cdgem is a small bash utility function to cd into a rubygem's directory

gistfile1.sh

# cd into matching gem directory ("cd -" friendly)
#
#   cdgem noko        # will cd into the first gem matching noko
#   cdgem ^rails-     # will cd into the first gem starting with "rails-"
#   vim $(cdgem noko) # will open the gem's directory in vim
cdgem() {
  local gempath=$(gem env gemdir)/gems;
  local gem=$(ls "$gempath" | grep "$1" | sort | tail -1);

  if [ -z "$1" ]; then
    [ -t 1 ] && cd "$gempath" || echo "$gempath";
  elif [ -n "$gem" ]; then
    [ -t 1 ] && cd "$gempath/$gem" || echo "$gempath/$gem";
  else
    echo "Could not find gem \"$1\" in \"$gempath\"" 1>&2;
    return 1;
  fi
}

Very useful. Thanks.