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 Utility to create EXT2 filesystems.
252 The getopt utility is used to break up (parse) options in command
253 lines to make it easy to write complex shell scripts that also check
254 for legal (and illegal) options. If you want to write horribly
255 complex shell scripts, or use some horribly complex shell script
256 written by others, this utility may be for you. Most people will
257 wisely leave this disabled.
259 config FEATURE_GETOPT_LONG
260 bool "Support option -l"
261 default y if LONG_OPTS
264 Enable support for long options (option -l).
270 The hexdump utility is used to display binary data in a readable
271 way that is comparable to the output from most hex editors.
273 config FEATURE_HEXDUMP_REVERSE
274 bool "Support -R, reverse of 'hexdump -Cv'"
278 The hexdump utility is used to display binary data in an ascii
279 readable way. This option creates binary data from an ascii input.
280 NB: this option is non-standard. It's unwise to use it in scripts
281 aimed to be portable.
288 hd is an alias to hexdump -C.
294 The hwclock utility is used to read and set the hardware clock
295 on a system. This is primarily used to set the current time on
296 shutdown in the hardware clock, so the hardware will keep the
297 correct time when Linux is _not_ running.
299 config FEATURE_HWCLOCK_LONG_OPTIONS
300 bool "Support long options (--hctosys,...)"
302 depends on HWCLOCK && LONG_OPTS
304 By default, the hwclock utility only uses short options. If you
305 are overly fond of its long options, such as --hctosys, --utc, etc)
306 then enable this option.
308 config FEATURE_HWCLOCK_ADJTIME_FHS
309 bool "Use FHS /var/lib/hwclock/adjtime"
313 Starting with FHS 2.3, the adjtime state file is supposed to exist
314 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
315 to use the FHS behavior, answer Y here, otherwise answer N for the
316 classic /etc/adjtime path.
318 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
325 The ipcrm utility allows the removal of System V interprocess
326 communication (IPC) objects and the associated data structures
334 The ipcs utility is used to provide information on the currently
335 allocated System V interprocess (IPC) objects in the system.
341 losetup is used to associate or detach a loop device with a regular
342 file or block device, and to query the status of a loop device. This
343 version does not currently support enabling data encryption.
349 mdev is a mini-udev implementation for dynamically creating device
350 nodes in the /dev directory.
352 For more information, please see docs/mdev.txt
354 config FEATURE_MDEV_CONF
355 bool "Support /etc/mdev.conf"
359 Add support for the mdev config file to control ownership and
360 permissions of the device nodes.
362 For more information, please see docs/mdev.txt
364 config FEATURE_MDEV_RENAME
365 bool "Support subdirs/symlinks"
367 depends on FEATURE_MDEV_CONF
369 Add support for renaming devices and creating symlinks.
371 For more information, please see docs/mdev.txt
373 config FEATURE_MDEV_RENAME_REGEXP
374 bool "Support regular expressions substitutions when renaming device"
376 depends on FEATURE_MDEV_RENAME
378 Add support for regular expressions substitutions when renaming
381 config FEATURE_MDEV_EXEC
382 bool "Support command execution at device addition/removal"
384 depends on FEATURE_MDEV_CONF
386 This adds support for an optional field to /etc/mdev.conf for
387 executing commands when devices are created/removed.
389 For more information, please see docs/mdev.txt
391 config FEATURE_MDEV_LOAD_FIRMWARE
392 bool "Support loading of firmwares"
396 Some devices need to load firmware before they can be usable.
398 These devices will request userspace look up the files in
399 /lib/firmware/ and if it exists, send it to the kernel for
400 loading into the hardware.
406 The mkswap utility is used to configure a file or disk partition as
407 Linux swap space. This allows Linux to use the entire file or
408 partition as if it were additional RAM, which can greatly increase
409 the capability of low-memory machines. This additional memory is
410 much slower than real RAM, but can be very helpful at preventing your
411 applications being killed by the Linux out of memory (OOM) killer.
412 Once you have created swap space using 'mkswap' you need to enable
413 the swap space using the 'swapon' utility.
415 config FEATURE_MKSWAP_UUID
420 Generate swap spaces with universally unique identifiers.
426 more is a simple utility which allows you to read text one screen
427 sized page at a time. If you want to read text that is larger than
428 the screen, and you are using anything faster than a 300 baud modem,
429 you will probably find this utility very helpful. If you don't have
430 any need to reading text files, you can leave this disabled.
432 config FEATURE_USE_TERMIOS
433 bool "Use termios to manipulate the screen"
435 depends on MORE || TOP
437 This option allows utilities such as 'more' and 'top' to determine
438 the size of the screen. If you leave this disabled, your utilities
439 that display things on the screen will be especially primitive and
440 will be unable to determine the current screen size, and will be
441 unable to move the cursor.
444 bool #No description makes it a hidden option
447 config FEATURE_VOLUMEID_EXT
448 bool "Ext filesystem"
454 config FEATURE_VOLUMEID_BTRFS
455 bool "btrfs filesystem"
461 config FEATURE_VOLUMEID_REISERFS
462 bool "Reiser filesystem"
468 config FEATURE_VOLUMEID_FAT
469 bool "fat filesystem"
475 config FEATURE_VOLUMEID_HFS
476 bool "hfs filesystem"
482 config FEATURE_VOLUMEID_JFS
483 bool "jfs filesystem"
489 ### config FEATURE_VOLUMEID_UFS
490 ### bool "ufs filesystem"
492 ### depends on VOLUMEID
496 config FEATURE_VOLUMEID_XFS
497 bool "xfs filesystem"
503 config FEATURE_VOLUMEID_NTFS
504 bool "ntfs filesystem"
510 config FEATURE_VOLUMEID_ISO9660
511 bool "iso9660 filesystem"
517 config FEATURE_VOLUMEID_UDF
518 bool "udf filesystem"
524 config FEATURE_VOLUMEID_LUKS
525 bool "luks filesystem"
531 config FEATURE_VOLUMEID_LINUXSWAP
532 bool "linux swap filesystem"
538 ### config FEATURE_VOLUMEID_LVM
541 ### depends on VOLUMEID
545 config FEATURE_VOLUMEID_CRAMFS
546 bool "cramfs filesystem"
552 ### config FEATURE_VOLUMEID_HPFS
553 ### bool "hpfs filesystem"
555 ### depends on VOLUMEID
559 config FEATURE_VOLUMEID_ROMFS
560 bool "romfs filesystem"
566 config FEATURE_VOLUMEID_SYSV
567 bool "sysv filesystem"
573 ### config FEATURE_VOLUMEID_MINIX
574 ### bool "minix filesystem"
576 ### depends on VOLUMEID
580 ### These only detect partition tables - not used (yet?)
581 ### config FEATURE_VOLUMEID_MAC
582 ### bool "mac filesystem"
584 ### depends on VOLUMEID
588 ### config FEATURE_VOLUMEID_MSDOS
589 ### bool "msdos filesystem"
591 ### depends on VOLUMEID
595 config FEATURE_VOLUMEID_OCFS2
596 bool "ocfs2 filesystem"
602 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
603 ### bool "highpoint raid"
605 ### depends on VOLUMEID
609 ### config FEATURE_VOLUMEID_ISWRAID
610 ### bool "intel raid"
612 ### depends on VOLUMEID
616 ### config FEATURE_VOLUMEID_LSIRAID
619 ### depends on VOLUMEID
623 ### config FEATURE_VOLUMEID_VIARAID
626 ### depends on VOLUMEID
630 ### config FEATURE_VOLUMEID_SILICONRAID
631 ### bool "silicon raid"
633 ### depends on VOLUMEID
637 ### config FEATURE_VOLUMEID_NVIDIARAID
638 ### bool "nvidia raid"
640 ### depends on VOLUMEID
644 ### config FEATURE_VOLUMEID_PROMISERAID
645 ### bool "promise raid"
647 ### depends on VOLUMEID
651 config FEATURE_VOLUMEID_LINUXRAID
662 All files and filesystems in Unix are arranged into one big directory
663 tree. The 'mount' utility is used to graft a filesystem onto a
664 particular part of the tree. A filesystem can either live on a block
665 device, or it can be accessible over the network, as is the case with
666 NFS filesystems. Most people using BusyBox will also want to enable
669 config FEATURE_MOUNT_FAKE
670 bool "Support option -f"
674 Enable support for faking a file system mount.
676 config FEATURE_MOUNT_VERBOSE
677 bool "Support option -v"
681 Enable multi-level -v[vv...] verbose messages. Useful if you
682 debug mount problems and want to see what is exactly passed
685 config FEATURE_MOUNT_HELPERS
686 bool "Support mount helpers"
690 Enable mounting of virtual file systems via external helpers.
691 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
692 "obexfs -b00.11.22.33.44.55 /mnt"
693 Also "mount -t sometype [-o opts] fs /mnt" will try
694 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
695 The idea is to use such virtual filesystems in /etc/fstab.
697 config FEATURE_MOUNT_LABEL
698 bool "Support specifiying devices by label or UUID"
703 This allows for specifying a device by label or uuid, rather than by
704 name. This feature utilizes the same functionality as blkid/findfs.
705 This also enables label or uuid support for swapon.
707 config FEATURE_MOUNT_NFS
708 bool "Support mounting NFS file systems"
711 select FEATURE_HAVE_RPC
712 select FEATURE_SYSLOG
714 Enable mounting of NFS file systems.
716 config FEATURE_MOUNT_CIFS
717 bool "Support mounting CIFS/SMB file systems"
721 Enable support for samba mounts.
723 config FEATURE_MOUNT_FLAGS
725 bool "Support lots of -o flags in mount"
728 Without this, mount only supports ro/rw/remount. With this, it
729 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
730 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
731 private, unbindable, rshared, rslave, rprivate, and runbindable.
733 config FEATURE_MOUNT_FSTAB
735 bool "Support /etc/fstab and -a"
738 Support mount all and looking for files in /etc/fstab.
744 The pivot_root utility swaps the mount points for the root filesystem
745 with some other mounted filesystem. This allows you to do all sorts
746 of wild and crazy things with your Linux system and is far more
747 powerful than 'chroot'.
749 Note: This is for initrd in linux 2.4. Under initramfs (introduced
750 in linux 2.6) use switch_root instead.
756 The rdate utility allows you to synchronize the date and time of your
757 system clock with the date and time of a remote networked system using
758 the RFC868 protocol, which is built into the inetd daemon on most
765 Print the device node associated with the filesystem mounted at '/'.
771 This allows you to parse /proc/profile for basic profiling.
777 Enter a system sleep state until specified wakeup time.
783 The script makes typescript of terminal session.
789 This program replays a typescript, using timing information
796 The linux32 utility is used to create a 32bit environment for the
797 specified program (usually a shell). It only makes sense to have
798 this util on a system that supports both 64bit and 32bit userland
799 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
805 This option enables both the 'swapon' and the 'swapoff' utilities.
806 Once you have created some swap space using 'mkswap', you also need
807 to enable your swap space with the 'swapon' utility. The 'swapoff'
808 utility is used, typically at system shutdown, to disable any swap
809 space. If you are not using any swap space, you can leave this
812 config FEATURE_SWAPON_PRI
813 bool "Support priority option -p"
817 Enable support for setting swap device priority in swapon.
823 The switch_root utility is used from initramfs to select a new
824 root device. Under initramfs, you have to use this instead of
825 pivot_root. (Stop reading here if you don't care why.)
827 Booting with initramfs extracts a gzipped cpio archive into rootfs
828 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
829 or unmounted*, pivot_root will not work from initramfs. Instead,
830 switch_root deletes everything out of rootfs (including itself),
831 does a mount --move that overmounts rootfs with the new root, and
832 then execs the specified init program.
834 * Because the Linux kernel uses rootfs internally as the starting
835 and ending point for searching through the kernel's doubly linked
836 list of active mount points. That's why.
842 When you want to remove a mounted filesystem from its current mount
843 point, for example when you are shutting down the system, the
844 'umount' utility is the tool to use. If you enabled the 'mount'
845 utility, you almost certainly also want to enable 'umount'.
847 config FEATURE_UMOUNT_ALL
848 bool "Support option -a"
852 Support -a option to unmount all currently mounted filesystems.
854 comment "Common options for mount/umount"
855 depends on MOUNT || UMOUNT
857 config FEATURE_MOUNT_LOOP
858 bool "Support loopback mounts"
860 depends on MOUNT || UMOUNT
862 Enabling this feature allows automatic mounting of files (containing
863 filesystem images) via the linux kernel's loopback devices.
864 The mount command will detect you are trying to mount a file instead
865 of a block device, and transparently associate the file with a
866 loopback device. The umount command will also free that loopback
869 You can still use the 'losetup' utility (to manually associate files
870 with loop devices) if you need to do something advanced, such as
871 specify an offset or cryptographic options to the loopback device.
872 (If you don't want umount to free the loop device, use "umount -D".)
874 config FEATURE_MTAB_SUPPORT
875 bool "Support for the old /etc/mtab file"
877 depends on MOUNT || UMOUNT
878 select FEATURE_MOUNT_FAKE
880 Historically, Unix systems kept track of the currently mounted
881 partitions in the file "/etc/mtab". These days, the kernel exports
882 the list of currently mounted partitions in "/proc/mounts", rendering
883 the old mtab file obsolete. (In modern systems, /etc/mtab should be
884 a symlink to /proc/mounts.)
886 The only reason to have mount maintain an /etc/mtab file itself is if
887 your stripped-down embedded system does not have a /proc directory.
888 If you must use this, keep in mind it's inherently brittle (for
889 example a mount under chroot won't update it), can't handle modern
890 features like separate per-process filesystem namespaces, requires
891 that your /etc directory be writeable, tends to get easily confused
892 by --bind or --move mounts, won't update if you rename a directory
893 that contains a mount point, and so on. (In brief: avoid.)
895 About the only reason to use this is if you've removed /proc from