Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
An important thing to realize is that >tape is not an argument to the program, it's an instruction to the shell. The shell will open up the file tape, and redirect the output of cpio to that file. The command will never see that file on its command line at all.

Many commands that start programs, like system, exec, and IPC::Run::start, if given a list will directly execute the given program with the given arguments, without using the shell at all. Since it's the shell's job to handle output redirection, with no shell it doesn't happen.

It looks like you have one workable solution in your responses already, which is to use IPC::Run's speicial syntax for output redirection, something like IPC::Run::run \@cmd, '>', $tape. The docs say you can also pass a single string to IPC::Run::run, which will be passed to the shell, so IPC::Run::run("/bin/cpio -ov >$tape") might also work. Finally, for something so simple, consider just system.

Hope this helps!

In reply to Re: Using IPC::Run by sgifford
in thread Using IPC::Run by gw1500se

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others imbibing at the Monastery: (7)
    As of 2018-04-25 20:35 GMT
    Find Nodes?
      Voting Booth?