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'system @list' in background?

by vkon (Deacon)
on Jan 19, 2014 at 18:30 UTC ( #1071202=perlquestion: print w/ replies, xml ) Need Help??
vkon has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

according to documentation,
I can issue

system("cmd foo bar&")

so the process runs in background.

is this possible the same but when I specify 'system @list' syntax?

Thanks in advance!

Comment on 'system @list' in background?
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Re: 'system @list' in background?
by Anonymous Monk on Jan 19, 2014 at 22:22 UTC

    The system @list form bypasses the shell, so running the process in the background is possible, but it takes a lot more code if you want to implement it yourself. Before you try to implement this yourself it's probably much easier to just use a module like IPC::Run.

Re: 'system @list' in background?
by Anonymous Monk on Jan 20, 2014 at 02:46 UTC
Re: 'system @list' in background?
by ikegami (Pope) on Jan 20, 2014 at 15:22 UTC
    system('cmd foo bar &')
    is short for
    system('/bin/sh', '-c', 'cmd foo bar &')

    But you're surely asking to pass cmd, foo and bar as separate args.

    We can use sh to build the command:

    system('/bin/sh', '-c', '"$@" &', 'dummy', $prog, @args);

    Or we can use a Perl module to build the command:

    use String::ShellQuote qw( shell_quote ); system(shell_quote($prog, @args) . ' &'));

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