unset
To reset one or more environment variables, use the unset command in boot loader mode.
unset variable...
Syntax Description
Use one of these keywords for variable:
MANUAL_BOOT—Specifies whether the device automatically or manually boots.
variable
BOOT—Resets the list of executable files to try to load and execute when automatically
booting. If the BOOT environment variable is not set, the system attempts to load and execute
the first executable image it can find by using a recursive, depth-first search through the
flash: file system. If the BOOT variable is set but the specified images cannot be loaded, the
system attempts to boot the first bootable file that it can find in the flash: file system.
ENABLE_BREAK—Specifies whether the automatic boot process can be interrupted by
using the Break key on the console after the flash: file system has been initialized.
HELPER—Identifies the semicolon-separated list of loadable files to dynamically load
during the boot loader initialization. Helper files extend or patch the functionality of the boot
loader.
PS1—Specifies the string that is used as the command-line prompt in boot loader mode.
CONFIG_FILE—Resets the filename that Cisco IOS uses to read and write a nonvolatile
copy of the system configuration.
BAUD—Resets the rate in bits per second (b/s) used for the console. The Cisco IOS software
inherits the baud rate setting from the boot loader and continues to use this value unless the
configuration file specifies another setting.
Command Default
No default behavior or values.
Command Modes
Boot loader
Command History
ModificationRelease
This command was introduced.Cisco IOS XE 3.3SECisco IOS XE 3.3SE
Usage Guidelines
Under typical circumstances, it is not necessary to alter the setting of the environment variables.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
980
unset
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