diff --git a/doc/usage/askenv.rst b/doc/usage/askenv.rst new file mode 100644 index 0000000000..5c4ca35d4c --- /dev/null +++ b/doc/usage/askenv.rst @@ -0,0 +1,87 @@ +.. SPDX-License-Identifier: GPL-2.0+: + +askenv command +=============== + +Synopsis +-------- + +:: + + askenv name [message] [size] + +Description +----------- + +Display message and get environment variable name of max size characters +from stdin. + +name + name of the environment variable + +message + message is displayed while the command waits for the value to be + entered from stdin.if no message is specified,a default message + "Please enter name:" will be displayed. + +size + maximum number of characters that will be stored in environment + variable name.this is in decimal number format (unlike in + other commands where size values are in hexa-decimal). Default + value of size is 1023 (CONFIG_SYS_CBSIZE - 1). + +Example +------- + +Value of a environment variable env1 without message and size parameters: + +:: + + => askenv env1;echo $? + Please enter 'env1': val1 + 0 + => printenv env1 + env1=val1 + +Value of a environment variable env2 with message and size parameters: + +:: + + => askenv env2 Please type-in a value for env2: 10;echo $? + Please type-in a value for env2: 1234567890123 + 0 + => printenv env2 + env2=1234567890 + +Value of a environment variable env3 with size parameter only: + +:: + + => askenv env3 10;echo $? + Please enter 'env3': val3 + 0 + => printenv env3 + env3=val3 + +Return Value of askenv command, when used without any other arguments: + +:: + + => askenv;echo $? + askenv - get environment variables from stdin + + Usage: + askenv name [message] [size] + - display 'message' and get environment variable 'name' from stdin (max 'size' chars) + 1 + +Configuration +------------- + +The askenv command is only available if CMD_ASKENV=y + +Return value +------------ + +The return value $? is set to 0 (true). +If no other arguments are specified (along with askenv), it is set to 1 (false). diff --git a/doc/usage/index.rst b/doc/usage/index.rst index 843b4371f1..40b796a3a9 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -17,6 +17,7 @@ Shell commands :maxdepth: 1 addrmap + askenv base bootefi booti