I've spent some quality time searching the POSIX standard for the shell for the source and . commands, and am at this point convinced that they're just not in there.

Are there any shells that don't support the .? What is the POSIX-standard way of executing a shell script in the current environment (i.e., not spawning a subshell, so if the script says export VAR=value then VAR exists in the calling shell)?

I might be missing something obvious, but it turns out that . is not very easy to Google...

shell unix posix
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