mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 06:12:58 +00:00
89 lines
1.8 KiB
ReStructuredText
89 lines
1.8 KiB
ReStructuredText
.. 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.
|
|
|
|
See also *env ask* in :doc:`env`.
|
|
|
|
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).
|