Just to pick at this ... sorry and all that ...Better to simply declare it public domain. Using the GPLv3 for a simple (trivial) script is like cracking a nut with a steamroller. Wrong tool.
Specifically, using the GPLv3 means that this 22 line BASH script would have to be distributed with a copy of the licence etc etc. Impractical and pointless at best, at worst it degrades the use of GPL licences.
