Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

How do I store and manipulate the output from another process?

by Elihu (Novice)
on Jan 25, 2000 at 07:21 UTC ( #2423=categorized question: print w/replies, xml ) Need Help??
Contributed by Elihu on Jan 25, 2000 at 07:21 UTC
Q&A  > programs and processes


I was trying to write a simple perl script the other day that, when given a tar or tar.gz file, got a listing of its contents (tar -tf or tar -tzf), put that into an array, then unlinked all those files. I often get tarballs that dump into the current directory, then have to manually delete all the files. I've written the script to take a file where I redirected the output of the tar listing, and removes files from the 2nd file, but I'd like to just dump all the files from the tarball into an array, and operate off of that.

Answer: How do I store and manipulate the output from another process?
contributed by vroom

Your best choices for collecting output from a program are using backticks `` or the open call.

$output=`tar -tf`; #collects all the output from the "tar -tf" comman +d open TAR, "tar -tf|"; #open a process with a pipe on the right side while(<TAR>){ #get the output line by line into $_; do_something($_); #process the results; } close TAR;
Answer: How do I store and manipulate the output from another process?
contributed by draconis

Another method would be to use qx(). qx() is a genralized form of using backticks - and is does interpolation as well.

$output=qx(tar -tf);

Please (register and) log in if you wish to add an answer

  • 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 the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (3)
    As of 2020-10-25 23:35 GMT
    Find Nodes?
      Voting Booth?
      My favourite web site is:

      Results (249 votes). Check out past polls.