I recently posted an approach for a self-updating bash script. Shortly after using it in production, I noticed a critical shortcoming. Due to the simple way in which I implemented my update checking (an MD5 sum over the script itself), changes to the script interpreter line (aka shebang) would cause the script to output that [...]

Note: There is a revised version of this script available. While working on the typo3scripts project, I wanted to implement a self-updating feature into each of the scripts as that seemed most convenient for where these scripts would be used. My initial approach was OK but left me wondering. So, here is the revised approach [...]