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