Error Handling Traps

- `set -e` doesn't trigger in `if` condition — `if ! cmd; then` is safe - `set -e` doesn't trigger after `||` or `&&` — `cmd || true` is safe - `$(cmd)` in assignment doesn't trigger -e — subshell error not propagated - Exit code is last command only — `bad | good` returns 0 - `set -o pipefail` fails if ANY fails — but can't tell which