Hmm, gnomon is a neat little tool. Just for the heck of it, here's a really simple Perl version (works on Linux, probably not on Windows):

#!/usr/bin/env perl
use warnings;
use strict;
use IO::Select;
use Time::HiRes qw/ gettimeofday tv_interval /;

my $sel = IO::Select->new(\*STDIN);
$|=1;
my $t0 = [gettimeofday];
while (1) {
    my $line;
    if ($sel->can_read(.1))
        { defined( $line = <STDIN> ) or last }
    printf "%7.3f | %s", tv_interval($t0), $line//"\r";
    $t0 = [gettimeofday] if defined $line;
}

[download]

In reply to Re: How to Prepending a timestamp to each line of output from a command by haukex
in thread How to Prepending a timestamp to each line of output from a command by jnarayan81

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