How can I make Powershell behave like Bash with its flag set -e? set -o errexit makes a Bash script "Exit immediately if a simple command exits with a non-zero status".

I thought I could do this by setting $ErrorActionPreference="Stop" but this doesn't seem to work. Suppose I have a script a.ps1

$ErrorActionPreference="Stop"
& cmd /c "exit 1"
echo "cmd exited `$LastExitCode=$LastExitCode and `$?=$?"

If I run it

.\a. ; echo "a.ps1 exited `$LastExitCode=$LastExitCode `$?=$?"

To my surprises it prints

cmd exited $LastExitCode=1 and $?=False
a.ps1 exited $LastExitCode=1 $?=True

What's going on?! I expected a.ps1 to exit after the first line, throwing an error and setting $? to False.

Is there any official documentation explaining $ErrorActionPreference? All I found was this post on a blog about coffee.

.net bash powershell
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