On: 6.5 Million LinkedIn Password Hashes Leaked

[16s]

You might compare many words at once (say from a popular password list such as rockyou) like this:

while read line; do echo -n $line | sha1sum | cut -c6-40 | awk '{print "00000" $0}'; done < rockyou.txt

I haven't tested that, but I think it'll work.