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.
253 config FEATURE_GETOPT_LONG
254 bool "Support option -l"
255 default y if LONG_OPTS
257 Enable support for recognising long options using the -l option to
264 The hexdump utility is used to display binary data in a readable
265 way that is comparable to the output from most hex editors.
267 config FEATURE_HEXDUMP_REVERSE
268 bool "Support -R, reverse of 'hexdump -Cv'"
272 The hexdump utility is used to display binary data in an ascii
273 readable way. This option creates binary data from an ascii input.
274 NB: this option is non-standard. It's unwise to use it in scripts
275 aimed to be portable.
282 hd is an alias to hexdump -C.
288 The hwclock utility is used to read and set the hardware clock
289 on a system. This is primarily used to set the current time on
290 shutdown in the hardware clock, so the hardware will keep the
291 correct time when Linux is _not_ running.
293 config FEATURE_HWCLOCK_LONG_OPTIONS
294 bool "Support long options (--hctosys,...)"
296 depends on HWCLOCK && LONG_OPTS
298 By default, the hwclock utility only uses short options. If you
299 are overly fond of its long options, such as --hctosys, --utc, etc)
300 then enable this option.
302 config FEATURE_HWCLOCK_ADJTIME_FHS
303 bool "Use FHS /var/lib/hwclock/adjtime"
307 Starting with FHS 2.3, the adjtime state file is supposed to exist
308 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
309 to use the FHS behavior, answer Y here, otherwise answer N for the
310 classic /etc/adjtime path.
312 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
319 The ipcrm utility allows the removal of System V interprocess
320 communication (IPC) objects and the associated data structures
328 The ipcs utility is used to provide information on the currently
329 allocated System V interprocess (IPC) objects in the system.
335 losetup is used to associate or detach a loop device with a regular
336 file or block device, and to query the status of a loop device. This
337 version does not currently support enabling data encryption.
343 mdev is a mini-udev implementation for dynamically creating device
344 nodes in the /dev directory.
346 For more information, please see docs/mdev.txt
348 config FEATURE_MDEV_CONF
349 bool "Support /etc/mdev.conf"
353 Add support for the mdev config file to control ownership and
354 permissions of the device nodes.
356 For more information, please see docs/mdev.txt
358 config FEATURE_MDEV_RENAME
359 bool "Support subdirs/symlinks"
361 depends on FEATURE_MDEV_CONF
363 Add support for renaming devices and creating symlinks.
365 For more information, please see docs/mdev.txt
367 config FEATURE_MDEV_RENAME_REGEXP
368 bool "Support regular expressions substitutions when renaming device"
370 depends on FEATURE_MDEV_RENAME
372 Add support for regular expressions substitutions when renaming
375 config FEATURE_MDEV_EXEC
376 bool "Support command execution at device addition/removal"
378 depends on FEATURE_MDEV_CONF
380 This adds support for an optional field to /etc/mdev.conf for
381 executing commands when devices are created/removed.
383 For more information, please see docs/mdev.txt
385 config FEATURE_MDEV_LOAD_FIRMWARE
386 bool "Support loading of firmwares"
390 Some devices need to load firmware before they can be usable.
392 These devices will request userspace look up the files in
393 /lib/firmware/ and if it exists, send it to the kernel for
394 loading into the hardware.
400 The mkswap utility is used to configure a file or disk partition as
401 Linux swap space. This allows Linux to use the entire file or
402 partition as if it were additional RAM, which can greatly increase
403 the capability of low-memory machines. This additional memory is
404 much slower than real RAM, but can be very helpful at preventing your
405 applications being killed by the Linux out of memory (OOM) killer.
406 Once you have created swap space using 'mkswap' you need to enable
407 the swap space using the 'swapon' utility.
409 config FEATURE_MKSWAP_V0
410 bool "Version 0 support"
413 # depends on MKSWAP && DEPRECATED
415 Enable support for the old v0 style.
416 If your kernel is older than 2.1.117, then v0 support is the
423 more is a simple utility which allows you to read text one screen
424 sized page at a time. If you want to read text that is larger than
425 the screen, and you are using anything faster than a 300 baud modem,
426 you will probably find this utility very helpful. If you don't have
427 any need to reading text files, you can leave this disabled.
429 config FEATURE_USE_TERMIOS
430 bool "Use termios to manipulate the screen"
432 depends on MORE || TOP
434 This option allows utilities such as 'more' and 'top' to determine
435 the size of the screen. If you leave this disabled, your utilities
436 that display things on the screen will be especially primitive and
437 will be unable to determine the current screen size, and will be
438 unable to move the cursor.
441 bool #No description makes it a hidden option
444 config FEATURE_VOLUMEID_EXT
445 bool "Ext filesystem"
451 config FEATURE_VOLUMEID_REISERFS
452 bool "Reiser filesystem"
458 config FEATURE_VOLUMEID_FAT
459 bool "fat filesystem"
465 config FEATURE_VOLUMEID_HFS
466 bool "hfs filesystem"
472 config FEATURE_VOLUMEID_JFS
473 bool "jfs filesystem"
479 ### config FEATURE_VOLUMEID_UFS
480 ### bool "ufs filesystem"
482 ### depends on VOLUMEID
486 config FEATURE_VOLUMEID_XFS
487 bool "xfs filesystem"
493 config FEATURE_VOLUMEID_NTFS
494 bool "ntfs filesystem"
500 config FEATURE_VOLUMEID_ISO9660
501 bool "iso9660 filesystem"
507 config FEATURE_VOLUMEID_UDF
508 bool "udf filesystem"
514 config FEATURE_VOLUMEID_LUKS
515 bool "luks filesystem"
521 config FEATURE_VOLUMEID_LINUXSWAP
522 bool "linux swap filesystem"
528 ### config FEATURE_VOLUMEID_LVM
531 ### depends on VOLUMEID
535 config FEATURE_VOLUMEID_CRAMFS
536 bool "cramfs filesystem"
542 ### config FEATURE_VOLUMEID_HPFS
543 ### bool "hpfs filesystem"
545 ### depends on VOLUMEID
549 config FEATURE_VOLUMEID_ROMFS
550 bool "romfs filesystem"
556 config FEATURE_VOLUMEID_SYSV
557 bool "sysv filesystem"
563 ### config FEATURE_VOLUMEID_MINIX
564 ### bool "minix filesystem"
566 ### depends on VOLUMEID
570 ### These only detect partition tables - not used (yet?)
571 ### config FEATURE_VOLUMEID_MAC
572 ### bool "mac filesystem"
574 ### depends on VOLUMEID
578 ### config FEATURE_VOLUMEID_MSDOS
579 ### bool "msdos filesystem"
581 ### depends on VOLUMEID
585 config FEATURE_VOLUMEID_OCFS2
586 bool "ocfs2 filesystem"
592 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
593 ### bool "highpoint raid"
595 ### depends on VOLUMEID
599 ### config FEATURE_VOLUMEID_ISWRAID
600 ### bool "intel raid"
602 ### depends on VOLUMEID
606 ### config FEATURE_VOLUMEID_LSIRAID
609 ### depends on VOLUMEID
613 ### config FEATURE_VOLUMEID_VIARAID
616 ### depends on VOLUMEID
620 ### config FEATURE_VOLUMEID_SILICONRAID
621 ### bool "silicon raid"
623 ### depends on VOLUMEID
627 ### config FEATURE_VOLUMEID_NVIDIARAID
628 ### bool "nvidia raid"
630 ### depends on VOLUMEID
634 ### config FEATURE_VOLUMEID_PROMISERAID
635 ### bool "promise raid"
637 ### depends on VOLUMEID
641 config FEATURE_VOLUMEID_LINUXRAID
652 All files and filesystems in Unix are arranged into one big directory
653 tree. The 'mount' utility is used to graft a filesystem onto a
654 particular part of the tree. A filesystem can either live on a block
655 device, or it can be accessible over the network, as is the case with
656 NFS filesystems. Most people using BusyBox will also want to enable
659 config FEATURE_MOUNT_FAKE
660 bool "Support option -f"
664 Enable support for faking a file system mount.
666 config FEATURE_MOUNT_VERBOSE
667 bool "Support option -v"
671 Enable multi-level -v[vv...] verbose messages. Useful if you
672 debug mount problems and want to see what is exactly passed
675 config FEATURE_MOUNT_HELPERS
676 bool "Support mount helpers"
680 Enable mounting of virtual file systems via external helpers.
681 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
682 "obexfs -b00.11.22.33.44.55 /mnt"
683 Also "mount -t sometype [-o opts] fs /mnt" will try
684 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
685 The idea is to use such virtual filesystems in /etc/fstab.
687 config FEATURE_MOUNT_LABEL
688 bool "Support specifiying devices by label or UUID"
693 This allows for specifying a device by label or uuid, rather than by
694 name. This feature utilizes the same functionality as blkid/findfs.
696 config FEATURE_MOUNT_NFS
697 bool "Support mounting NFS file systems"
700 select FEATURE_HAVE_RPC
701 select FEATURE_SYSLOG
703 Enable mounting of NFS file systems.
705 config FEATURE_MOUNT_CIFS
706 bool "Support mounting CIFS/SMB file systems"
710 Enable support for samba mounts.
712 config FEATURE_MOUNT_FLAGS
714 bool "Support lots of -o flags in mount"
717 Without this, mount only supports ro/rw/remount. With this, it
718 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
719 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
720 private, unbindable, rshared, rslave, rprivate, and runbindable.
722 config FEATURE_MOUNT_FSTAB
724 bool "Support /etc/fstab and -a"
727 Support mount all and looking for files in /etc/fstab.
733 The pivot_root utility swaps the mount points for the root filesystem
734 with some other mounted filesystem. This allows you to do all sorts
735 of wild and crazy things with your Linux system and is far more
736 powerful than 'chroot'.
738 Note: This is for initrd in linux 2.4. Under initramfs (introduced
739 in linux 2.6) use switch_root instead.
745 The rdate utility allows you to synchronize the date and time of your
746 system clock with the date and time of a remote networked system using
747 the RFC868 protocol, which is built into the inetd daemon on most
754 Print the device node associated with the filesystem mounted at '/'.
760 This allows you to parse /proc/profile for basic profiling.
766 Enter a system sleep state until specified wakeup time.
772 The script makes typescript of terminal session.
778 This program replays a typescript, using timing information
785 The linux32 utility is used to create a 32bit environment for the
786 specified program (usually a shell). It only makes sense to have
787 this util on a system that supports both 64bit and 32bit userland
788 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
794 This option enables both the 'swapon' and the 'swapoff' utilities.
795 Once you have created some swap space using 'mkswap', you also need
796 to enable your swap space with the 'swapon' utility. The 'swapoff'
797 utility is used, typically at system shutdown, to disable any swap
798 space. If you are not using any swap space, you can leave this
801 config FEATURE_SWAPON_PRI
802 bool "Support priority option -p"
806 Enable support for setting swap device priority in swapon.
812 The switch_root utility is used from initramfs to select a new
813 root device. Under initramfs, you have to use this instead of
814 pivot_root. (Stop reading here if you don't care why.)
816 Booting with initramfs extracts a gzipped cpio archive into rootfs
817 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
818 or unmounted*, pivot_root will not work from initramfs. Instead,
819 switch_root deletes everything out of rootfs (including itself),
820 does a mount --move that overmounts rootfs with the new root, and
821 then execs the specified init program.
823 * Because the Linux kernel uses rootfs internally as the starting
824 and ending point for searching through the kernel's doubly linked
825 list of active mount points. That's why.
831 When you want to remove a mounted filesystem from its current mount
832 point, for example when you are shutting down the system, the
833 'umount' utility is the tool to use. If you enabled the 'mount'
834 utility, you almost certainly also want to enable 'umount'.
836 config FEATURE_UMOUNT_ALL
837 bool "Support option -a"
841 Support -a option to unmount all currently mounted filesystems.
843 comment "Common options for mount/umount"
844 depends on MOUNT || UMOUNT
846 config FEATURE_MOUNT_LOOP
847 bool "Support loopback mounts"
849 depends on MOUNT || UMOUNT
851 Enabling this feature allows automatic mounting of files (containing
852 filesystem images) via the linux kernel's loopback devices.
853 The mount command will detect you are trying to mount a file instead
854 of a block device, and transparently associate the file with a
855 loopback device. The umount command will also free that loopback
858 You can still use the 'losetup' utility (to manually associate files
859 with loop devices) if you need to do something advanced, such as
860 specify an offset or cryptographic options to the loopback device.
861 (If you don't want umount to free the loop device, use "umount -D".)
863 config FEATURE_MTAB_SUPPORT
864 bool "Support for the old /etc/mtab file"
866 depends on MOUNT || UMOUNT
867 select FEATURE_MOUNT_FAKE
869 Historically, Unix systems kept track of the currently mounted
870 partitions in the file "/etc/mtab". These days, the kernel exports
871 the list of currently mounted partitions in "/proc/mounts", rendering
872 the old mtab file obsolete. (In modern systems, /etc/mtab should be
873 a symlink to /proc/mounts.)
875 The only reason to have mount maintain an /etc/mtab file itself is if
876 your stripped-down embedded system does not have a /proc directory.
877 If you must use this, keep in mind it's inherently brittle (for
878 example a mount under chroot won't update it), can't handle modern
879 features like separate per-process filesystem namespaces, requires
880 that your /etc directory be writeable, tends to get easily confused
881 by --bind or --move mounts, won't update if you rename a directory
882 that contains a mount point, and so on. (In brief: avoid.)
884 About the only reason to use this is if you've removed /proc from