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84344f9fbf
assure backward compatibility (conditional on !BURN_BRIDGES), look it up by its old name first, and log a warning (but accept the setting) if it was found. If both the old and new name are defined, the new name takes precedence. Also export vm.kmem_size as a read-only sysctl variable; I find it hard to tune a parameter when I don't know its default value, especially when that default value is computed at boot time.
342 lines
11 KiB
Plaintext
342 lines
11 KiB
Plaintext
################################################################################
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# Thelp DDisplay command help
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help [topic [subtopic]]
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?
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The help command displays help on commands and their usage.
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In command help, a term enclosed with <...> indicates a value as
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described by the term. A term enclosed with [...] is optional,
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and may not be required by all forms of the command.
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Some commands may not be available. Use the '?' command to list
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most available commands.
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If needed, disable the use of ACPI with:
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unset acpi_load
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$hint.acpi.0.disabled="1"
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################################################################################
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# Tautoboot DBoot after a delay
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autoboot [<delay> [<prompt>]]
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Displays <prompt> or a default prompt, and counts down <delay> seconds
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before attempting to boot. If <delay> is not specified, the default
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value is 10.
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################################################################################
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# Tboot DBoot immediately
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boot [<kernelname>] [-<arg> ...]
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Boot the system. If arguments are specified, they are added to the
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arguments for the kernel. If <kernelname> is specified, and a kernel
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has not already been loaded, it will be booted instead of the default
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kernel.
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################################################################################
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# Techo DEcho arguments
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echo [-n] [<message>]
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Emits <message>, with no trailing newline if -n is specified. This is
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most useful in conjunction with scripts and the '@' line prefix.
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Variables are substituted by prefixing them with $, eg.
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echo Current device is $currdev
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will print the current device.
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################################################################################
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# Tload DLoad a kernel or module
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load [-t <type>] <filename>
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Loads the module contained in <filename> into memory. If no other
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modules are loaded, <filename> must be a kernel or the command will
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fail.
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If -t is specified, the module is loaded as raw data of <type>, for
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later use by the kernel or other modules. <type> may be any string.
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################################################################################
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# Tls DList files
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ls [-l] [<path>]
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Displays a listing of files in the directory <path>, or the root
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directory of the current device if <path> is not specified.
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The -l argument displays file sizes as well; the process of obtaining
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file sizes on some media may be very slow.
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################################################################################
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# Tlsdev DList devices
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lsdev [-v]
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List all of the devices from which it may be possible to load modules.
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If -v is specified, print more details.
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################################################################################
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# Tlsmod DList modules
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lsmod [-v]
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List loaded modules. If [-v] is specified, print more details.
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################################################################################
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# Tmore DPage files
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more <filename> [<filename> ...]
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Show contents of text files. When displaying the contents of more,
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than one file, if the user elects to quit displaying a file, the
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remaining files will not be shown.
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################################################################################
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# Tpnpscan DScan for PnP devices
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pnpscan [-v]
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Scan for Plug-and-Play devices. This command is normally automatically
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run as part of the boot process, in order to dynamically load modules
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required for system operation.
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If the -v argument is specified, details on the devices found will
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be printed.
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################################################################################
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# Tset DSet a variable
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set <variable name>
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set <variable name>=<value>
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The set command is used to set variables.
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################################################################################
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# Tset Sautoboot_delay DSet the default autoboot delay
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set autoboot_delay=<value>
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Sets the default delay for the autoboot command to <value> seconds.
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################################################################################
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# Tset Sbootfile DSet the default boot file set
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set bootfile=<filename>[;<filename>...]
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Sets the default set of kernel boot filename(s). It may be overridden
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by setting the bootfile variable to a semicolon-separated list of
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filenames, each of which will be searched for in the module_path
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directories. The default bootfile set is "kernel".
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################################################################################
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# Tset Sboot_askname DPrompt for root device
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set boot_askname
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Instructs the kernel to prompt the user for the name of the root device
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when the kernel is booted.
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################################################################################
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# Tset Sboot_ddb DDrop to the kernel debugger (DDB)
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set boot_ddb
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Instructs the kernel to start in the DDB debugger, rather than
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proceeding to initialise when booted.
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################################################################################
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# Tset Sboot_gdb DSelect gdb-remote mode
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set boot_gdb
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Selects gdb-remote mode for the kernel debugger by default.
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################################################################################
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# Tset Sboot_single DStart system in single-user mode
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set boot_single
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Prevents the kernel from initiating a multi-user startup, single-user
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mode will be entered when the kernel has finished device probes.
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################################################################################
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# Tset Sboot_verbose DVerbose boot messages
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set boot_verbose
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Setting this variable causes extra debugging information to be printed
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by the kernel during the boot phase.
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################################################################################
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# Tset Sconsole DSet the current console
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set console[=<value>]
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Sets the current console. If <value> is omitted, a list of valid
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consoles will be displayed.
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################################################################################
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# Tset Scurrdev DSet the current device
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set currdev=<device>
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Selects the default device. Syntax for devices is odd.
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################################################################################
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# Tset Sinit_path DSet the list of init candidates
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set init_path=<path>[:<path>...]
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Sets the list of binaries which the kernel will try to run as initial
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process.
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################################################################################
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# Tset Smodule_path DSet the module search path
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set module_path=<path>[;<path>...]
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Sets the list of directories which will be searched in for modules
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named in a load command or implicitly required by a dependency. The
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default module_path is "/boot/kernel;/boot/modules".
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################################################################################
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# Tset Sprompt DSet the command prompt
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set prompt=<value>
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The command prompt is displayed when the loader is waiting for input.
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Variable substitution is performed on the prompt. The default
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prompt can be set with:
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set prompt=\$currdev>
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################################################################################
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# Tset Srootdev DSet the root filesystem
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set rootdev=<path>
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By default the value of $currdev is used to set the root filesystem
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when the kernel is booted. This can be overridden by setting
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$rootdev explicitly.
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################################################################################
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# Tset Stunables DSet kernel tunable values
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Various kernel tunable parameters can be overridden by specifying new
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values in the environment.
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set kern.ipc.nmbclusters=<value> NMBCLUSTERS
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Set the number of mbuf clusters to be allocated. The value
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cannot be set below the default determined when the kernel
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was compiled.
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set kern.ipc.nsfbufs=<value> NSFBUFS
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Set the number of sendfile buffers to be allocated. This
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overrides the value determined when the kernel was compiled.
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set vm.kmem_size=<value> VM_KMEM_SIZE
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Sets the size of kernel memory (bytes). This overrides
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the value determined when the kernel was compiled.
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set machdep.disable_mtrrs=1
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Disable the use of i686 MTRRs (i386 only)
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set net.inet.tcp.tcbhashsize=<value> TCBHASHSIZE
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Overrides the compile-time set value of TCBHASHSIZE or
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the preset default of 512. Must be a power of 2.
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hw.syscons.sc_no_suspend_vtswitch=<value>
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Disable VT switching on suspend.
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value is 0 (default) or non-zero to enable.
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set hw.physmem=<value> MAXMEM (i386 only)
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Limits the amount of physical memory space available to
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the system to <value> bytes. <value> may have a k, M or G
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suffix to indicate kilobytes, megabytes and gigabytes
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respectively. Note that the current i386 architecture
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limits this value to 4GB.
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On systems where memory cannot be accurately probed,
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this option provides a hint as to the actual size of
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system memory (which will be tested before use).
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set hw.pci.allow_unsupported_io_range=<value>
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Allow the PCI Bridge to pass through an unsupported
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memory range assigned by the BIOS.
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value is 0 (default) or non-zero to enable.
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set hw.pci.enable_io_modes=<value>
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Enable PCI resources which are left off by some BIOSes
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or are not enabled correctly by the device driver.
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value is 1 (default), but this may cause problems with
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some peripherals. Set to 0 to disable.
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################################################################################
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# Tshow DShow the values of variables
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show [<variable>]
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Displays the value of <variable>, or all variables if not specified.
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Multiple paths can be separated with a semicolon.
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################################################################################
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# Tinclude DRead commands from a script file
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include <filename> [<filename> ...]
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The entire contents of <filename> are read into memory before executing
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commands, so it is safe to source a file from removable media.
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################################################################################
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# Tread DRead input from the terminal
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read [-t <value>] [-p <prompt>] [<variable name>]
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The read command reads a line of input from the terminal. If the
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-t argument is specified, it will return nothing if no input has been
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received after <value> seconds. (Any keypress will cancel the
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timeout).
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If -p is specified, <prompt> is printed before reading input. No
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newline is emitted after the prompt.
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If a variable name is supplied, the variable is set to the value read,
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less any terminating newline.
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################################################################################
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# Tunload DRemove all modules from memory
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unload
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This command removes any kernel and all loaded modules from memory.
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################################################################################
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# Tunset DUnset a variable
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unset <variable name>
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If allowed, the named variable's value is discarded and the variable
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is removed.
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################################################################################
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