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  1. or download this
    #!/usr/bin/perl
    use warnings;
    ...
    while (<>) {
        printf '%3.7f | %s', time - $start, $_;
    }
    
  2. or download this
    for i in {1..10} ; do sleep .2 ; echo $i ; done | prepend.pl
    
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
    }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,