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 Utility to create EXT2 filesystems.
226 The minix filesystem is a nice, small, compact, read-write filesystem
227 with little overhead. If you wish to be able to create minix
228 filesystems this utility will do the job for you.
230 comment "Minix filesystem support"
231 depends on FSCK_MINIX || MKFS_MINIX
233 config FEATURE_MINIX2
234 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
236 depends on FSCK_MINIX || MKFS_MINIX
238 If you wish to be able to create version 2 minix filesystems, enable
239 this. If you enabled 'mkfs_minix' then you almost certainly want to
240 be using the version 2 filesystem support.
246 Utility to create ReiserFS filesystems.
252 Utility to create FAT32 filesystems.
258 The getopt utility is used to break up (parse) options in command
259 lines to make it easy to write complex shell scripts that also check
260 for legal (and illegal) options. If you want to write horribly
261 complex shell scripts, or use some horribly complex shell script
262 written by others, this utility may be for you. Most people will
263 wisely leave this disabled.
265 config FEATURE_GETOPT_LONG
266 bool "Support option -l"
267 default y if LONG_OPTS
270 Enable support for long options (option -l).
276 The hexdump utility is used to display binary data in a readable
277 way that is comparable to the output from most hex editors.
279 config FEATURE_HEXDUMP_REVERSE
280 bool "Support -R, reverse of 'hexdump -Cv'"
284 The hexdump utility is used to display binary data in an ascii
285 readable way. This option creates binary data from an ascii input.
286 NB: this option is non-standard. It's unwise to use it in scripts
287 aimed to be portable.
294 hd is an alias to hexdump -C.
300 The hwclock utility is used to read and set the hardware clock
301 on a system. This is primarily used to set the current time on
302 shutdown in the hardware clock, so the hardware will keep the
303 correct time when Linux is _not_ running.
305 config FEATURE_HWCLOCK_LONG_OPTIONS
306 bool "Support long options (--hctosys,...)"
308 depends on HWCLOCK && LONG_OPTS
310 By default, the hwclock utility only uses short options. If you
311 are overly fond of its long options, such as --hctosys, --utc, etc)
312 then enable this option.
314 config FEATURE_HWCLOCK_ADJTIME_FHS
315 bool "Use FHS /var/lib/hwclock/adjtime"
319 Starting with FHS 2.3, the adjtime state file is supposed to exist
320 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
321 to use the FHS behavior, answer Y here, otherwise answer N for the
322 classic /etc/adjtime path.
324 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
331 The ipcrm utility allows the removal of System V interprocess
332 communication (IPC) objects and the associated data structures
340 The ipcs utility is used to provide information on the currently
341 allocated System V interprocess (IPC) objects in the system.
347 losetup is used to associate or detach a loop device with a regular
348 file or block device, and to query the status of a loop device. This
349 version does not currently support enabling data encryption.
355 lspci is a utility for displaying information about PCI buses in the
356 system and devices connected to them.
358 This version uses sysfs (/sys/bus/pci/devices) only.
364 lsusb is a utility for displaying information about USB buses in the
365 system and devices connected to them.
367 This version uses sysfs (/sys/bus/usb/devices) only.
373 mdev is a mini-udev implementation for dynamically creating device
374 nodes in the /dev directory.
376 For more information, please see docs/mdev.txt
378 config FEATURE_MDEV_CONF
379 bool "Support /etc/mdev.conf"
383 Add support for the mdev config file to control ownership and
384 permissions of the device nodes.
386 For more information, please see docs/mdev.txt
388 config FEATURE_MDEV_RENAME
389 bool "Support subdirs/symlinks"
391 depends on FEATURE_MDEV_CONF
393 Add support for renaming devices and creating symlinks.
395 For more information, please see docs/mdev.txt
397 config FEATURE_MDEV_RENAME_REGEXP
398 bool "Support regular expressions substitutions when renaming device"
400 depends on FEATURE_MDEV_RENAME
402 Add support for regular expressions substitutions when renaming
405 config FEATURE_MDEV_EXEC
406 bool "Support command execution at device addition/removal"
408 depends on FEATURE_MDEV_CONF
410 This adds support for an optional field to /etc/mdev.conf for
411 executing commands when devices are created/removed.
413 For more information, please see docs/mdev.txt
415 config FEATURE_MDEV_LOAD_FIRMWARE
416 bool "Support loading of firmwares"
420 Some devices need to load firmware before they can be usable.
422 These devices will request userspace look up the files in
423 /lib/firmware/ and if it exists, send it to the kernel for
424 loading into the hardware.
430 The mkswap utility is used to configure a file or disk partition as
431 Linux swap space. This allows Linux to use the entire file or
432 partition as if it were additional RAM, which can greatly increase
433 the capability of low-memory machines. This additional memory is
434 much slower than real RAM, but can be very helpful at preventing your
435 applications being killed by the Linux out of memory (OOM) killer.
436 Once you have created swap space using 'mkswap' you need to enable
437 the swap space using the 'swapon' utility.
439 config FEATURE_MKSWAP_UUID
444 Generate swap spaces with universally unique identifiers.
450 more is a simple utility which allows you to read text one screen
451 sized page at a time. If you want to read text that is larger than
452 the screen, and you are using anything faster than a 300 baud modem,
453 you will probably find this utility very helpful. If you don't have
454 any need to reading text files, you can leave this disabled.
456 config FEATURE_USE_TERMIOS
457 bool "Use termios to manipulate the screen"
459 depends on MORE || TOP
461 This option allows utilities such as 'more' and 'top' to determine
462 the size of the screen. If you leave this disabled, your utilities
463 that display things on the screen will be especially primitive and
464 will be unable to determine the current screen size, and will be
465 unable to move the cursor.
468 bool #No description makes it a hidden option
471 config FEATURE_VOLUMEID_EXT
472 bool "Ext filesystem"
478 config FEATURE_VOLUMEID_BTRFS
479 bool "btrfs filesystem"
485 config FEATURE_VOLUMEID_REISERFS
486 bool "Reiser filesystem"
492 config FEATURE_VOLUMEID_FAT
493 bool "fat filesystem"
499 config FEATURE_VOLUMEID_HFS
500 bool "hfs filesystem"
506 config FEATURE_VOLUMEID_JFS
507 bool "jfs filesystem"
513 ### config FEATURE_VOLUMEID_UFS
514 ### bool "ufs filesystem"
516 ### depends on VOLUMEID
520 config FEATURE_VOLUMEID_XFS
521 bool "xfs filesystem"
527 config FEATURE_VOLUMEID_NTFS
528 bool "ntfs filesystem"
534 config FEATURE_VOLUMEID_ISO9660
535 bool "iso9660 filesystem"
541 config FEATURE_VOLUMEID_UDF
542 bool "udf filesystem"
548 config FEATURE_VOLUMEID_LUKS
549 bool "luks filesystem"
555 config FEATURE_VOLUMEID_LINUXSWAP
556 bool "linux swap filesystem"
562 ### config FEATURE_VOLUMEID_LVM
565 ### depends on VOLUMEID
569 config FEATURE_VOLUMEID_CRAMFS
570 bool "cramfs filesystem"
576 ### config FEATURE_VOLUMEID_HPFS
577 ### bool "hpfs filesystem"
579 ### depends on VOLUMEID
583 config FEATURE_VOLUMEID_ROMFS
584 bool "romfs filesystem"
590 config FEATURE_VOLUMEID_SYSV
591 bool "sysv filesystem"
597 ### config FEATURE_VOLUMEID_MINIX
598 ### bool "minix filesystem"
600 ### depends on VOLUMEID
604 ### These only detect partition tables - not used (yet?)
605 ### config FEATURE_VOLUMEID_MAC
606 ### bool "mac filesystem"
608 ### depends on VOLUMEID
612 ### config FEATURE_VOLUMEID_MSDOS
613 ### bool "msdos filesystem"
615 ### depends on VOLUMEID
619 config FEATURE_VOLUMEID_OCFS2
620 bool "ocfs2 filesystem"
626 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
627 ### bool "highpoint raid"
629 ### depends on VOLUMEID
633 ### config FEATURE_VOLUMEID_ISWRAID
634 ### bool "intel raid"
636 ### depends on VOLUMEID
640 ### config FEATURE_VOLUMEID_LSIRAID
643 ### depends on VOLUMEID
647 ### config FEATURE_VOLUMEID_VIARAID
650 ### depends on VOLUMEID
654 ### config FEATURE_VOLUMEID_SILICONRAID
655 ### bool "silicon raid"
657 ### depends on VOLUMEID
661 ### config FEATURE_VOLUMEID_NVIDIARAID
662 ### bool "nvidia raid"
664 ### depends on VOLUMEID
668 ### config FEATURE_VOLUMEID_PROMISERAID
669 ### bool "promise raid"
671 ### depends on VOLUMEID
675 config FEATURE_VOLUMEID_LINUXRAID
686 All files and filesystems in Unix are arranged into one big directory
687 tree. The 'mount' utility is used to graft a filesystem onto a
688 particular part of the tree. A filesystem can either live on a block
689 device, or it can be accessible over the network, as is the case with
690 NFS filesystems. Most people using BusyBox will also want to enable
693 config FEATURE_MOUNT_FAKE
694 bool "Support option -f"
698 Enable support for faking a file system mount.
700 config FEATURE_MOUNT_VERBOSE
701 bool "Support option -v"
705 Enable multi-level -v[vv...] verbose messages. Useful if you
706 debug mount problems and want to see what is exactly passed
709 config FEATURE_MOUNT_HELPERS
710 bool "Support mount helpers"
714 Enable mounting of virtual file systems via external helpers.
715 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
716 "obexfs -b00.11.22.33.44.55 /mnt"
717 Also "mount -t sometype [-o opts] fs /mnt" will try
718 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
719 The idea is to use such virtual filesystems in /etc/fstab.
721 config FEATURE_MOUNT_LABEL
722 bool "Support specifiying devices by label or UUID"
727 This allows for specifying a device by label or uuid, rather than by
728 name. This feature utilizes the same functionality as blkid/findfs.
729 This also enables label or uuid support for swapon.
731 config FEATURE_MOUNT_NFS
732 bool "Support mounting NFS file systems"
735 select FEATURE_HAVE_RPC
736 select FEATURE_SYSLOG
738 Enable mounting of NFS file systems.
740 config FEATURE_MOUNT_CIFS
741 bool "Support mounting CIFS/SMB file systems"
745 Enable support for samba mounts.
747 config FEATURE_MOUNT_FLAGS
749 bool "Support lots of -o flags in mount"
752 Without this, mount only supports ro/rw/remount. With this, it
753 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
754 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
755 private, unbindable, rshared, rslave, rprivate, and runbindable.
757 config FEATURE_MOUNT_FSTAB
759 bool "Support /etc/fstab and -a"
762 Support mount all and looking for files in /etc/fstab.
768 The pivot_root utility swaps the mount points for the root filesystem
769 with some other mounted filesystem. This allows you to do all sorts
770 of wild and crazy things with your Linux system and is far more
771 powerful than 'chroot'.
773 Note: This is for initrd in linux 2.4. Under initramfs (introduced
774 in linux 2.6) use switch_root instead.
780 The rdate utility allows you to synchronize the date and time of your
781 system clock with the date and time of a remote networked system using
782 the RFC868 protocol, which is built into the inetd daemon on most
789 Print the device node associated with the filesystem mounted at '/'.
795 This allows you to parse /proc/profile for basic profiling.
801 Enter a system sleep state until specified wakeup time.
807 The script makes typescript of terminal session.
813 This program replays a typescript, using timing information
820 The linux32 utility is used to create a 32bit environment for the
821 specified program (usually a shell). It only makes sense to have
822 this util on a system that supports both 64bit and 32bit userland
823 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
829 This option enables both the 'swapon' and the 'swapoff' utilities.
830 Once you have created some swap space using 'mkswap', you also need
831 to enable your swap space with the 'swapon' utility. The 'swapoff'
832 utility is used, typically at system shutdown, to disable any swap
833 space. If you are not using any swap space, you can leave this
836 config FEATURE_SWAPON_PRI
837 bool "Support priority option -p"
841 Enable support for setting swap device priority in swapon.
847 The switch_root utility is used from initramfs to select a new
848 root device. Under initramfs, you have to use this instead of
849 pivot_root. (Stop reading here if you don't care why.)
851 Booting with initramfs extracts a gzipped cpio archive into rootfs
852 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
853 or unmounted*, pivot_root will not work from initramfs. Instead,
854 switch_root deletes everything out of rootfs (including itself),
855 does a mount --move that overmounts rootfs with the new root, and
856 then execs the specified init program.
858 * Because the Linux kernel uses rootfs internally as the starting
859 and ending point for searching through the kernel's doubly linked
860 list of active mount points. That's why.
866 When you want to remove a mounted filesystem from its current mount
867 point, for example when you are shutting down the system, the
868 'umount' utility is the tool to use. If you enabled the 'mount'
869 utility, you almost certainly also want to enable 'umount'.
871 config FEATURE_UMOUNT_ALL
872 bool "Support option -a"
876 Support -a option to unmount all currently mounted filesystems.
878 comment "Common options for mount/umount"
879 depends on MOUNT || UMOUNT
881 config FEATURE_MOUNT_LOOP
882 bool "Support loopback mounts"
884 depends on MOUNT || UMOUNT
886 Enabling this feature allows automatic mounting of files (containing
887 filesystem images) via the linux kernel's loopback devices.
888 The mount command will detect you are trying to mount a file instead
889 of a block device, and transparently associate the file with a
890 loopback device. The umount command will also free that loopback
893 You can still use the 'losetup' utility (to manually associate files
894 with loop devices) if you need to do something advanced, such as
895 specify an offset or cryptographic options to the loopback device.
896 (If you don't want umount to free the loop device, use "umount -D".)
898 config FEATURE_MTAB_SUPPORT
899 bool "Support for the old /etc/mtab file"
901 depends on MOUNT || UMOUNT
902 select FEATURE_MOUNT_FAKE
904 Historically, Unix systems kept track of the currently mounted
905 partitions in the file "/etc/mtab". These days, the kernel exports
906 the list of currently mounted partitions in "/proc/mounts", rendering
907 the old mtab file obsolete. (In modern systems, /etc/mtab should be
908 a symlink to /proc/mounts.)
910 The only reason to have mount maintain an /etc/mtab file itself is if
911 your stripped-down embedded system does not have a /proc directory.
912 If you must use this, keep in mind it's inherently brittle (for
913 example a mount under chroot won't update it), can't handle modern
914 features like separate per-process filesystem namespaces, requires
915 that your /etc directory be writeable, tends to get easily confused
916 by --bind or --move mounts, won't update if you rename a directory
917 that contains a mount point, and so on. (In brief: avoid.)
919 About the only reason to use this is if you've removed /proc from