Flag for Exiting on Errors (set -e)
TLDR: set -e is not full proof and comes with caveats.
Arguments against set -e
Example
✅ Basic example works well
set -e
foo() {
echo "This is foo; returns 1 (unhappy)"
return 1
}
main() {
foo
echo.green "MAIN FINISHED! (after foo calls)"
}
main "${@}"
m:mac d:kotlin-mp b:master ○❯sr
This is foo; returns 1 (unhappy)
m:mac d:kotlin-mp b:master ○❯
❌ Checking for success of funcion prevents 'set -e' trigger on failure.
set -e
foo() {
echo "This is foo; returns 1 (unhappy)"
return 1
}
main() {
foo && echo "Foo succeeded!"
echo.green "MAIN FINISHED! (after foo calls)"
}
main "${@}"
m:mac d:kotlin-mp b:master ○❯sr
This is foo; returns 1 (unhappy)
MAIN FINISHED! (after foo calls)
m:mac d:kotlin-mp b:master ○❯
❌ 'local' used on the same line will prevent 'set -e' from aborting
From ❌ 'local' used on the same line with function call will prevent 'set -e' from aborting script
Go to text →
set -e
foo() {
echo "This is foo; returns 1 (unhappy)"
return 1
}
main() {
echo "Calling foo()"
# We succeed because of 'local' being used on the same line as the function call.
local foo_capture="$(foo)"
echo "After foo()"
echo.green "MAIN FINISHED! (after foo calls), foo_capture=[${foo_capture}]"
}
main "${@}"
Output:
m:mac d:kotlin-mp b:master ○❯sr
Calling foo()
After foo()
MAIN FINISHED! (after foo calls), foo_capture=[This is foo; returns 1 (unhappy)]
m:mac d:kotlin-mp b:master ○❯
IF we were to split up declaration of foo_capture into
local foo_capture
foo_capture="$(foo)"
Then set -e would trigger and script would stop.
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