system returns 0 on success and 1 on failure. Whenever you use system you should be using and to check for failure instead of or: 
system("$checkout $revdns")
   and warn "Problems with checking out $revdns : $!\n";

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In reply to Re: Illegal Seek from system() with no output from $? by vek
in thread Illegal Seek from system() with no output from $? by c

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