Re: how do i execute dependant system commands in perl (i m trying waitpid but does not work)

& does exactly the opposite of what you want. It causes the shell to not wait for its child to finish.

system is basically fork+exec+waitpid mixed into one.

system("zcat....> file1");
system("java file1");
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Or if you don't want to wait for java to finish,

system("( zcat....> file1 && java file1 )&");
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