absh: A/B testing for shell scripts

$ absh \
  -a "test a" \
  -b "test b" \
  -A "warmup for a" \
  -B "warmup for b"

It continuously run B, b, A, a; ignores the numbers of the first iteration, and then after third iteration it prints averages, and 95% confidence interval of B average/A average.

A: n=421 mean=61.181 std=1.701 se=0.083 min=57.687 max=66.103 med=61.218
B: n=421 mean=59.891 std=1.824 se=0.089 min=56.441 max=65.669 med=59.496
A: distr=[        ▁▁   ▃▃▃▅▂▅▆▃▄▇▆▃▅▂▁▂▅▃▁▄▄▆▇▅▄█▃▃▄▂▃▁▁ ▂ ▁  ▁        ]
B: distr=[   ▁▁▁▁▄▅▄▇▅▇█▂▃▅▃▅▃▁▁▂▃▃▂▅▂▃▅▆▂▅▃▅▁▁▃ ▂▁▁▁▁                 ]
B/A: 0.979 0.975..0.983 (95% conf)