printenv [-a] [name ...] printenv -e [-guid guid][-n] [name]
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.
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 =>
UEFI variables are only supported if CONFIG_CMD_NVEDIT_EFI=y. The value of UEFI variables can only be displayed if CONFIG_HEXDUMP=y.
The return value