On Windows:

C:\Windows\system32>pwd
/c/Windows/system32

C:\Windows\system32>perl -E"say `pwd`"
/c/Windows/system32


C:\Windows\system32>perl -E"say eval{`pwd`}"
/c/Windows/system32


C:\Windows\system32>perl -E"say eval{'pwd'}"
pwd

C:\Windows\system32>perl -E"say system('pwd')"
/c/Windows/system32
0

[download]

On Linux (Raspbian):

dr@mail:~ $ pwd
/home/dr
dr@mail:~ $ perl -E'say `pwd`'
/home/dr

dr@mail:~ $ perl -E'say eval{`pwd`}'
/home/dr

dr@mail:~ $ perl -E'say eval{"pwd"}'
pwd
dr@mail:~ $ perl -E'say system("pwd")'
/home/dr
0

[download]

I think you are confusing yourself by combining eval with backticks. Backticks alone should work, as demonstrated above. I prefer qx() to backticks as I find it clearer, but the effect is identical and a matter of preference. Your error message suggests that the executable is either not where you expect or not named what you think, but that's a different problem. Try the examples I have given with your executable and you should end up on the right road.

Regards,

John Davies

Almost immediate update as you solved your problem while I was composing my suggestions: it looks as though the executable was not where you expected. The leading two dots are taking you to a relative directory rather than the absolute one you specified originally.

In reply to Re: use of Backticks to catch console output by davies
in thread use of Backticks to catch console output by Takamoto

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.