From be47d58313f553c6a6b057ec9554a1a67480e102 Mon Sep 17 00:00:00 2001
From: Andrey Borzenkov <arvidjaar@gmail.com>
Date: Fri, 5 Apr 2013 10:18:42 +0200
Subject: [PATCH 258/482] * docs/grub.texi: Document more user commands.
---
ChangeLog | 4 +
docs/grub.texi | 352 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 347 insertions(+), 9 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 6113a39..d63c0e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2013-04-04 Andrey Borzenkov <arvidjaar@gmail.com>
+
+ * docs/grub.texi: Document more user commands.
+
2013-04-04 Andrey Borzenkov <arvidjaar@gmail.com>
* docs/grub.texi: Document menuentry --id option.
diff --git a/docs/grub.texi b/docs/grub.texi
index 742d406..bd366a6 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -1554,6 +1554,10 @@ Causes a function to exit with the return value specified by @code{n}. If
in the function body. If used outside a function the return status is
false.
+@item setparams [@code{arg}] @dots{}
+Replace positional parameters starting with @code{$1} with arguments to
+@command{setparams}.
+
@item shift [@code{n}]
The positional parameters from @code{n}+1 @dots{} are renamed to
@code{$1}@dots{}. Parameters represented by the numbers @code{$#} down to
@@ -1751,8 +1755,8 @@ Colors can be specified in several ways:
The fonts GRUB uses ``PFF2 font format'' bitmap fonts. Fonts are specified
with full font names. Currently there is no
provision for a preference list of fonts, or deriving one font from another.
-Fonts are loaded with the ``loadfont'' command in GRUB. To see the list of
-loaded fonts, execute the ``lsfonts'' command. If there are too many fonts to
+Fonts are loaded with the ``loadfont'' command in GRUB (@ref{loadfont}). To see the list of
+loaded fonts, execute the ``lsfonts'' command (@ref{lsfonts}). If there are too many fonts to
fit on screen, do ``set pager=1'' before executing ``lsfonts''.
@@ -3365,16 +3369,25 @@ you forget a command, you can run the command @command{help}
(@pxref{help}).
@menu
+* [:: Check file types and compare values
* acpi:: Load ACPI tables
+* authenticate:: Check whether user is in user list
+* background_color:: Set background color for active terminal
+* background_image:: Load background image for active terminal
* badram:: Filter out bad regions of RAM
* blocklist:: Print a block list
* boot:: Start up your operating system
* cat:: Show the contents of a file
* chainloader:: Chain-load another boot loader
+* clear:: Clear the screen
+* cmosclean:: Clear bit in CMOS
+* cmosdump:: Dump CMOS contents
+* cmostest:: Test bit in CMOS
* cmp:: Compare two files
* configfile:: Load a configuration file
* cpuid:: Check for CPU features
-* crc:: Calculate CRC32 checksums
+* crc:: Compute or check CRC32 checksums
+* cryptomount:: Mount a crypto device
* date:: Display or set current date and time
* drivemap:: Map a drive to another
* echo:: Display a line of text
@@ -3383,6 +3396,7 @@ you forget a command, you can run the command @command{help}
* gettext:: Translate a string
* gptsync:: Fill an MBR based on GPT entries
* halt:: Shut down your computer
+* hashsum:: Compute or check hash checksum
* help:: Show help messages
* initrd:: Load a Linux initrd
* initrd16:: Load a Linux initrd (16-bit mode)
@@ -3391,29 +3405,50 @@ you forget a command, you can run the command @command{help}
* linux:: Load a Linux kernel
* linux16:: Load a Linux kernel (16-bit mode)
* list_env:: List variables in environment block
+* loadfont:: Load font files
* load_env:: Load variables from environment block
* loopback:: Make a device from a filesystem image
* ls:: List devices or files
+* lsfonts:: List loaded fonts
+* lsmod:: Show loaded modules
+* md5sum:: Compute or check MD5 hash
* normal:: Enter normal mode
* normal_exit:: Exit from normal mode
* parttool:: Modify partition table entries
* password:: Set a clear-text password
* password_pbkdf2:: Set a hashed password
* play:: Play a tune
+* probe:: Retrieve device info
* pxe_unload:: Unload the PXE environment
* read:: Read user input
* reboot:: Reboot your computer
+* regexp:: Test if regular expression matches string
+* rmmod:: Remove a module
* save_env:: Save variables to environment block
* search:: Search devices by file, label, or UUID
* sendkey:: Emulate keystrokes
* set:: Set an environment variable
+* sha1sum:: Compute or check SHA1 hash
+* sha256sum:: Compute or check SHA256 hash
+* sha512sum:: Compute or check SHA512 hash
+* sleep:: Wait for a specified number of seconds
* source:: Read a configuration file in same context
+* test:: Check file types and compare values
* true:: Do nothing, successfully
* unset:: Unset an environment variable
* uppermem:: Set the upper memory size
+@comment * vbeinfo:: List available video modes
+* videoinfo:: List available video modes
@end menu
+@node [
+@subsection [
+@deffn Command @code{[} expression @code{]}
+Alias for @code{test @var{expression}} (@pxref{test}).
+@end deffn
+
+
@node acpi
@subsection acpi
@@ -3435,6 +3470,42 @@ Normally, this command will replace the Root System Description Pointer
GRUB, but may be used by GRUB's EFI emulation.
@end deffn
+
+@node authenticate
+@subsection authenticate
+@deffn Command authenticate [userlist]
+Check whether user is in @var{userlist} or listed in the value of variable
+@samp{superusers}. See @pxref{superusers} for valid user list format.
+If @samp{superusers} is empty, this command returns true. @xref{Security}.
+@end deffn
+
+
+@node background_color
+@subsection background_color
+
+@deffn Command background_color color
+Set background color for active terminal. For valid color specifications see
+@pxref{Theme file format, ,Colors}. Background color can be changed only when
+using @samp{gfxterm} for terminal output.
+
+This command sets color of empty areas without text. Text background color
+is controlled by environment variables @var{color_normal}, @var{color_highlight},
+@var{menu_color_normal}, @var{menu_color_highlight}. @xref{Special environment variables}.
+@end deffn
+
+
+@node background_image
+@subsection background_image
+
+@deffn Command background_image [[@option{--mode} @samp{stretch}|@samp{normal}] file]
+Load background image for active terminal from @var{file}. Image is stretched
+to fill up entire screen unless option @option{--mode} @samp{normal} is given.
+Without arguments remove currently loaded background image. Background image
+can be changed only when using @samp{gfxterm} for terminal output.
+
+@end deffn
+
+
@node badram
@subsection badram
@@ -3507,6 +3578,42 @@ load a defective boot loader, such as SCO UnixWare 7.1.
@end deffn
+@node clear
+@subsection clear
+
+@deffn Command clear
+Clear the screen.
+@end deffn
+
+
+@node cmosclean
+@subsection cmosclean
+
+@deffn Command cmosclean byte:bit
+Clear value of bit in CMOS at location @var{byte}:@var{bit}. This command
+is available only on platforms that support CMOS.
+@end deffn
+
+
+@node cmosdump
+@subsection cmosdump
+
+@deffn Dump CMOS contents
+Dump full CMOS contents as hexadecimal values. This command is available only
+on platforms that support CMOS.
+@end deffn
+
+
+@node cmostest
+@subsection cmostest
+
+@deffn Command cmostest byte:bit
+Test value of bit in CMOS at location @var{byte}:@var{bit}. Exit status
+is zero if bit is set, non zero otherwise. This command is available only
+on platforms that support CMOS.
+@end deffn
+
+
@node cmp
@subsection cmp
@@ -3557,8 +3664,24 @@ invoked with @option{-l}. This may change in the future.
@node crc
@subsection crc
-@deffn Command crc file
-Display the CRC32 checksum of @var{file}.
+@deffn Command crc arg @dots{}
+Alias for @code{hashsum --hash crc32 arg @dots{}}. See command @command{hashsum}
+(@pxref{hashsum}) for full description.
+@end deffn
+
+
+@node cryptomount
+@subsection cryptomount
+
+@deffn Command cryptomount device|@option{-u} uuid|@option{-a}|@option{-b}
+Setup access to encrypted device. If necessary, passphrase
+is requested interactively. Option @var{device} configures specific grub device
+(@pxref{Naming convention}); option @option{-u} @var{uuid} configures device
+with specified @var{uuid}; option @option{-a} configures all detected encrypted
+devices; option @option{-b} configures all geli containers that have boot flag set.
+
+GRUB suports devices encrypted using LUKS and geli. Note that necessary modules (@var{luks} and @var{geli}) have to be loaded manually before this command can
+be used.
@end deffn
@@ -3704,6 +3827,29 @@ is shut down using APM.
@end deffn
+@node hashsum
+@subsection hashsum
+
+@deffn Command hashsum @option{--hash} hash @option{--keep-going} @option{--uncompress} @option{--check} file [@option{--prefix} dir]|file @dots{}
+Compute or verify file hashes. Hash type is selected with option @option{--hash}.
+Supported hashes are: @samp{adler32}, @samp{crc64}, @samp{crc32},
+@samp{crc32rfc1510}, @samp{crc24rfc2440}, @samp{md4}, @samp{md5},
+@samp{ripemd160}, @samp{sha1}, @samp{sha224}, @samp{sha256}, @samp{sha512},
+@samp{sha384}, @samp{tiger192}, @samp{tiger}, @samp{tiger2}, @samp{whirlpool}.
+Option @option{--uncompress} uncompresses files before computing hash.
+
+When list of files is given, hash of each file is computed and printed,
+followed by file name, each file on a new line.
+
+When option @option{--check} is given, it points to a file that contains
+list of @var{hash name} pairs in the same format as used by UNIX
+@command{md5sum} command. Option @option{--prefix}
+may be used to give directory where files are located. Hash verification
+stops after the first mismatch was found unless option @option{--keep-going}
+was given.
+@end deffn
+
+
@node help
@subsection help
@@ -3822,6 +3968,16 @@ block.
@end deffn
+@node loadfont
+@subsection loadfont
+
+@deffn Command loadfont file @dots{}
+Load specified font files. Unless absolute pathname is given, @var{file}
+is assumed to be in directory @samp{$prefix/fonts} with
+suffix @samp{.pf2} appended. @xref{Theme file format,,Fonts}.
+@end deffn
+
+
@node loopback
@subsection loopback
@@ -3855,6 +4011,31 @@ name syntax}), then list the contents of that directory.
@end deffn
+@node lsfonts
+@subsection lsfonts
+
+@deffn Command lsfonts
+List loaded fonts.
+@end deffn
+
+
+@node lsmod
+@subsection lsmod
+
+@deffn Command lsmod
+Show list of loaded modules.
+@end deffn
+
+
+@node md5sum
+@subsection md5sum
+
+@deffn Command md5sum arg @dots{}
+Alias for @code{hashsum --hash md5 arg @dots{}}. See command @command{hashsum}
+(@pxref{hashsum}) for full description.
+@end deffn
+
+
@node normal
@subsection normal
@@ -3940,7 +4121,7 @@ to generate password hashes. @xref{Security}.
@node play
@subsection play
-@deffn Command play file | tempo [pitch1 duration1] [pitch2 duration2] ...
+@deffn Command play file | tempo [pitch1 duration1] [pitch2 duration2] @dots{}
Plays a tune
If the argument is a file name (@pxref{File name syntax}), play the tune
@@ -3956,6 +4137,15 @@ a rest.
@end deffn
+@node probe
+@subsection probe
+
+@deffn Command probe [@option{--set} var] @option{--driver}|@option{--partmap}|@option{--fs}|@option{--fs-uuid}|@option{--label} device
+Retrieve device information. If option @option{--set} is given, assign result
+to variable @var{var}, otherwise print information on the screen.
+@end deffn
+
+
@node pxe_unload
@subsection pxe_unload
@@ -3984,6 +4174,26 @@ Reboot the computer.
@end deffn
+@node regexp
+@subsection regexp
+
+@deffn Command regexp [@option{--set} [number:]var] regexp string
+Test if regular expression @var{regexp} matches @var{string}. Supported
+regular expressions are POSIX.2 Extended Regular Expressions. If option
+@option{--set} is given, store @var{number}th matched subexpression in
+variable @var{var}. Subexpressions are numbered in order of their opening
+parentheses starting from @samp{1}. @var{number} defaults to @samp{1}.
+@end deffn
+
+
+@node rmmod
+@subsection rmmod
+
+@deffn Command rmmod module
+Remove a loaded @var{module}.
+@end deffn
+
+
@node save_env
@subsection save_env
@@ -4176,6 +4386,43 @@ arguments, print all environment variables with their values.
@end deffn
+@node sha1sum
+@subsection sha1sum
+
+@deffn Command sha1sum arg @dots{}
+Alias for @code{hashsum --hash sha1 arg @dots{}}. See command @command{hashsum}
+(@pxref{hashsum}) for full description.
+@end deffn
+
+
+@node sha256sum
+@subsection sha256sum
+
+@deffn Command sha256sum arg @dots{}
+Alias for @code{hashsum --hash sha256 arg @dots{}}. See command @command{hashsum}
+(@pxref{hashsum}) for full description.
+@end deffn
+
+
+@node sha512sum
+@subsection sha512sum
+
+@deffn Command sha512sum arg @dots{}
+Alias for @code{hashsum --hash sha512 arg @dots{}}. See command @command{hashsum}
+(@pxref{hashsum}) for full description.
+@end deffn
+
+
+@node sleep
+@subsection sleep
+
+@deffn Command sleep [@option{--verbose}] [@option{--interruptible}] count
+Sleep for @var{count} seconds. If option @option{--interruptible} is given,
+allow @key{ESC} to interrupt sleep. With @option{--verbose} show countdown
+of remaining seconds.
+@end deffn
+
+
@node source
@subsection source
@@ -4189,6 +4436,74 @@ will not be shown immediately.
@end deffn
+@node test
+@subsection test
+
+@deffn Command test expression
+Evaluate @var{expression} and return zero exit status if result is true,
+non zero status otherwise.
+
+@var{expression} is one of:
+
+@table @asis
+@item @var{string1} @code{==} @var{string2}
+the strings are equal
+@item @var{string1} @code{!=} @var{string2}
+the strings are not equal
+@item @var{string1} @code{<} @var{string2}
+@var{string1} is lexicographically less than @var{string2}
+@item @var{string1} @code{<=} @var{string2}
+@var{string1} is lexicographically less or equal than @var{string2}
+@item @var{string1} @code{>} @var{string2}
+@var{string1} is lexicographically greater than @var{string2}
+@item @var{string1} @code{>=} @var{string2}
+@var{string1} is lexicographically greater or equal than @var{string2}
+@item @var{integer1} @code{-eq} @var{integer2}
+@var{integer1} is equal to @var{integer2}
+@item @var{integer1} @code{-ge} @var{integer2}
+@var{integer1} is greater than or equal to @var{integer2}
+@item @var{integer1} @code{-gt} @var{integer2}
+@var{integer1} is greater than @var{integer2}
+@item @var{integer1} @code{-le} @var{integer2}
+@var{integer1} is less than or equal to @var{integer2}
+@item @var{integer1} @code{-lt} @var{integer2}
+@var{integer1} is less than @var{integer2}
+@item @var{integer1} @code{-ne} @var{integer2}
+@var{integer1} is not equal to @var{integer2}
+@item @var{prefix}@var{integer1} @code{-pgt} @var{prefix}@var{integer2}
+@var{integer1} is greater than @var{integer2} after stripping off common non-numeric @var{prefix}.
+@item @var{prefix}@var{integer1} @code{-plt} @var{prefix}@var{integer2}
+@var{integer1} is less than @var{integer2} after stripping off common non-numeric @var{prefix}.
+@item @var{file1} @code{-nt} @var{file2}
+@var{file1} is newer than @var{file2} (modification time). Optionally numeric @var{bias} may be directly appended to @code{-nt} in which case it is added to the first file modification time.
+@item @var{file1} @code{-ot} @var{file2}
+@var{file1} is older than @var{file2} (modification time). Optionally numeric @var{bias} may be directly appended to @code{-ot} in which case it is added to the first file modification time.
+@item @code{-d} @var{file}
+@var{file} exists and is a directory
+@item @code{-e} @var{file}
+@var{file} exists
+@item @code{-f} @var{file}
+@var{file} exists and is not a directory
+@item @code{-s} @var{file}
+@var{file} exists and has a size greater than zero
+@item @code{-n} @var{string}
+the length of @var{string} is nonzero
+@item @var{string}
+@var{string} is equivalent to @code{-n @var{string}}
+@item @code{-z} @var{string}
+the length of @var{string} is zero
+@item @code{(} @var{expression} @code{)}
+@var{expression} is true
+@item @code{!} @var{expression}
+@var{expression} is false
+@item @var{expression1} @code{-a} @var{expression2}
+both @var{expression1} and @var{expression2} are true
+@item @var{expression1} @code{-o} @var{expression2}
+either @var{expression1} or @var{expression2} is true
+@end table
+@end deffn
+
+
@node true
@subsection true
@@ -4211,6 +4526,25 @@ Unset the environment variable @var{envvar}.
This command is not yet implemented for GRUB 2, although it is planned.
+
+@ignore
+@node vbeinfo
+@subsection vbeinfo
+
+@deffn Command vbeinfo [[WxH]xD]
+Alias for command @command{videoinfo} (@pxref{videoinfo}). It is available
+only on PC BIOS platforms.
+@end deffn
+@end ignore
+
+
+@node videoinfo
+@subsection videoinfo
+
+@deffn Command videoinfo [[WxH]xD]
+List available video modes. If resolution is given, show only matching modes.
+@end deffn
+
@node Internationalisation
@chapter Charset
GRUB uses UTF-8 internally other than in rendering where some GRUB-specific
@@ -4311,7 +4645,7 @@ Identifiers containing non-ASCII may work but aren't supported.
Only the ASCII space characters (space U+0020, tab U+000b, CR U+000d and
LF U+000a) are recognised. Other unicode space characters aren't a valid
field separator.
-@command{test} tests <, >, <=, >=, -pgt and -plt compare the strings in the
+@command{test} (@pxref{test}) tests <, >, <=, >=, -pgt and -plt compare the strings in the
lexicographical order of unicode codepoints, replicating the behaviour of
test from coreutils.
environment variables and commands are listed in the same order.
@@ -4769,8 +5103,8 @@ Installing to the whole disk device is normally more robust.
@item
Check that GRUB actually knows how to read from the device and file system
containing @file{/boot/grub}. It will not be able to read from encrypted
-devices, nor from file systems for which support has not yet been added to
-GRUB.
+devices with unsupported encryption scheme, nor from file systems for which
+support has not yet been added to GRUB.
@end itemize
--
1.8.2.1