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doc: usage: Add general rule for $?

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For nearly all commands in U-Boot the '?' variable is handled the same
way with 0 meaning success, 1 meaning any failure.  Explain this in the
general rules section of the cmdline documentation (with a link to a
counter example) and then remove the redundant wording from most
commands. We retain a section about the return value in a number of
places where we are doing something such as always returning a specific
value or we have useful additional information to go along with the
normal return codes.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Tom Rini
2025-10-24 10:02:57 -06:00
parent 1f6da608c3
commit 11da3403e9
45 changed files with 6 additions and 245 deletions
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6
doc/usage/cmd/part.rst
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@@ -223,9 +223,3 @@ This shows looking at a device with multiple partition tables::
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: a0891d7e-b930-4513-94da-f629dbd637b2
=>
Return value
------------
The return value $? is set to 0 (true) if the command succededd. If an
error occurs, the return value $? is set to 1 (false).