1x~sleep 9

##</code><code>##

`yes|tac`

##</code><code>##

[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 0maxresident)k
0inputs+0outputs (0major+1382minor)pagefaults 0swaps

##</code><code>##

$x=`yes`

##</code><code>##

1+`yes`

##</code><code>##

-`yes`

##</code><code>##

1x~sleep$=