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KENV(1) General Commands Manual KENV(1) NAME kenv -- list or modify the kernel environment SYNOPSIS kenv [-l | -s] [-hNq] kenv [-qv] variable[=value] kenv [-q] -u variable DESCRIPTION The kenv utility will list all variables in the kernel environment if in- voked without arguments. If the -l option is specified, then the static environment provided by loader(8) will be listed instead. Similarly, the -s option will list the static environment defined by the kernel config. Both of the -l and -s op- tions are dependent on the kernel being configured to preserve early kernel environments. The default kernel configuration does not preserve these en- vironments. If the -h option is specified, it will limit the report to kernel probe hints. If an optional variable name is specified, kenv will only report that value. If the -N option is specified, kenv will only display variable names and not their values. If the -u option is specified, kenv will delete the given environment variable. If the environment variable is fol- lowed by an optional value, kenv will set the environment variable to this value. If the -q option is set, warnings normally printed as a result of being un- able to perform the requested operation will be suppressed. If the -v option is set, the variable name will be printed out for the en- vironment variable in addition to the value when kenv is executed with a variable name. Variables can be added to the kernel environment using the /boot/loader.conf file, or also statically compiled into the kernel using the statement env filename in the kernel config file. The file can contain lines of the form name = value # this is a comment where whitespace around `name' and `=', and everything after a `#' charac- ter, are ignored. Almost any printable character except `=' is acceptable as part of a name. Quotes are optional and necessary only if the value contains whitespace. EXAMPLES Show kernel probe hints variable names and filter for the uart device $ kenv -h -N | grep uart hint.uart.0.at hint.uart.0.flags hint.uart.0.irq hint.uart.0.port hint.uart.1.at hint.uart.1.irq hint.uart.1.port Show the value of a specific variable: $ kenv hint.uart.1.at isa Same as above but adding the name of the variable in the report: $ kenv -v hint.uart.1.at hint.uart.1.at="isa" Try to delete a variable and suppress warnings if any: $ kenv -q -u hint.uart.1.at Set the value of the verbose_loading variable $ kenv verbose_loading="YES" verbose_loading="YES" SEE ALSO kenv(2), config(5), loader.conf(5), loader(8) HISTORY The kenv utility appeared in FreeBSD 4.1.1. FreeBSD 15.0 June 20, 2021 KENV(1)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY
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