getting a problem when I use which command with system function

greatshots has asked for the wisdom of the Perl Monks concerning the following question:

monks,

#!/usr/bin/perl

system("which ls");
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Output :-

machtype: Command not found.
/usr/bin/ls
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I am unaware of what is machtype in the output. when I did a google I found a linnk which describes about MACHTYPE. But I am getting this error only from the perl script.

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