#!/bin/zsh
#< /dev/urandom | tr -dc 'a-z0-9_' | fold -w 5 \
#< /usr/share/dict/cracklib-small | grep -E '^\w{4}$' \
while read -r; do
    curl -s 'https://twitter.com/users/username_available' -d username=$REPLY \
    | grep -lq ',"valid":true' && echo $REPLY || echo \#$REPLY
done