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my @customerarray = ( ... ); ... open FH, '>', "$cuslist.tmp" or die "Can't open $cuslist.tmp: $!"; print FH "$_\n" for @keep; close FH;
open FH, '>', "$cuslist.tmp" or die "Can't open $cuslist.tmp: $!"; print FH "$_\n" for grep { time - split '::', $_)[2] <= 15*24*60*60 } +@customerarray; close FH;