[petcat]

> a robust bash script

These hardly exist in practice.

But I get what you mean.

[sam_lowry_]

Yoy don't. It's bash only because the parent process is bash, but otherwise it's all grep, sort, tr, cut and othe textutils piped together.

[mjevans]

awk can do some heavy lifting too if the environment is too locked down to import a kitchen sink of python modules.