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use warnings; use strict; ... rename $filename_in, "$filename_in.bak" or die "renaming '$filename_in +': $!"; rename $filename_out, $filename_in or die "renaming '$filename_ou +t': $!";
c:\@Work\Perl\monks\samira_saber>dir Volume in drive C is Acer ... c:\@Work\Perl\monks\samira_saber>fc topol1.au topol1.top.bak Comparing files topol1.au and TOPOL1.TOP.BAK FC: no differences encountered