kernel-dev: common: migrate bitbake -e to bitbake-getvar

It's recommended to use bitbake-getvar for a few releases now so let's
use that instead of bitbake -e.

While at it, use a cross-reference for "OpenEmbedded Build System".

(From yocto-docs rev: 29836a95c01cdb99c38802f55a92f32377b8c524)

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 54585646d8220f8de1ba2c7246cb3f2fcbc59583)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/documentation/kernel-dev/common.rst b/documentation/kernel-dev/common.rst
index 9ff6ec221b..c0df39e391 100644
--- a/documentation/kernel-dev/common.rst
+++ b/documentation/kernel-dev/common.rst
@@ -1433,15 +1433,13 @@ Expanding Variables
 ===================
 
 Sometimes it is helpful to determine what a variable expands to during a
-build. You can examine the values of variables by examining the
-output of the ``bitbake -e`` command. The output is long and is more
-easily managed in a text file, which allows for easy searches::
+build. You can examine the value of a variable by running the ``bitbake-getvar``
+command::
 
-   $ bitbake -e virtual/kernel > some_text_file
+   $ bitbake-getvar -r virtual/kernel VARIABLE
 
-Within the text file, you can see
-exactly how each variable is expanded and used by the OpenEmbedded build
-system.
+The output of the command explains exactly how the variable is expanded and used
+by the :term:`OpenEmbedded Build System`.
 
 Working with a "Dirty" Kernel Version String
 ============================================