Generally speaking, most built-in Perl functions return a value which indicates success, with a non-true value indicating failure (zero, empty string, or undef). Many user-written Perl functions follow the same convention.

System commands in Unix, Windows, etc., will result in a numeric exit value indicating an error, with zero indicating no error.

In reply to Re^3: a small doubt by KILNA
in thread a small doubt by sandy105

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