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- .. SPDX-License-Identifier: GPL-2.0+:
- printenv command
- ================
- Synopsis
- --------
- ::
- printenv [-a] [name ...]
- printenv -e [-guid guid][-n] [name]
- Description
- -----------
- The printenv command is used to print environment or UEFI variables.
- \-a
- Print environment variables starting with a period ('.').
- \-e
- Print UEFI variables. Without -e environment variables are printed.
- \-guid *guid*
- Specify vendor GUID *guid*. If none is specified, all UEFI variables with
- the specified name are printed irrespective of their vendor GUID.
- \-n
- don't show hexadecimal dump of value
- name
- Variable name. If no name is provided, all variables are printed.
- Multiple environment variable names may be specified.
- Examples
- --------
- The following examples demonstrates the effect of the *-a* flag when displaying
- environment variables:
- ::
- => setenv .foo bar
- => printenv
- arch=sandbox
- baudrate=115200
- board=sandbox
- ...
- stdout=serial,vidconsole
- Environment size: 644/8188 bytes
- => printenv -a
- .foo=bar
- arch=sandbox
- baudrate=115200
- board=sandbox
- ...
- stdout=serial,vidconsole
- Environment size: 653/8188 bytes
- =>
- The next example shows the effect of the *-n* flag when displaying an UEFI
- variable and how to specify a vendor GUID:
- ::
- => printenv -e -guid 8be4df61-93ca-11d2-aa0d-00e098032b8c PlatformLangCodes
- PlatformLangCodes:
- 8be4df61-93ca-11d2-aa0d-00e098032b8c (EFI_GLOBAL_VARIABLE_GUID)
- BS|RT|RO, DataSize = 0x6
- 00000000: 65 6e 2d 55 53 00 en-US.
- => printenv -e -n PlatformLangCodes
- PlatformLangCodes:
- 8be4df61-93ca-11d2-aa0d-00e098032b8c (EFI_GLOBAL_VARIABLE_GUID)
- BS|RT|RO, DataSize = 0x6
- =>
- Configuration
- -------------
- UEFI variables are only supported if CONFIG_CMD_NVEDIT_EFI=y. The value of UEFI
- variables can only be displayed if CONFIG_HEXDUMP=y.
- Return value
- ------------
- The return value $? is 1 (false) if a specified variable is not found.
- Otherwise $? is set to 0 (true).
|
