nexus/find_unused_letters.sh

#!/bin/bash
echo {a..z} {A..Z} | tr ' ' '\n' | egrep -v $(grep addcom *.c | grep -v '//' | grep -v \\\\ | awk -F\' '{print $2}' | egrep "[a-zA-Z]" | tr '\n' '|' | sed 's/^|//;s/|$//')
	`#!/bin/bash`
	`echo {a..z} {A..Z} \| tr ' ' '\n' \| egrep -v $(grep addcom *.c \| grep -v '//' \| grep -v \\\\ \| awk -F\' '{print $2}' \| egrep "[a-zA-Z]" \| tr '\n' '\|' \| sed 's/^\|//;s/\|$//')`