Command:
$ wcount=$[`wc -l < /usr/share/dict/words`];fromhead=$[$wcount - 1];random=$[`jot -r 1 0 $fromhead`];head -$[$random] /usr/share/dict/words | tail -1
Result:
everywhereness
Explaination:
Dictionary used: /usr/share/dict/words
Generating random line number: jot command
