gistfile1.txt

#!/usr/bin/env ruby
# Ruby script to generate SSHA (Good for LDAP)
require 'digest/sha1'
require 'base64'
# The output in hash will never have trailing whitespace, removed .chomp!
hash = Base64.encode64(Digest::SHA1.digest(#{pass}#{salt}#{salt}))

# Use string interpolation, no need to add \n puts does this for you
puts "userPassword: #{hash}"

The output for hash will not have trailing whitespace, so there is no need for .chomp!
Use string interpolation not the + method. Also, there is no need for \n since puts does this by default.