2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Linux System Utilities"
15 acpid listens to ACPI events coming either in textual form from
16 /proc/acpi/event (though it is marked deprecated it is still widely
17 used and _is_ a standard) or in binary form from specified evdevs
18 (just use /dev/input/event*).
20 It parses the event to retrieve ACTION and a possible PARAMETER.
21 It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
22 (if the resulting path is a directory) or directly as an executable.
24 N.B. acpid relies on run-parts so have the latter installed.
26 config FEATURE_ACPID_COMPAT
27 bool "Accept and ignore redundant options"
31 Accept and ignore compatibility options -g -m -s -S -v.
39 Lists labels and UUIDs of all filesystems.
41 With all submodules selected, it will add ~8k to busybox.
43 config FEATURE_BLKID_TYPE
44 bool "Print filesystem type"
48 Show TYPE="filesystem type"
55 dmesg is used to examine or control the kernel ring buffer. When the
56 Linux kernel prints messages to the system log, they are stored in
57 the kernel ring buffer. You can use dmesg to print the kernel's ring
58 buffer, clear the kernel ring buffer, change the size of the kernel
59 ring buffer, and change the priority level at which kernel messages
60 are also logged to the system console. Enable this option if you
61 wish to enable the 'dmesg' utility.
63 config FEATURE_DMESG_PRETTY
64 bool "Pretty dmesg output"
68 If you wish to scrub the syslog level from the output, say 'Y' here.
69 The syslog level is a string prefixed to every line with the form
72 With this option you will see:
74 Linux version 2.6.17.4 .....
75 BIOS-provided physical RAM map:
76 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
78 Without this option you will see:
80 <5>Linux version 2.6.17.4 .....
81 <6>BIOS-provided physical RAM map:
82 <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
89 fbset is used to show or change the settings of a Linux frame buffer
90 device. The frame buffer device provides a simple and unique
91 interface to access a graphics display. Enable this option
92 if you wish to enable the 'fbset' utility.
94 config FEATURE_FBSET_FANCY
95 bool "Turn on extra fbset options"
99 This option enables extended fbset options, allowing one to set the
100 framebuffer size, color depth, etc. interface to access a graphics
101 display. Enable this option if you wish to enable extended fbset
104 config FEATURE_FBSET_READMODE
105 bool "Turn on fbset readmode support"
109 This option allows fbset to read the video mode database stored by
110 default as /etc/fb.modes, which can be used to set frame buffer
111 device to pre-defined video modes.
116 select PLATFORM_LINUX
118 fdflush is only needed when changing media on slightly-broken
119 removable media drives. It is used to make Linux believe that a
120 hardware disk-change switch has been actuated, which causes Linux to
121 forget anything it has cached from the previous media. If you have
122 such a slightly-broken drive, you will need to run fdflush every time
123 you change a disk. Most people have working hardware and can safely
129 select PLATFORM_LINUX
131 fdformat is used to low-level format a floppy disk.
136 select PLATFORM_LINUX
138 The fdisk utility is used to divide hard disks into one or more
139 logical disks, which are generally called partitions. This utility
140 can be used to list and edit the set of partitions or BSD style
141 'disk slices' that are defined on a hard drive.
143 config FDISK_SUPPORT_LARGE_DISKS
144 bool "Support over 4GB disks"
147 depends on !LFS # with LFS no special code is needed
149 Enable this option to support large disks > 4GB.
151 config FEATURE_FDISK_WRITABLE
156 Enabling this option allows you to create or change a partition table
157 and write those changes out to disk. If you leave this option
158 disabled, you will only be able to view the partition table.
160 config FEATURE_AIX_LABEL
161 bool "Support AIX disklabels"
163 depends on FDISK && FEATURE_FDISK_WRITABLE
165 Enabling this option allows you to create or change AIX disklabels.
166 Most people can safely leave this option disabled.
168 config FEATURE_SGI_LABEL
169 bool "Support SGI disklabels"
171 depends on FDISK && FEATURE_FDISK_WRITABLE
173 Enabling this option allows you to create or change SGI disklabels.
174 Most people can safely leave this option disabled.
176 config FEATURE_SUN_LABEL
177 bool "Support SUN disklabels"
179 depends on FDISK && FEATURE_FDISK_WRITABLE
181 Enabling this option allows you to create or change SUN disklabels.
182 Most people can safely leave this option disabled.
184 config FEATURE_OSF_LABEL
185 bool "Support BSD disklabels"
187 depends on FDISK && FEATURE_FDISK_WRITABLE
189 Enabling this option allows you to create or change BSD disklabels
190 and define and edit BSD disk slices.
192 config FEATURE_GPT_LABEL
193 bool "Support GPT disklabels"
195 depends on FDISK && FEATURE_FDISK_WRITABLE
197 Enabling this option allows you to view GUID Partition Table
200 config FEATURE_FDISK_ADVANCED
201 bool "Support expert mode"
203 depends on FDISK && FEATURE_FDISK_WRITABLE
205 Enabling this option allows you to do terribly unsafe things like
206 define arbitrary drive geometry, move the beginning of data in a
207 partition, and similarly evil things. Unless you have a very good
208 reason you would be wise to leave this disabled.
213 select PLATFORM_LINUX
216 Prints the name of a filesystem with given label or UUID.
218 With all submodules selected, it will add ~8k to busybox.
224 Manage locks from shell scripts
229 select PLATFORM_LINUX
231 Linux allows you to create ramdisks. This utility allows you to
232 delete them and completely free all memory that was used for the
233 ramdisk. For example, if you boot Linux into a ramdisk and later
234 pivot_root, you may want to free the memory that is allocated to the
235 ramdisk. If you have no use for freeing memory from a ramdisk, leave
242 The minix filesystem is a nice, small, compact, read-write filesystem
243 with little overhead. It is not a journaling filesystem however and
244 can experience corruption if it is not properly unmounted or if the
245 power goes off in the middle of a write. This utility allows you to
246 check for and attempt to repair any corruption that occurs to a minix
252 select PLATFORM_LINUX
254 Discard unused blocks on a mounted filesystem.
259 select PLATFORM_LINUX
261 Utility to create EXT2 filesystems.
266 select PLATFORM_LINUX
268 The minix filesystem is a nice, small, compact, read-write filesystem
269 with little overhead. If you wish to be able to create minix
270 filesystems this utility will do the job for you.
272 config FEATURE_MINIX2
273 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
275 depends on FSCK_MINIX || MKFS_MINIX
277 If you wish to be able to create version 2 minix filesystems, enable
278 this. If you enabled 'mkfs_minix' then you almost certainly want to
279 be using the version 2 filesystem support.
284 select PLATFORM_LINUX
286 Utility to create ReiserFS filesystems.
287 Note: this applet needs a lot of testing and polishing.
292 select PLATFORM_LINUX
294 Utility to create FAT32 filesystems.
300 The getopt utility is used to break up (parse) options in command
301 lines to make it easy to write complex shell scripts that also check
302 for legal (and illegal) options. If you want to write horribly
303 complex shell scripts, or use some horribly complex shell script
304 written by others, this utility may be for you. Most people will
305 wisely leave this disabled.
307 config FEATURE_GETOPT_LONG
308 bool "Support option -l"
309 default y if LONG_OPTS
312 Enable support for long options (option -l).
318 The hexdump utility is used to display binary data in a readable
319 way that is comparable to the output from most hex editors.
321 config FEATURE_HEXDUMP_REVERSE
322 bool "Support -R, reverse of 'hexdump -Cv'"
326 The hexdump utility is used to display binary data in an ascii
327 readable way. This option creates binary data from an ascii input.
328 NB: this option is non-standard. It's unwise to use it in scripts
329 aimed to be portable.
336 hd is an alias to hexdump -C.
341 select PLATFORM_LINUX
343 The hwclock utility is used to read and set the hardware clock
344 on a system. This is primarily used to set the current time on
345 shutdown in the hardware clock, so the hardware will keep the
346 correct time when Linux is _not_ running.
348 config FEATURE_HWCLOCK_LONG_OPTIONS
349 bool "Support long options (--hctosys,...)"
351 depends on HWCLOCK && LONG_OPTS
353 By default, the hwclock utility only uses short options. If you
354 are overly fond of its long options, such as --hctosys, --utc, etc)
355 then enable this option.
357 config FEATURE_HWCLOCK_ADJTIME_FHS
358 bool "Use FHS /var/lib/hwclock/adjtime"
359 default n # util-linux-ng in Fedora 13 still uses /etc/adjtime
362 Starting with FHS 2.3, the adjtime state file is supposed to exist
363 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
364 to use the FHS behavior, answer Y here, otherwise answer N for the
365 classic /etc/adjtime path.
367 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
373 The ipcrm utility allows the removal of System V interprocess
374 communication (IPC) objects and the associated data structures
380 select PLATFORM_LINUX
382 The ipcs utility is used to provide information on the currently
383 allocated System V interprocess (IPC) objects in the system.
388 select PLATFORM_LINUX
390 losetup is used to associate or detach a loop device with a regular
391 file or block device, and to query the status of a loop device. This
392 version does not currently support enabling data encryption.
397 #select PLATFORM_LINUX
399 lspci is a utility for displaying information about PCI buses in the
400 system and devices connected to them.
402 This version uses sysfs (/sys/bus/pci/devices) only.
407 #select PLATFORM_LINUX
409 lsusb is a utility for displaying information about USB buses in the
410 system and devices connected to them.
412 This version uses sysfs (/sys/bus/usb/devices) only.
418 The mkswap utility is used to configure a file or disk partition as
419 Linux swap space. This allows Linux to use the entire file or
420 partition as if it were additional RAM, which can greatly increase
421 the capability of low-memory machines. This additional memory is
422 much slower than real RAM, but can be very helpful at preventing your
423 applications being killed by the Linux out of memory (OOM) killer.
424 Once you have created swap space using 'mkswap' you need to enable
425 the swap space using the 'swapon' utility.
427 config FEATURE_MKSWAP_UUID
432 Generate swap spaces with universally unique identifiers.
438 more is a simple utility which allows you to read text one screen
439 sized page at a time. If you want to read text that is larger than
440 the screen, and you are using anything faster than a 300 baud modem,
441 you will probably find this utility very helpful. If you don't have
442 any need to reading text files, you can leave this disabled.
447 select PLATFORM_LINUX
449 All files and filesystems in Unix are arranged into one big directory
450 tree. The 'mount' utility is used to graft a filesystem onto a
451 particular part of the tree. A filesystem can either live on a block
452 device, or it can be accessible over the network, as is the case with
453 NFS filesystems. Most people using BusyBox will also want to enable
456 config FEATURE_MOUNT_FAKE
457 bool "Support option -f"
461 Enable support for faking a file system mount.
463 config FEATURE_MOUNT_VERBOSE
464 bool "Support option -v"
468 Enable multi-level -v[vv...] verbose messages. Useful if you
469 debug mount problems and want to see what is exactly passed
472 config FEATURE_MOUNT_HELPERS
473 bool "Support mount helpers"
477 Enable mounting of virtual file systems via external helpers.
478 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
479 "obexfs -b00.11.22.33.44.55 /mnt"
480 Also "mount -t sometype [-o opts] fs /mnt" will try
481 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
482 The idea is to use such virtual filesystems in /etc/fstab.
484 config FEATURE_MOUNT_LABEL
485 bool "Support specifying devices by label or UUID"
490 This allows for specifying a device by label or uuid, rather than by
491 name. This feature utilizes the same functionality as blkid/findfs.
492 This also enables label or uuid support for swapon.
494 config FEATURE_MOUNT_NFS
495 bool "Support mounting NFS file systems on Linux < 2.6.23"
498 select FEATURE_HAVE_RPC
499 select FEATURE_SYSLOG
501 Enable mounting of NFS file systems on Linux kernels prior
502 to version 2.6.23. Note that in this case mounting of NFS
503 over IPv6 will not be possible.
505 Note that this option links in RPC support from libc,
506 which is rather large (~10 kbytes on uclibc).
508 config FEATURE_MOUNT_CIFS
509 bool "Support mounting CIFS/SMB file systems"
513 Enable support for samba mounts.
515 config FEATURE_MOUNT_FLAGS
517 bool "Support lots of -o flags in mount"
520 Without this, mount only supports ro/rw/remount. With this, it
521 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
522 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
523 private, unbindable, rshared, rslave, rprivate, and runbindable.
525 config FEATURE_MOUNT_FSTAB
527 bool "Support /etc/fstab and -a"
530 Support mount all and looking for files in /etc/fstab.
535 select PLATFORM_LINUX
537 The pivot_root utility swaps the mount points for the root filesystem
538 with some other mounted filesystem. This allows you to do all sorts
539 of wild and crazy things with your Linux system and is far more
540 powerful than 'chroot'.
542 Note: This is for initrd in linux 2.4. Under initramfs (introduced
543 in linux 2.6) use switch_root instead.
549 The rdate utility allows you to synchronize the date and time of your
550 system clock with the date and time of a remote networked system using
551 the RFC868 protocol, which is built into the inetd daemon on most
558 Print the device node associated with the filesystem mounted at '/'.
563 #select PLATFORM_LINUX
565 This allows you to parse /proc/profile for basic profiling.
570 select PLATFORM_LINUX
572 Enter a system sleep state until specified wakeup time.
578 The script makes typescript of terminal session.
584 This program replays a typescript, using timing information
590 select PLATFORM_LINUX
592 The linux32 utility is used to create a 32bit environment for the
593 specified program (usually a shell). It only makes sense to have
594 this util on a system that supports both 64bit and 32bit userland
595 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
600 select PLATFORM_LINUX
602 This option enables both the 'swapon' and the 'swapoff' utilities.
603 Once you have created some swap space using 'mkswap', you also need
604 to enable your swap space with the 'swapon' utility. The 'swapoff'
605 utility is used, typically at system shutdown, to disable any swap
606 space. If you are not using any swap space, you can leave this
609 config FEATURE_SWAPON_PRI
610 bool "Support priority option -p"
614 Enable support for setting swap device priority in swapon.
619 select PLATFORM_LINUX
621 The switch_root utility is used from initramfs to select a new
622 root device. Under initramfs, you have to use this instead of
623 pivot_root. (Stop reading here if you don't care why.)
625 Booting with initramfs extracts a gzipped cpio archive into rootfs
626 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
627 or unmounted*, pivot_root will not work from initramfs. Instead,
628 switch_root deletes everything out of rootfs (including itself),
629 does a mount --move that overmounts rootfs with the new root, and
630 then execs the specified init program.
632 * Because the Linux kernel uses rootfs internally as the starting
633 and ending point for searching through the kernel's doubly linked
634 list of active mount points. That's why.
639 select PLATFORM_LINUX
641 When you want to remove a mounted filesystem from its current mount
642 point, for example when you are shutting down the system, the
643 'umount' utility is the tool to use. If you enabled the 'mount'
644 utility, you almost certainly also want to enable 'umount'.
646 config FEATURE_UMOUNT_ALL
647 bool "Support option -a"
651 Support -a option to unmount all currently mounted filesystems.
653 comment "Common options for mount/umount"
654 depends on MOUNT || UMOUNT
656 config FEATURE_MOUNT_LOOP
657 bool "Support loopback mounts"
659 depends on MOUNT || UMOUNT
661 Enabling this feature allows automatic mounting of files (containing
662 filesystem images) via the linux kernel's loopback devices.
663 The mount command will detect you are trying to mount a file instead
664 of a block device, and transparently associate the file with a
665 loopback device. The umount command will also free that loopback
668 You can still use the 'losetup' utility (to manually associate files
669 with loop devices) if you need to do something advanced, such as
670 specify an offset or cryptographic options to the loopback device.
671 (If you don't want umount to free the loop device, use "umount -D".)
673 config FEATURE_MOUNT_LOOP_CREATE
674 bool "Create new loopback devices if needed"
676 depends on FEATURE_MOUNT_LOOP
678 Linux kernels >= 2.6.24 support unlimited loopback devices. They are
679 allocated for use when trying to use a loop device. The loop device
682 This feature lets mount to try to create next /dev/loopN device
683 if it does not find a free one.
685 config FEATURE_MTAB_SUPPORT
686 bool "Support for the old /etc/mtab file"
688 depends on MOUNT || UMOUNT
689 select FEATURE_MOUNT_FAKE
691 Historically, Unix systems kept track of the currently mounted
692 partitions in the file "/etc/mtab". These days, the kernel exports
693 the list of currently mounted partitions in "/proc/mounts", rendering
694 the old mtab file obsolete. (In modern systems, /etc/mtab should be
695 a symlink to /proc/mounts.)
697 The only reason to have mount maintain an /etc/mtab file itself is if
698 your stripped-down embedded system does not have a /proc directory.
699 If you must use this, keep in mind it's inherently brittle (for
700 example a mount under chroot won't update it), can't handle modern
701 features like separate per-process filesystem namespaces, requires
702 that your /etc directory be writable, tends to get easily confused
703 by --bind or --move mounts, won't update if you rename a directory
704 that contains a mount point, and so on. (In brief: avoid.)
706 About the only reason to use this is if you've removed /proc from
709 source util-linux/volume_id/Config.in