tish (tiny interactive shell)
うわ、負荷テストでbashに勝っちゃった。
time ((repeat 1000 echo 'ls|cat|cat|cat&') | cat | ./tish) 1.51s user 4.01s system 92% cpu 5.963 total time ((repeat 1000 echo 'ls|cat|cat|cat&') | cat | bash) 1.72s user 4.45s system 99% cpu 6.239 total time ((repeat 1000 echo 'ls|cat|cat|cat&') | cat | zsh) 3.72s user 10.82s system 98% cpu 14.802 total