I hope this is the right place to post this sort of question. I've been working on a simple csh assignment but I've hit a snag which is really strange to me. It's meant to be a simple matching program that matches words according to different criteria when different options are provided. It all works fine except if I try to do option '-w' or an unrecognised option (the 'default' in the switch statement) it gives me an error: "if: Missing file name". I don't understand why all the other options work fine but these don't. Any help or advice would be really appreciated. ^_^. #!/bin/csh -f set b = 0 if ($#argv == 0) then echo "Missing pattern" echo "Usage: match [-opt ...] pattern [...]" exit 0 endif #if there is an option store it in opts and shift argv if ($argv[1] =~ -?) then set opts = $argv[1] shift argv set b = 1 endif set word = `echo $argv[1] | awk '{gsub("_","."); print $0}'` #if there was no option then do a simple grep if ($b == 0) then grep $word else switch ($opts) case -i: grep -i $word; exit 0 case -v: grep -v $word; exit 0 case -w: grep -w $word; exit 0 case -p: grep ^$word; exit 0 case -s: grep $word\$; exit 0 default: echo "Unknown option: $opts" echo "Usage: match [-opt ...] pattern [...]" breaksw endif