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commit 60fa280715c15c67216a432ef5d81539f7527b69
Author: Junbo Zheng <zhengjun...@xiaomi.com>
AuthorDate: Mon Jan 29 19:32:58 2024 +0800
Documentation: add `expr` command description
Reference: https://github.com/apache/nuttx-apps/pull/2268
Signed-off-by: Junbo Zheng <zhengjun...@xiaomi.com>
---
Documentation/applications/nsh/commands.rst | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/Documentation/applications/nsh/commands.rst
b/Documentation/applications/nsh/commands.rst
index 1f97661bd6..834daf8e8f 100644
--- a/Documentation/applications/nsh/commands.rst
+++ b/Documentation/applications/nsh/commands.rst
@@ -503,6 +503,34 @@ examples:
The ``export`` command is not supported by NSH unless both
``CONFIG_NSH_VARS=y`` and ``CONFIG_DISABLE_ENVIRON``\ is not set.
+.. _cmdexpr:
+
+``expr`` Evaluate expressions
+=============================
+
+**Command Syntax**::
+
+ expr <operand1> <operator> <operand2>
+
+**Synopsis**. It is a mini version for the expr command, which implements the
+features of addition, subtraction, multiplication, division and mod.
+
+**Examples**:
+
+ nsh> expr 5 - 2
+ 3
+ nsh> set hello 10
+ nsh> expr $hello - 2
+ 8
+ nsh> expr 8 a 9
+ Unknown operator
+ nsh> expr 20 / 5
+ 4
+ nsh> expr 10 % 4
+ 2
+ nsh> expr 100 + 0
+ 100
+
.. _cmdfree:
``free`` Show Memory Manager Status
