A few suggestions

[sodiumchl]

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"

[BrendanThompson]

@sodiumchl thanks for the feedback mate! Feel free to submit a PR on this 😄