From Ubuntu 21.04:
andrew@Andrew-Workstation:~/serenity$ ls
AK azure-pipelines.yml Base Build CMakeLists.txt CONTRIBUTING.md Documentation Kernel LICENSE Meta Ports README.md Tests Toolchain Userland
andrew@Andrew-Workstation:~/serenity$ unset PATH
andrew@Andrew-Workstation:~/serenity$ ls
bash: ls: No such file or directory
andrew@Andrew-Workstation:~/serenity$
And from Serenity:
Note that processes spawned from Shell are unable to find things, but Shell itself doesn't reset its PATH when unsetting shell variables that happen to be its own env vars (maybe?).
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