Are you sure abc.pl is generating output when called outside the script? Is it to STDOUT or STDERR? You can check for errors (Tip #7 from Basic debugging checklist): 
$my = `/home/hey/abc.pl`;
print $? if $?;

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In reply to Re: Directing STDOUT of called perl script to a variable within a calling perl script by toolic
in thread Directing STDOUT of called perl script to a variable within a calling perl script by uday_sagar

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