cvs annotate demo for http://stackoverflow.com/q/29038112/82

$ cvs annotate hello.txt

Annotations for hello.txt
***************
1.2          (kst      13-Mar-15): # $Revision: 1.1 $
1.1          (kst      13-Mar-15):
1.1          (kst      13-Mar-15): Hello ...
1.2          (kst      13-Mar-15): ... and good-bye
$ cat annotate.pl
#!/usr/bin/perl

use strict;
use warnings;

my $output = `cvs annotate hello.txt 2>annotate.err`;

print ">>> Output of \"cvs annotate\":\n";
print $output;

print ">>> Contents of annotate.err:\n";
system qw(cat annotate.err);

print ">>> done.\n";
$ ./annotate.pl
>>> Output of "cvs annotate":
1.2          (kst      13-Mar-15): # $Revision: 1.1 $
1.1          (kst      13-Mar-15):
1.1          (kst      13-Mar-15): Hello ...
1.2          (kst      13-Mar-15): ... and good-bye
>>> Contents of annotate.err:

Annotations for hello.txt
***************
>>> done.
$