A Shell (bash) Puzzle

Here's a puzzle for bash experts. Create a file named puzzle.3.

1. It must be 3 lines long.
2. All lines except the first must consist solely of the string futz.
3. If you run bash puzzle.3, you should receive (all and only) this response:

puzzle.3: line 3: futz: command not found

So, your puzzle.3 file should behave exactly like this:

$ wc -l puzzle.3 ; tail -n +2 puzzle.3
       3 puzzle.3
futz
futz

$ bash puzzle.3
puzzle.3: line 3: futz: command not found

$

Now instead of 3, try 4 and 5. The challenge: how short can you make that first line? My results:

$ for i in 3 4 5; do echo puzzle.$i: $(head -1 puzzle.$i | wc -c); done
puzzle.3: 4
puzzle.4: 4
puzzle.5: 10

$

Remember that wc -c includes the newline, so there are 3, 3, and 9 actual characters on the first lines of each of those files respectively.

$ cat puzzle.3
: \
futz
futz

$ cat puzzle.4
<<\
futz
futz
futz

$ cat puzzle.5
<<futz<<\
futz
futz
futz
futz

$

Note: I am operating under the assumption that you don't have anything named futz in your PATH.