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#!c:\perl\bin\perl.exe -w ... 1125394800 63597 0 63597 0 1125394500 63597 0 63597 0 1125394200 63597 0 63597 0
perl.exe -ple "s/ \d{4,}( |$)/ 0$1/g" filename
$line =~ s/ (\d+)/$1>1000?" 0":" $1"/ge;