2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Linux System Utilities"
12 acpid listens to ACPI events coming either in textual form from
13 /proc/acpi/event (though it is marked deprecated it is still widely
14 used and _is_ a standard) or in binary form from specified evdevs
15 (just use /dev/input/event*).
17 It parses the event to retrieve ACTION and a possible PARAMETER.
18 It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
19 (if the resulting path is a directory) or directly as an executable.
21 N.B. acpid relies on run-parts so have the latter installed.
23 config FEATURE_ACPID_COMPAT
24 bool "Accept and ignore redundant options"
28 Accept and ignore compatibility options -g -m -s -S -v.
35 Lists labels and UUIDs of all filesystems.
37 With all submodules selected, it will add ~8k to busybox.
43 dmesg is used to examine or control the kernel ring buffer. When the
44 Linux kernel prints messages to the system log, they are stored in
45 the kernel ring buffer. You can use dmesg to print the kernel's ring
46 buffer, clear the kernel ring buffer, change the size of the kernel
47 ring buffer, and change the priority level at which kernel messages
48 are also logged to the system console. Enable this option if you
49 wish to enable the 'dmesg' utility.
51 config FEATURE_DMESG_PRETTY
52 bool "Pretty dmesg output"
56 If you wish to scrub the syslog level from the output, say 'Y' here.
57 The syslog level is a string prefixed to every line with the form
60 With this option you will see:
62 Linux version 2.6.17.4 .....
63 BIOS-provided physical RAM map:
64 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
66 Without this option you will see:
68 <5>Linux version 2.6.17.4 .....
69 <6>BIOS-provided physical RAM map:
70 <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
76 fbset is used to show or change the settings of a Linux frame buffer
77 device. The frame buffer device provides a simple and unique
78 interface to access a graphics display. Enable this option
79 if you wish to enable the 'fbset' utility.
81 config FEATURE_FBSET_FANCY
82 bool "Turn on extra fbset options"
86 This option enables extended fbset options, allowing one to set the
87 framebuffer size, color depth, etc. interface to access a graphics
88 display. Enable this option if you wish to enable extended fbset
91 config FEATURE_FBSET_READMODE
92 bool "Turn on fbset readmode support"
96 This option allows fbset to read the video mode database stored by
97 default as /etc/fb.modes, which can be used to set frame buffer
98 device to pre-defined video modes.
104 fdflush is only needed when changing media on slightly-broken
105 removable media drives. It is used to make Linux believe that a
106 hardware disk-change switch has been actuated, which causes Linux to
107 forget anything it has cached from the previous media. If you have
108 such a slightly-broken drive, you will need to run fdflush every time
109 you change a disk. Most people have working hardware and can safely
116 fdformat is used to low-level format a floppy disk.
122 The fdisk utility is used to divide hard disks into one or more
123 logical disks, which are generally called partitions. This utility
124 can be used to list and edit the set of partitions or BSD style
125 'disk slices' that are defined on a hard drive.
127 config FDISK_SUPPORT_LARGE_DISKS
128 bool "Support over 4GB disks"
132 Enable this option to support large disks > 4GB.
134 config FEATURE_FDISK_WRITABLE
139 Enabling this option allows you to create or change a partition table
140 and write those changes out to disk. If you leave this option
141 disabled, you will only be able to view the partition table.
143 config FEATURE_AIX_LABEL
144 bool "Support AIX disklabels"
146 depends on FDISK && FEATURE_FDISK_WRITABLE
148 Enabling this option allows you to create or change AIX disklabels.
149 Most people can safely leave this option disabled.
151 config FEATURE_SGI_LABEL
152 bool "Support SGI disklabels"
154 depends on FDISK && FEATURE_FDISK_WRITABLE
156 Enabling this option allows you to create or change SGI disklabels.
157 Most people can safely leave this option disabled.
159 config FEATURE_SUN_LABEL
160 bool "Support SUN disklabels"
162 depends on FDISK && FEATURE_FDISK_WRITABLE
164 Enabling this option allows you to create or change SUN disklabels.
165 Most people can safely leave this option disabled.
167 config FEATURE_OSF_LABEL
168 bool "Support BSD disklabels"
170 depends on FDISK && FEATURE_FDISK_WRITABLE
172 Enabling this option allows you to create or change BSD disklabels
173 and define and edit BSD disk slices.
175 config FEATURE_FDISK_ADVANCED
176 bool "Support expert mode"
178 depends on FDISK && FEATURE_FDISK_WRITABLE
180 Enabling this option allows you to do terribly unsafe things like
181 define arbitrary drive geometry, move the beginning of data in a
182 partition, and similarly evil things. Unless you have a very good
183 reason you would be wise to leave this disabled.
190 Prints the name of a filesystem with given label or UUID.
192 With all submodules selected, it will add ~8k to busybox.
198 Linux allows you to create ramdisks. This utility allows you to
199 delete them and completely free all memory that was used for the
200 ramdisk. For example, if you boot Linux into a ramdisk and later
201 pivot_root, you may want to free the memory that is allocated to the
202 ramdisk. If you have no use for freeing memory from a ramdisk, leave
209 The minix filesystem is a nice, small, compact, read-write filesystem
210 with little overhead. It is not a journaling filesystem however and
211 can experience corruption if it is not properly unmounted or if the
212 power goes off in the middle of a write. This utility allows you to
213 check for and attempt to repair any corruption that occurs to a minix
220 The minix filesystem is a nice, small, compact, read-write filesystem
221 with little overhead. If you wish to be able to create minix
222 filesystems this utility will do the job for you.
224 comment "Minix filesystem support"
225 depends on FSCK_MINIX || MKFS_MINIX
227 config FEATURE_MINIX2
228 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
230 depends on FSCK_MINIX || MKFS_MINIX
232 If you wish to be able to create version 2 minix filesystems, enable
233 this. If you enabled 'mkfs_minix' then you almost certainly want to
234 be using the version 2 filesystem support.
240 Utility to create FAT32 filesystems.
246 The getopt utility is used to break up (parse) options in command
247 lines to make it easy to write complex shell scripts that also check
248 for legal (and illegal) options. If you want to write horribly
249 complex shell scripts, or use some horribly complex shell script
250 written by others, this utility may be for you. Most people will
251 wisely leave this disabled.
257 The hexdump utility is used to display binary data in a readable
258 way that is comparable to the output from most hex editors.
260 config FEATURE_HEXDUMP_REVERSE
261 bool "Support -R, reverse of 'hexdump -Cv'"
265 The hexdump utility is used to display binary data in an ascii
266 readable way. This option creates binary data from an ascii input.
267 NB: this option is non-standard. It's unwise to use it in scripts
268 aimed to be portable.
275 hd is an alias to hexdump -C.
281 The hwclock utility is used to read and set the hardware clock
282 on a system. This is primarily used to set the current time on
283 shutdown in the hardware clock, so the hardware will keep the
284 correct time when Linux is _not_ running.
286 config FEATURE_HWCLOCK_LONG_OPTIONS
287 bool "Support long options (--hctosys,...)"
289 depends on HWCLOCK && GETOPT_LONG
291 By default, the hwclock utility only uses short options. If you
292 are overly fond of its long options, such as --hctosys, --utc, etc)
293 then enable this option.
295 config FEATURE_HWCLOCK_ADJTIME_FHS
296 bool "Use FHS /var/lib/hwclock/adjtime"
300 Starting with FHS 2.3, the adjtime state file is supposed to exist
301 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
302 to use the FHS behavior, answer Y here, otherwise answer N for the
303 classic /etc/adjtime path.
305 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
312 The ipcrm utility allows the removal of System V interprocess
313 communication (IPC) objects and the associated data structures
321 The ipcs utility is used to provide information on the currently
322 allocated System V interprocess (IPC) objects in the system.
328 losetup is used to associate or detach a loop device with a regular
329 file or block device, and to query the status of a loop device. This
330 version does not currently support enabling data encryption.
336 lspci is a utility for displaying information about PCI buses in the
337 system and devices connected to them.
339 This version uses sysfs (/sys/bus/pci/devices) only.
345 lsusb is a utility for displaying information about USB buses in the
346 system and devices connected to them.
348 This version uses sysfs (/sys/bus/usb/devices) only.
354 mdev is a mini-udev implementation for dynamically creating device
355 nodes in the /dev directory.
357 For more information, please see docs/mdev.txt
359 config FEATURE_MDEV_CONF
360 bool "Support /etc/mdev.conf"
364 Add support for the mdev config file to control ownership and
365 permissions of the device nodes.
367 For more information, please see docs/mdev.txt
369 config FEATURE_MDEV_RENAME
370 bool "Support subdirs/symlinks"
372 depends on FEATURE_MDEV_CONF
374 Add support for renaming devices and creating symlinks.
376 For more information, please see docs/mdev.txt
378 config FEATURE_MDEV_RENAME_REGEXP
379 bool "Support regular expressions substitutions when renaming device"
381 depends on FEATURE_MDEV_RENAME
383 Add support for regular expressions substitutions when renaming
386 config FEATURE_MDEV_EXEC
387 bool "Support command execution at device addition/removal"
389 depends on FEATURE_MDEV_CONF
391 This adds support for an optional field to /etc/mdev.conf for
392 executing commands when devices are created/removed.
394 For more information, please see docs/mdev.txt
396 config FEATURE_MDEV_LOAD_FIRMWARE
397 bool "Support loading of firmwares"
401 Some devices need to load firmware before they can be usable.
403 These devices will request userspace look up the files in
404 /lib/firmware/ and if it exists, send it to the kernel for
405 loading into the hardware.
411 The mkswap utility is used to configure a file or disk partition as
412 Linux swap space. This allows Linux to use the entire file or
413 partition as if it were additional RAM, which can greatly increase
414 the capability of low-memory machines. This additional memory is
415 much slower than real RAM, but can be very helpful at preventing your
416 applications being killed by the Linux out of memory (OOM) killer.
417 Once you have created swap space using 'mkswap' you need to enable
418 the swap space using the 'swapon' utility.
420 config FEATURE_MKSWAP_V0
421 bool "Version 0 support"
424 # depends on MKSWAP && DEPRECATED
426 Enable support for the old v0 style.
427 If your kernel is older than 2.1.117, then v0 support is the
434 more is a simple utility which allows you to read text one screen
435 sized page at a time. If you want to read text that is larger than
436 the screen, and you are using anything faster than a 300 baud modem,
437 you will probably find this utility very helpful. If you don't have
438 any need to reading text files, you can leave this disabled.
440 config FEATURE_USE_TERMIOS
441 bool "Use termios to manipulate the screen"
443 depends on MORE || TOP
445 This option allows utilities such as 'more' and 'top' to determine
446 the size of the screen. If you leave this disabled, your utilities
447 that display things on the screen will be especially primitive and
448 will be unable to determine the current screen size, and will be
449 unable to move the cursor.
452 bool #No description makes it a hidden option
455 config FEATURE_VOLUMEID_EXT
456 bool "Ext filesystem"
462 config FEATURE_VOLUMEID_REISERFS
463 bool "Reiser filesystem"
469 config FEATURE_VOLUMEID_FAT
470 bool "fat filesystem"
476 config FEATURE_VOLUMEID_HFS
477 bool "hfs filesystem"
483 config FEATURE_VOLUMEID_JFS
484 bool "jfs filesystem"
490 ### config FEATURE_VOLUMEID_UFS
491 ### bool "ufs filesystem"
493 ### depends on VOLUMEID
497 config FEATURE_VOLUMEID_XFS
498 bool "xfs filesystem"
504 config FEATURE_VOLUMEID_NTFS
505 bool "ntfs filesystem"
511 config FEATURE_VOLUMEID_ISO9660
512 bool "iso9660 filesystem"
518 config FEATURE_VOLUMEID_UDF
519 bool "udf filesystem"
525 config FEATURE_VOLUMEID_LUKS
526 bool "luks filesystem"
532 config FEATURE_VOLUMEID_LINUXSWAP
533 bool "linux swap filesystem"
539 ### config FEATURE_VOLUMEID_LVM
542 ### depends on VOLUMEID
546 config FEATURE_VOLUMEID_CRAMFS
547 bool "cramfs filesystem"
553 ### config FEATURE_VOLUMEID_HPFS
554 ### bool "hpfs filesystem"
556 ### depends on VOLUMEID
560 config FEATURE_VOLUMEID_ROMFS
561 bool "romfs filesystem"
567 config FEATURE_VOLUMEID_SYSV
568 bool "sysv filesystem"
574 ### config FEATURE_VOLUMEID_MINIX
575 ### bool "minix filesystem"
577 ### depends on VOLUMEID
581 ### These only detect partition tables - not used (yet?)
582 ### config FEATURE_VOLUMEID_MAC
583 ### bool "mac filesystem"
585 ### depends on VOLUMEID
589 ### config FEATURE_VOLUMEID_MSDOS
590 ### bool "msdos filesystem"
592 ### depends on VOLUMEID
596 config FEATURE_VOLUMEID_OCFS2
597 bool "ocfs2 filesystem"
603 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
604 ### bool "highpoint raid"
606 ### depends on VOLUMEID
610 ### config FEATURE_VOLUMEID_ISWRAID
611 ### bool "intel raid"
613 ### depends on VOLUMEID
617 ### config FEATURE_VOLUMEID_LSIRAID
620 ### depends on VOLUMEID
624 ### config FEATURE_VOLUMEID_VIARAID
627 ### depends on VOLUMEID
631 ### config FEATURE_VOLUMEID_SILICONRAID
632 ### bool "silicon raid"
634 ### depends on VOLUMEID
638 ### config FEATURE_VOLUMEID_NVIDIARAID
639 ### bool "nvidia raid"
641 ### depends on VOLUMEID
645 ### config FEATURE_VOLUMEID_PROMISERAID
646 ### bool "promise raid"
648 ### depends on VOLUMEID
652 config FEATURE_VOLUMEID_LINUXRAID
663 All files and filesystems in Unix are arranged into one big directory
664 tree. The 'mount' utility is used to graft a filesystem onto a
665 particular part of the tree. A filesystem can either live on a block
666 device, or it can be accessible over the network, as is the case with
667 NFS filesystems. Most people using BusyBox will also want to enable
670 config FEATURE_MOUNT_FAKE
671 bool "Support option -f"
675 Enable support for faking a file system mount.
677 config FEATURE_MOUNT_VERBOSE
678 bool "Support option -v"
682 Enable multi-level -v[vv...] verbose messages. Useful if you
683 debug mount problems and want to see what is exactly passed
686 config FEATURE_MOUNT_HELPERS
687 bool "Support mount helpers"
691 Enable mounting of virtual file systems via external helpers.
692 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
693 "obexfs -b00.11.22.33.44.55 /mnt"
694 Also "mount -t sometype [-o opts] fs /mnt" will try
695 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
696 The idea is to use such virtual filesystems in /etc/fstab.
698 config FEATURE_MOUNT_LABEL
699 bool "Support specifiying devices by label or UUID"
704 This allows for specifying a device by label or uuid, rather than by
705 name. This feature utilizes the same functionality as blkid/findfs.
706 This also enables label or uuid support for swapon.
708 config FEATURE_MOUNT_NFS
709 bool "Support mounting NFS file systems"
712 select FEATURE_HAVE_RPC
713 select FEATURE_SYSLOG
715 Enable mounting of NFS file systems.
717 config FEATURE_MOUNT_CIFS
718 bool "Support mounting CIFS/SMB file systems"
722 Enable support for samba mounts.
724 config FEATURE_MOUNT_FLAGS
726 bool "Support lots of -o flags in mount"
729 Without this, mount only supports ro/rw/remount. With this, it
730 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
731 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
732 private, unbindable, rshared, rslave, rprivate, and runbindable.
734 config FEATURE_MOUNT_FSTAB
736 bool "Support /etc/fstab and -a"
739 Support mount all and looking for files in /etc/fstab.
745 The pivot_root utility swaps the mount points for the root filesystem
746 with some other mounted filesystem. This allows you to do all sorts
747 of wild and crazy things with your Linux system and is far more
748 powerful than 'chroot'.
750 Note: This is for initrd in linux 2.4. Under initramfs (introduced
751 in linux 2.6) use switch_root instead.
757 The rdate utility allows you to synchronize the date and time of your
758 system clock with the date and time of a remote networked system using
759 the RFC868 protocol, which is built into the inetd daemon on most
766 Print the device node associated with the filesystem mounted at '/'.
772 This allows you to parse /proc/profile for basic profiling.
778 Enter a system sleep state until specified wakeup time.
784 The script makes typescript of terminal session.
790 The linux32 utility is used to create a 32bit environment for the
791 specified program (usually a shell). It only makes sense to have
792 this util on a system that supports both 64bit and 32bit userland
793 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
799 This option enables both the 'swapon' and the 'swapoff' utilities.
800 Once you have created some swap space using 'mkswap', you also need
801 to enable your swap space with the 'swapon' utility. The 'swapoff'
802 utility is used, typically at system shutdown, to disable any swap
803 space. If you are not using any swap space, you can leave this
806 config FEATURE_SWAPON_PRI
807 bool "Support priority option -p"
811 Enable support for setting swap device priority in swapon.
817 The switch_root utility is used from initramfs to select a new
818 root device. Under initramfs, you have to use this instead of
819 pivot_root. (Stop reading here if you don't care why.)
821 Booting with initramfs extracts a gzipped cpio archive into rootfs
822 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
823 or unmounted*, pivot_root will not work from initramfs. Instead,
824 switch_root deletes everything out of rootfs (including itself),
825 does a mount --move that overmounts rootfs with the new root, and
826 then execs the specified init program.
828 * Because the Linux kernel uses rootfs internally as the starting
829 and ending point for searching through the kernel's doubly linked
830 list of active mount points. That's why.
836 When you want to remove a mounted filesystem from its current mount
837 point, for example when you are shutting down the system, the
838 'umount' utility is the tool to use. If you enabled the 'mount'
839 utility, you almost certainly also want to enable 'umount'.
841 config FEATURE_UMOUNT_ALL
842 bool "Support option -a"
846 Support -a option to unmount all currently mounted filesystems.
848 comment "Common options for mount/umount"
849 depends on MOUNT || UMOUNT
851 config FEATURE_MOUNT_LOOP
852 bool "Support loopback mounts"
854 depends on MOUNT || UMOUNT
856 Enabling this feature allows automatic mounting of files (containing
857 filesystem images) via the linux kernel's loopback devices.
858 The mount command will detect you are trying to mount a file instead
859 of a block device, and transparently associate the file with a
860 loopback device. The umount command will also free that loopback
863 You can still use the 'losetup' utility (to manually associate files
864 with loop devices) if you need to do something advanced, such as
865 specify an offset or cryptographic options to the loopback device.
866 (If you don't want umount to free the loop device, use "umount -D".)
868 config FEATURE_MTAB_SUPPORT
869 bool "Support for the old /etc/mtab file"
871 depends on MOUNT || UMOUNT
872 select FEATURE_MOUNT_FAKE
874 Historically, Unix systems kept track of the currently mounted
875 partitions in the file "/etc/mtab". These days, the kernel exports
876 the list of currently mounted partitions in "/proc/mounts", rendering
877 the old mtab file obsolete. (In modern systems, /etc/mtab should be
878 a symlink to /proc/mounts.)
880 The only reason to have mount maintain an /etc/mtab file itself is if
881 your stripped-down embedded system does not have a /proc directory.
882 If you must use this, keep in mind it's inherently brittle (for
883 example a mount under chroot won't update it), can't handle modern
884 features like separate per-process filesystem namespaces, requires
885 that your /etc directory be writeable, tends to get easily confused
886 by --bind or --move mounts, won't update if you rename a directory
887 that contains a mount point, and so on. (In brief: avoid.)
889 About the only reason to use this is if you've removed /proc from