A few suggestions

Thanks for the script!

Here are a few suggestions:
1> /dev/null should be > /dev/null
Otherwise, there is an error when running on MacOS.

Include correct email in key. Add the following in createKey():
        KNAME=$(basename $KEY)
        grep -q '@' <<< $KNAME || KNAME=$KNAME@$HOSTNAME
        KEYEMAIL="-C $KNAME"

        COMMAND="$COMMAND $TYPE $BITS $KEYEMAIL $OUTPUT_DIR $PASS"
