Shell Programming and Scripting

$ ls
call3.pl	script1.pl	script2.pl	script3.pl
$ cat call3.pl
#!/usr/bin/perl

system("perl script1.pl $ARGV[0]&");
system("perl script2.pl $ARGV[0]&");
system("perl script3.pl $ARGV[0]&");
$ cat script*
#!/usr/bin/perl

foreach (0 .. $ARGV[0]) {
print "Script1: $_\n";
sleep 1;
}
#!/usr/bin/perl

foreach (0 .. $ARGV[0]) {
print "Script2: $_\n";
sleep 1;
}
#!/usr/bin/perl

foreach (0 .. $ARGV[0]) {
print "Script3: $_\n";
sleep 1;
}
$

$ perl call3.pl 5
Script1: 0
Script2: 0
$ Script3: 0
Script1: 1
Script2: 1
Script3: 1
Script1: 2
Script2: 2
Script3: 2
Script1: 3
Script2: 3
Script3: 3
Script1: 4
Script2: 4
Script3: 4
Script1: 5
Script2: 5
Script3: 5