Oh, I use parameters for quite a bit, but while in testing, and dealing with an issue with a learning disability, I run into issues where I might use the parameters when launching from one routine, but not from another and I know I won't remember it if I need to use it from the command line.

My intent here is for the launched program to be able to check something quickly and easily and know if it's run by another Perl program or from the command line. I'm also mistake-proofing it for later, so if I (or those I'm working with) run it from the command line with the wrong argument, it'll still know for sure.

So, in this case, I think the easiest and best way is to have some way besides a parameter to verify what's running a script. I knew, before I asked, there was likely some way, since I see how output for some bash commands differs depending on if they're sending output to STDOUT or to a file.

In reply to Re^4: How Was My Script Run? by HalNineThousand
in thread How Was My Script Run? by HalNineThousand

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.