[Bug 214933] [patch] bsdinstall: add support for "hidden" Wi-Fi networks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214933

--- Comment #13 from Devin Teske <dteske at FreeBSD.org> ---
(In reply to Maxim Filimonov from comment #10)

The following:
        ENCRYPTION=$( ... \
                ... )
        [ $? -eq 0 ] || exit 1

Should be instead:
        ENCRYPTION=$( ... \
                ... ) || exit

This is building upon:

a. exit when not given a value, retains the previous status
NOTE: This allows the [meaningful] exit status of dialog(1) to be exposed
instead of being overwritten to one (1)
b. The exit status of VAR=$( ... ) is the exit status of "..." in the sub-shell
NOTE: This allows us to combine the VAR=$( ... ) and the exit-status test, ala
VAR=$( ... ) || exit

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