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help needede in backticks(``) and system function

by uva (Sexton)
on Feb 10, 2006 at 06:18 UTC ( #529288=perlquestion: print w/replies, xml ) Need Help??
uva has asked for the wisdom of the Perl Monks concerning the following question:

hello monks, what the difference between executing the external command in the system functionand the backticks operator. Is it correct ]system function] interpret the parent program and other one not.?
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Re: help needede in backticks(``) and system function
by ikegami (Pope) on Feb 10, 2006 at 06:34 UTC

    The difference is whether the output (STDOUT) is captured or now. Backticks return what was printed to STDOUT, while system does not.

    From the docs, it sounds like backticks always pass the command to a subshell, while it's possible to avoid running a subshell with system.

      thanks ikegami.... will both the execution will interrupt the paren.i mean, will parent program wait until the child completes execution.

        Yes, the parent will wait in both cases. Unless you do execute something like command & (unix) or start command (Windows).

        fork+exec doesn't wait.
        IPC::Open3 doesn't wait.
        IPC::Run can do both.
        The special syntax system 1, ... in Windows doesn't wait.

Re: help needede in backticks(``) and system function
by planetscape (Chancellor) on Feb 10, 2006 at 07:39 UTC

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