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Sub-Scripts Query

by kool_kk21 (Initiate)
on Jun 03, 2013 at 11:04 UTC ( #1036717=perlquestion: print w/ replies, xml ) Need Help??
kool_kk21 has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks, I have a perl script which in turn calls another shell script.Now the requirement is that as soon as this shell script prompts for a username my perl script should exit from that and continue its operation.Is it possible???? Thanks in advance

Comment on Sub-Scripts Query
Re: Sub-Scripts Query
by bart (Canon) on Jun 03, 2013 at 11:39 UTC
    That should be possible if you pipe from perl to the shell script, and back. I recommend taking a look at Bidirectional Communication with Another Process in perlipc, and at IPC::Open2.

    If your shell program prints out a prompt, then I guess you could just wait for the prompt via the Reader handle, and when it appears, resume your script. You can most likely even just send out the info to the shell script via a print via the Writer. It soon gets very hairy beyond those basics.

    N.B. There's also the module Expect which serves to script other shell programs, but I've never used it and I'm quite sure it will not work well on Windows.

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