From Tobias Schlitt's weblog today:

I always wanted to have the PEAR commands get auto completed on my bash. Here is how it works:

complete -W "`pear 2>&1 | awk '{ORS=" "} /[a-zA-Z-]+ / {print 60}'`" -f pear

Usually I'd have expected to get the stuff working using complete's "-C" option, this did not work for me, I got a list of all possible commands when typing , but neither a correct completion suggestion nor a completion.