I do this if I have to look up the right flag to use. If it's something commonly seen like "grep -o" or "tar -xvzf" I assume whoever is maintaining the script (probably future me) will be more familiar with the abbreviations than the long versions.

Yeah good point. It did strike me, though, because I'd just written several scripts running JMeter commands and sort of breezed over how they're written even though I had to go and look up all the flags.