Dear Masters,
I have following system call within a main perl script:

#!/usr/bin/perl
system("perl script1.pl input.txt output.txt"); # A long process
system("perl script2.pl output.txt finalout.txt");
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Now script2.pl has to wait until script1.pl is finished. The problem I have is that the current script above execute script2.pl before script1.pl is finished. While running main script the error it gives is:

script2.pl : failed to open input file output.txt : No such file or di
+rectory
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How can I make it such a way that it does what I intended. I tried the following but it doesn't seem to do the job:

#!/usr/bin/perl
system("perl script1.pl input.txt output.txt");

WL:
while(0) {
   sleep 10;
   if ( -e "output.txt") {
    system("perl script2.pl output.txt finalout.txt");
    last WL;
   }
}
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