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 The getopt utility is used to break up (parse) options in command
241 lines to make it easy to write complex shell scripts that also check
242 for legal (and illegal) options. If you want to write horribly
243 complex shell scripts, or use some horribly complex shell script
244 written by others, this utility may be for you. Most people will
245 wisely leave this disabled.
251 The hexdump utility is used to display binary data in a readable
252 way that is comparable to the output from most hex editors.
254 config FEATURE_HEXDUMP_REVERSE
255 bool "Support -R, reverse of 'hexdump -Cv'"
259 The hexdump utility is used to display binary data in an ascii
260 readable way. This option creates binary data from an ascii input.
261 NB: this option is non-standard. It's unwise to use it in scripts
262 aimed to be portable.
269 hd is an alias to hexdump -C.
275 The hwclock utility is used to read and set the hardware clock
276 on a system. This is primarily used to set the current time on
277 shutdown in the hardware clock, so the hardware will keep the
278 correct time when Linux is _not_ running.
280 config FEATURE_HWCLOCK_LONG_OPTIONS
281 bool "Support long options (--hctosys,...)"
283 depends on HWCLOCK && GETOPT_LONG
285 By default, the hwclock utility only uses short options. If you
286 are overly fond of its long options, such as --hctosys, --utc, etc)
287 then enable this option.
289 config FEATURE_HWCLOCK_ADJTIME_FHS
290 bool "Use FHS /var/lib/hwclock/adjtime"
294 Starting with FHS 2.3, the adjtime state file is supposed to exist
295 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
296 to use the FHS behavior, answer Y here, otherwise answer N for the
297 classic /etc/adjtime path.
299 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
306 The ipcrm utility allows the removal of System V interprocess
307 communication (IPC) objects and the associated data structures
315 The ipcs utility is used to provide information on the currently
316 allocated System V interprocess (IPC) objects in the system.
322 losetup is used to associate or detach a loop device with a regular
323 file or block device, and to query the status of a loop device. This
324 version does not currently support enabling data encryption.
330 mdev is a mini-udev implementation for dynamically creating device
331 nodes in the /dev directory.
333 For more information, please see docs/mdev.txt
335 config FEATURE_MDEV_CONF
336 bool "Support /etc/mdev.conf"
340 Add support for the mdev config file to control ownership and
341 permissions of the device nodes.
343 For more information, please see docs/mdev.txt
345 config FEATURE_MDEV_RENAME
346 bool "Support subdirs/symlinks"
348 depends on FEATURE_MDEV_CONF
350 Add support for renaming devices and creating symlinks.
352 For more information, please see docs/mdev.txt
354 config FEATURE_MDEV_RENAME_REGEXP
355 bool "Support regular expressions substitutions when renaming device"
357 depends on FEATURE_MDEV_RENAME
359 Add support for regular expressions substitutions when renaming
362 config FEATURE_MDEV_EXEC
363 bool "Support command execution at device addition/removal"
365 depends on FEATURE_MDEV_CONF
367 This adds support for an optional field to /etc/mdev.conf for
368 executing commands when devices are created/removed.
370 For more information, please see docs/mdev.txt
372 config FEATURE_MDEV_LOAD_FIRMWARE
373 bool "Support loading of firmwares"
377 Some devices need to load firmware before they can be usable.
379 These devices will request userspace look up the files in
380 /lib/firmware/ and if it exists, send it to the kernel for
381 loading into the hardware.
387 The mkswap utility is used to configure a file or disk partition as
388 Linux swap space. This allows Linux to use the entire file or
389 partition as if it were additional RAM, which can greatly increase
390 the capability of low-memory machines. This additional memory is
391 much slower than real RAM, but can be very helpful at preventing your
392 applications being killed by the Linux out of memory (OOM) killer.
393 Once you have created swap space using 'mkswap' you need to enable
394 the swap space using the 'swapon' utility.
396 config FEATURE_MKSWAP_V0
397 bool "Version 0 support"
400 # depends on MKSWAP && DEPRECATED
402 Enable support for the old v0 style.
403 If your kernel is older than 2.1.117, then v0 support is the
410 more is a simple utility which allows you to read text one screen
411 sized page at a time. If you want to read text that is larger than
412 the screen, and you are using anything faster than a 300 baud modem,
413 you will probably find this utility very helpful. If you don't have
414 any need to reading text files, you can leave this disabled.
416 config FEATURE_USE_TERMIOS
417 bool "Use termios to manipulate the screen"
419 depends on MORE || TOP
421 This option allows utilities such as 'more' and 'top' to determine
422 the size of the screen. If you leave this disabled, your utilities
423 that display things on the screen will be especially primitive and
424 will be unable to determine the current screen size, and will be
425 unable to move the cursor.
428 bool #No description makes it a hidden option
431 config FEATURE_VOLUMEID_EXT
432 bool "Ext filesystem"
438 config FEATURE_VOLUMEID_REISERFS
439 bool "Reiser filesystem"
445 config FEATURE_VOLUMEID_FAT
446 bool "fat filesystem"
452 config FEATURE_VOLUMEID_HFS
453 bool "hfs filesystem"
459 config FEATURE_VOLUMEID_JFS
460 bool "jfs filesystem"
466 ### config FEATURE_VOLUMEID_UFS
467 ### bool "ufs filesystem"
469 ### depends on VOLUMEID
473 config FEATURE_VOLUMEID_XFS
474 bool "xfs filesystem"
480 config FEATURE_VOLUMEID_NTFS
481 bool "ntfs filesystem"
487 config FEATURE_VOLUMEID_ISO9660
488 bool "iso9660 filesystem"
494 config FEATURE_VOLUMEID_UDF
495 bool "udf filesystem"
501 config FEATURE_VOLUMEID_LUKS
502 bool "luks filesystem"
508 config FEATURE_VOLUMEID_LINUXSWAP
509 bool "linux swap filesystem"
515 ### config FEATURE_VOLUMEID_LVM
518 ### depends on VOLUMEID
522 config FEATURE_VOLUMEID_CRAMFS
523 bool "cramfs filesystem"
529 ### config FEATURE_VOLUMEID_HPFS
530 ### bool "hpfs filesystem"
532 ### depends on VOLUMEID
536 config FEATURE_VOLUMEID_ROMFS
537 bool "romfs filesystem"
543 config FEATURE_VOLUMEID_SYSV
544 bool "sysv filesystem"
550 ### config FEATURE_VOLUMEID_MINIX
551 ### bool "minix filesystem"
553 ### depends on VOLUMEID
557 ### These only detect partition tables - not used (yet?)
558 ### config FEATURE_VOLUMEID_MAC
559 ### bool "mac filesystem"
561 ### depends on VOLUMEID
565 ### config FEATURE_VOLUMEID_MSDOS
566 ### bool "msdos filesystem"
568 ### depends on VOLUMEID
572 config FEATURE_VOLUMEID_OCFS2
573 bool "ocfs2 filesystem"
579 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
580 ### bool "highpoint raid"
582 ### depends on VOLUMEID
586 ### config FEATURE_VOLUMEID_ISWRAID
587 ### bool "intel raid"
589 ### depends on VOLUMEID
593 ### config FEATURE_VOLUMEID_LSIRAID
596 ### depends on VOLUMEID
600 ### config FEATURE_VOLUMEID_VIARAID
603 ### depends on VOLUMEID
607 ### config FEATURE_VOLUMEID_SILICONRAID
608 ### bool "silicon raid"
610 ### depends on VOLUMEID
614 ### config FEATURE_VOLUMEID_NVIDIARAID
615 ### bool "nvidia raid"
617 ### depends on VOLUMEID
621 ### config FEATURE_VOLUMEID_PROMISERAID
622 ### bool "promise raid"
624 ### depends on VOLUMEID
628 config FEATURE_VOLUMEID_LINUXRAID
639 All files and filesystems in Unix are arranged into one big directory
640 tree. The 'mount' utility is used to graft a filesystem onto a
641 particular part of the tree. A filesystem can either live on a block
642 device, or it can be accessible over the network, as is the case with
643 NFS filesystems. Most people using BusyBox will also want to enable
646 config FEATURE_MOUNT_FAKE
647 bool "Support option -f"
651 Enable support for faking a file system mount.
653 config FEATURE_MOUNT_VERBOSE
654 bool "Support option -v"
658 Enable multi-level -v[vv...] verbose messages. Useful if you
659 debug mount problems and want to see what is exactly passed
662 config FEATURE_MOUNT_HELPERS
663 bool "Support mount helpers"
667 Enable mounting of virtual file systems via external helpers.
668 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
669 "obexfs -b00.11.22.33.44.55 /mnt"
670 Also "mount -t sometype [-o opts] fs /mnt" will try
671 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
672 The idea is to use such virtual filesystems in /etc/fstab.
674 config FEATURE_MOUNT_LABEL
675 bool "Support specifiying devices by label or UUID"
680 This allows for specifying a device by label or uuid, rather than by
681 name. This feature utilizes the same functionality as blkid/findfs.
683 config FEATURE_MOUNT_NFS
684 bool "Support mounting NFS file systems"
687 select FEATURE_HAVE_RPC
688 select FEATURE_SYSLOG
690 Enable mounting of NFS file systems.
692 config FEATURE_MOUNT_CIFS
693 bool "Support mounting CIFS/SMB file systems"
697 Enable support for samba mounts.
699 config FEATURE_MOUNT_FLAGS
701 bool "Support lots of -o flags in mount"
704 Without this, mount only supports ro/rw/remount. With this, it
705 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
706 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
707 private, unbindable, rshared, rslave, rprivate, and runbindable.
709 config FEATURE_MOUNT_FSTAB
711 bool "Support /etc/fstab and -a"
714 Support mount all and looking for files in /etc/fstab.
720 The pivot_root utility swaps the mount points for the root filesystem
721 with some other mounted filesystem. This allows you to do all sorts
722 of wild and crazy things with your Linux system and is far more
723 powerful than 'chroot'.
725 Note: This is for initrd in linux 2.4. Under initramfs (introduced
726 in linux 2.6) use switch_root instead.
732 The rdate utility allows you to synchronize the date and time of your
733 system clock with the date and time of a remote networked system using
734 the RFC868 protocol, which is built into the inetd daemon on most
741 Print the device node associated with the filesystem mounted at '/'.
747 This allows you to parse /proc/profile for basic profiling.
753 Enter a system sleep state until specified wakeup time.
759 The script makes typescript of terminal session.
765 The linux32 utility is used to create a 32bit environment for the
766 specified program (usually a shell). It only makes sense to have
767 this util on a system that supports both 64bit and 32bit userland
768 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
774 This option enables both the 'swapon' and the 'swapoff' utilities.
775 Once you have created some swap space using 'mkswap', you also need
776 to enable your swap space with the 'swapon' utility. The 'swapoff'
777 utility is used, typically at system shutdown, to disable any swap
778 space. If you are not using any swap space, you can leave this
781 config FEATURE_SWAPON_PRI
782 bool "Support priority option -p"
786 Enable support for setting swap device priority in swapon.
792 The switch_root utility is used from initramfs to select a new
793 root device. Under initramfs, you have to use this instead of
794 pivot_root. (Stop reading here if you don't care why.)
796 Booting with initramfs extracts a gzipped cpio archive into rootfs
797 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
798 or unmounted*, pivot_root will not work from initramfs. Instead,
799 switch_root deletes everything out of rootfs (including itself),
800 does a mount --move that overmounts rootfs with the new root, and
801 then execs the specified init program.
803 * Because the Linux kernel uses rootfs internally as the starting
804 and ending point for searching through the kernel's doubly linked
805 list of active mount points. That's why.
811 When you want to remove a mounted filesystem from its current mount
812 point, for example when you are shutting down the system, the
813 'umount' utility is the tool to use. If you enabled the 'mount'
814 utility, you almost certainly also want to enable 'umount'.
816 config FEATURE_UMOUNT_ALL
817 bool "Support option -a"
821 Support -a option to unmount all currently mounted filesystems.
823 comment "Common options for mount/umount"
824 depends on MOUNT || UMOUNT
826 config FEATURE_MOUNT_LOOP
827 bool "Support loopback mounts"
829 depends on MOUNT || UMOUNT
831 Enabling this feature allows automatic mounting of files (containing
832 filesystem images) via the linux kernel's loopback devices.
833 The mount command will detect you are trying to mount a file instead
834 of a block device, and transparently associate the file with a
835 loopback device. The umount command will also free that loopback
838 You can still use the 'losetup' utility (to manually associate files
839 with loop devices) if you need to do something advanced, such as
840 specify an offset or cryptographic options to the loopback device.
841 (If you don't want umount to free the loop device, use "umount -D".)
843 config FEATURE_MTAB_SUPPORT
844 bool "Support for the old /etc/mtab file"
846 depends on MOUNT || UMOUNT
847 select FEATURE_MOUNT_FAKE
849 Historically, Unix systems kept track of the currently mounted
850 partitions in the file "/etc/mtab". These days, the kernel exports
851 the list of currently mounted partitions in "/proc/mounts", rendering
852 the old mtab file obsolete. (In modern systems, /etc/mtab should be
853 a symlink to /proc/mounts.)
855 The only reason to have mount maintain an /etc/mtab file itself is if
856 your stripped-down embedded system does not have a /proc directory.
857 If you must use this, keep in mind it's inherently brittle (for
858 example a mount under chroot won't update it), can't handle modern
859 features like separate per-process filesystem namespaces, requires
860 that your /etc directory be writeable, tends to get easily confused
861 by --bind or --move mounts, won't update if you rename a directory
862 that contains a mount point, and so on. (In brief: avoid.)
864 About the only reason to use this is if you've removed /proc from