(This is my first meditation. I am posting in hopes it will help someone down the line! I can't find another node about this, but that doesn't mean there isn't one :) .)

I needed to run a program and then wait for the user to hit Enter. I tried this:

$ perl -e 'system(@ARGV); readline' echo foo foo Can't open echo: No such file or directory at -e line 1. Can't open foo: No such file or directory at -e line 1.
Not what I expected!

After all, perlrun says that:

If -e is given, Perl will not look for a filename in the argument list.

What I was missing is that readline does look at the argument list. Readline:

reads ...from *ARGV if EXPR is not provided

So what I needed was to expressly read from STDIN to get my keypress:

# vvvvv $ perl -e 'system(@ARGV); readline STDIN' echo foo foo (<=== waited here for me to press Enter)

In reply to A readline + -e oddity: readline opens files even with -e --- need "readline STDIN" to read from console by cxw

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.