Re: Guess what it does ... and a challenge

This does it slowly and is one character shorter than the one you gave in your spoiler:

Update: Btw one could try this (CAUTION! DON'T TYPE BLINDLY!):

but it doesn't work, because

it fills up your disk instead. With GNU Coreutils, you can use the TMPDIR env-var to override where it puts its temporary files. Eg.

[am]king ~$ TMPDIR=/dev/shm/ time perl -we '`yes|tac`'
tac: /dev/shm//tacck0ml6: write error: No space left on device
11.48user 2.56system 0:14.05elapsed 99%CPU (0avgtext+0avgdata 0maxresi
+dent)k
0inputs+0outputs (0major+1382minor)pagefaults 0swaps
[download]

Update: On the other hand, this works, and is shorter than the first one:

Update: the following works too and is even shorter:

1+`yes`
[download]

Update: and one more character shorter is:

Update: the following has the same length as the first one in this node, but is a slower than that:

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