Need Help in Case Output (BASH) -

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i have simple case says like

case "$1" in     -b*) myfunction exit 0;;     -b*) echo "invalid!" >&2 exit 1;; esac

what want when user input argument using "b", stuff myfunction. else, if user input using "b", print error , exit program.

however, happens when user input "b", prints

invalid! exit 1

instead of

invalid!

also, gives exit value of "0" instead of "1". know part did wrong?

replace in script

echo "invalid!" >&2 exit 1

by

echo "invalid!" >&2; exit 1

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