in reply to Re: External command execution - Strange Error - No child process
in thread External command execution - Strange Error - No child process

See no child process error in perl

You are getting the return value from waitpid probably done automatically by the backticks. The solution is to set 

$SIG{CHLD} = 'DEFAULT';

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in your Perl script. Or figure out how to localize it 
local $SIG{CHILD} = 'IGNORE';

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