Hi peterbk,

Is there an easy way of distinguishing in perl between input from STDIN and using parameters?

For determining whether the script should use STDIN for accepting parameters, you could use the usual convention (at least for many *NIX tools) that the script has no arguments passed to it, or a single argument consisting of a dash:

my @args;
if (!@ARGV || @ARGV==1 && $ARGV[0] eq '-')
  { @args = <STDIN> }
else
  { @args = @ARGV }

[download]

Update: This doesn't handle quoting on the arguments passed on STDIN, but it does allow whitespace in arguments if you place the arguments each on their own lines. If you really need to parse quotes, Text::ParseWords's shellwords has already been mentioned.

Hope this helps,
-- Hauke D

In reply to Re^3: passing parameters from shell script to perl program doesn't preserve spaces by haukex
in thread passing parameters from shell script to perl program doesn't preserve spaces [solved] by peterbk

Title:
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, details, 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, summary, 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.