spal

  $ printf linkedintrouble | openssl sha1 | cut -c10- | grep -f - combo_not.txt 
  3ac85868a20c977661a12f770f0d116f87c74831

  $ printf linkedintrouble | openssl sha1
  (stdin)= 3ac85868a20c977661a12f770f0d116f87c74831

  $ cat combo_not.txt | grep `printf linkedintrouble | sha1sum`
  3ac85868a20c977661a12f770f0d116f87c74831
  $ cat combo_not.txt | grep `printf nathanlinkedin | sha1sum`
  a4d28368130ad555c77ec6a4dd18b8977ac0f589
  $ cat combo_not.txt | grep `printf mypassword | sha1sum`
  $ cat combo_not.txt | grep `printf yourpassword | sha1sum`
  $