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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2020-02-21 11:13:52 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-02-21 17:59:39 +0300 |
| commit | 5f811c57c99205e048926293bb812c750a6ea562 (patch) | |
| tree | c5d42ee18f3be934f401afb43894bc8203b9623a /Documentation/admin-guide | |
| parent | 4e4694d8729f7cd6381f6691e8f83e378fce3160 (diff) | |
| download | linux-5f811c57c99205e048926293bb812c750a6ea562.tar.xz | |
bootconfig: Add append value operator support
Add append value operator "+=" support to bootconfig syntax.
With this operator, user can add new value to the key as
an entry of array instead of overwriting.
For example,
foo = bar
...
foo += baz
Then the key "foo" has "bar" and "baz" values as an array.
Link: http://lkml.kernel.org/r/158227283195.12842.8310503105963275584.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/bootconfig.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/admin-guide/bootconfig.rst b/Documentation/admin-guide/bootconfig.rst index 57119fb69d36..cf2edcd09183 100644 --- a/Documentation/admin-guide/bootconfig.rst +++ b/Documentation/admin-guide/bootconfig.rst @@ -71,7 +71,15 @@ For example,:: foo = bar, baz foo = qux # !ERROR! we can not re-define same key -Also, a sub-key and a value can not co-exist under a parent key. +If you want to append the value to existing key as an array member, +you can use ``+=`` operator. For example:: + + foo = bar, baz + foo += qux + +In this case, the key ``foo`` has ``bar``, ``baz`` and ``qux``. + +However, a sub-key and a value can not co-exist under a parent key. For example, following config is NOT allowed.:: foo = value1 |