Thanks for the detailed analysis and step by step walk through.

I tried the way you have advised. However, this time my error file says that "/sbin/sh: system: not found". Below is the code I tried, 

--------
#a.pl

#!/usr/bin/perl

system('ls -lrt > a.out');

--------

Comand 
$ at -f /tmp/a.pl now

commands will be executed using /sbin/sh
job 1323397408.a at Fri Dec  9 13:23:28 2011

Error:

/sbin/sh: system: not found

[download]

I am wondering why the external system command is not recognized in the perl.

Any thoughts my friend. When the perl script is executed with "At" command, it invokes a shell to execute the script. However, that shell is unable to recoginse the system command. Is that correct??

Please let me know what else I can try to resolve this issue.

Thanks In Advance

In reply to Re^2: system command is not working by gulla
in thread system command is not working by gulla

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.