I wasn't sure if you were sharing a technique or asking a question. I tried your method (I use zsh but never fully "got" compctl). It doesn't do what I'd want, which is: $ open -a i[tab] would prompt with $ open -a iCal iCal iChat iDVD iMovie\ HD iPhoto\ Diet iPhoto\ Library\ Manager iPhoto iStumbler iSync iTunes iWork instead I get open -a /Applications\ \(Mac\ OS\ 9\)/Acrobat\ Reader\ 5.0/Acrobat \ Reader\ 5.0 zsh: do you wish to see all 427 possibilities (427 lines)? presumably because there is an 'i' matched *somewhere* but I intended for it to *only* match apps which began with the letter "i" All of my apps (except Finder) are in /Applications (I don't use OS 9 although it is installed) and the .app extension is optional, I believe TjL