Be warned that if you use pt-align, it may not always show you all the rows that you put in.
When I first installed the percona-toolkit I was especially excited about pt-align, which allows me to reformat any tabular output on the screen like say the output all servers uptime in a format where I can see all the load in one column (cat alldb | pdsh -w - uptime | pt-align).
However just today I ran into a situation where it just drops a row, so it looks like I should not lean on the tool without double checking for that.
centos 6.3 / percona-toolkit-2.1.2-1.noarch
I attached the two files, the second is created by ‘cat before_ptalign.txt | pt-align’ and is missing one of the lines in the middle with the ‘2 min’.