Calling scripts from other script.

Shell Programming and Scripting
1

I need to call 3 different shell scripts from 2 different scripts, one is a perl script and other is Shell script.

In Case -1 :
The perl script is myperlscript.pl
and the name of three shell scripts which need to be called from the perl script are a1.sh, a2.sh and a3.sh. Each shell script needs 1 hour to complete so total turn around time for the perl script is 3hrs. I want to run all three shell scripts in parallel and total turn around time would come down to 1 hr. Can you please suggest me, how can I call these shell scripts parallely?

In case 2:

Like above case, I need to execute the same shell scripts from another shell script i.e. myshell.sh.

Thanks a lot.
Siba sankar Nayak

2

You can call these scripts to run in background so your perl script will execute 2nd script without waiting for 1st one to complete.complete

 
a1.sh &
a2.sh &
a3.sh &