Linux

I recently had to port a bash script to POSIX because my boss demands we still use at, and wants exec to look like at -f.

99% of my time is spent in bash, so in conjunction with the POSIX spec documentation, Copilot was useful in finding a solution for >(and ...) redirection (logging related), as my bash solution was not compliant.

It was helpful, but I still took the time to locate examples in the spec, and validate every single answer I got.

Outside of this, it has basically never been more productive than doing my own searches, research & testing (sysadmin & "devops").