 ]] || [[ $(ps auxww | grep -i "script2.sh" | wc -l) -gt 1 ]]; then echo "Still in process "; else echo "Process SCRIPT_1 ended" ; fi; Maybe you should adapt it to ksh. Not sure. Commented Dec 17, 2014 at 16:05
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    @Albert You should rather use jobs (in bash; I am not familiar with ksh) for checking for background jobs. But wait is the superior approach anyway. Commented Dec 17, 2014 at 16:15
  • @HaukeLaging I'm quite sure. ps is the only way I knew to check if a process is running. Did not even know commands can be run using & concatenated. Not even the meaning of "$!". Now I know (after goggling... xD) Commented Dec 17, 2014 at 16:23
  • @Albert In the general case it is faster to just check whether /proc/$PID exists: if [ -d /proc/12345 ]; then echo yes; else echo no; fi Commented Dec 17, 2014 at 16:28
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Using GNU Parallel you would do something like:

parallel ksh -x ::: script1.sh script2.sh parallel ksh -x ::: script3.sh script4.sh
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