(If you want to help me, this will only take you 1 minute!) I've hit a bug in the new Fedora 23 version of tcsh. Can someone help me confirm this bug on another box? It *only* happens on 64-bit x86_64 so I need someone running 64-bit. Also, it only seems to happen if gcc5 is used to compile, so your distro has to be pretty new (Fedora 23 or newer for example). Preferably kernel 4+ too. You can tell if you're 64-bit using: uname -i If you see 64 in there, you're 64. Try: gcc --version If it's 5+ that's good. Lastly, see what kernel ver: uname -r If it's 4+ then we're in business... All I need from you if match the above is start tcsh: tcsh If it says command not found then you need to install it with your package manager, like "dnf install tcsh" or "apt-get ...whatever". Then start tcsh by typing tcsh. Here's the actual test, paste this in tcsh: complete find 'n/-user/u/' 'n/-exec/c/' then type: find . -user [TAB] (hit TAB key where I put tab above, don't type the brackets) Does it list the users on your system or does it list the files/dirs in the current directory? My bug is that it shows the files, not the users. Could also try: complete tcsh n/-c/c/ then type: tcsh -c [TAB] Should give the same results (showing files instead of commands). One last thing, please let me know your tcsh version: tcsh --version I've only gotten this bug to occur on 6.19. Aside: this is a first, the bug is ONLY on my x86_64 boxes and not my i686 PAE ones! Ha! Thanks all!