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#! /usr/bin/perl -w

...
close OUTFILE;
close INFILE;
return (0);

Global symbol "%opts" requires explicit package name at skipjack.pl.td
+y line 8.
Global symbol "$cipher" requires explicit package name at skipjack.pl.
+tdy line 10.
...
Global symbol "$INFILE" requires explicit package name at skipjack.pl.
+tdy line 14.
Global symbol "%opts" requires explicit package name at skipjack.pl.td
+y line 14.syntax error at skipjack.pl.tdy line 14, near "%opts{"
Execution of skipjack.pl.tdy aborted due to compilation errors.