G'day mmittiga17,
Here's another way to do it:
#!/usr/bin/env perl
use 5.010;
use strict;
use warnings;
local $/ = 'CUSIP';
while (<DATA>) {
s{\s*$/$}{}m;
next unless $_;
s{\n}{ }gm;
s{\s*$}{};
say $/, $_;
}
__DATA__
CUSIP data data data
data data data data
data data data data
CUSIP data data data
data data data data
data data data data
CUSIP data data data
data data data data
data data data data
Output:
$ pm_merge_multiline_with_leader.pl
CUSIP data data data data data data data data data data data
CUSIP data data data data data data data data data data data
CUSIP data data data data data data data data data data data
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