Section 4 of the manual describes special files (devices).
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- sppp
- point to point protocol network layer for synchronous lines
- st
- SCSI tape device
- stderr
- fd , stdin , stdout , stderr — file descriptor files
- stdin
- fd , stdin , stdout , stderr — file descriptor files
- stdout
- fd , stdin , stdout , stderr — file descriptor files
- ste
- Sundance Technologies ST201 Fast Ethernet device driver
- stf
- 6to4 tunnel interface
- stg
- driver for Future Domain based SCSI controllers
- stge
- Sundance/Tamarack TC9021 Gigabit Ethernet adapter driver
- superio
- Super I/O controller and bus driver
- sym
- NCR/Symbios/LSI Logic 53C8XX PCI SCSI host adapter driver
- synaptics
- touchpad input driver
- syncache
- syncache , syncookies — sysctl(8) MIBs for controlling TCP SYN caching
- syncer
- file system synchronizer kernel process
- syncookies
- syncache , syncookies — sysctl(8) MIBs for controlling TCP SYN caching
- syscons
- syscons , sc — the console driver
- sysmouse
- virtualized mouse driver
- tap
- tap , vmnet — Ethernet tunnel software network interface
- targ
- SCSI target emulator driver
- tcp
- Internet Transmission Control Protocol
- tdfx
- 3Dfx video driver
- tdfx
- Voodoo Graphics and VoodooII Memory Access GLIDE device driver
- tdfx_linux
- tdfx — Voodoo Graphics and VoodooII Memory Access GLIDE device driver
- terasic_mtl
- driver for the Terasic/Cambridge Multi-Touch LCD device
- termios
- general terminal line discipline
- textdump
- textdump kernel dumping facility
- ti
- Alteon Networks Tigon I and Tigon II Gigabit Ethernet driver
- timecounters
- kernel time counters subsystem
- tl
- Texas Instruments ThunderLAN Ethernet device driver
- tpm
- Trusted Platform Module
- trident
- Trident video driver
- trm
- Tekram TRM-S1040 ASIC based PCI SCSI host adapter driver
- trunk
- lagg — link aggregation and link failover interface
- tty
- controlling terminal
- tty
- general terminal interface
- ttyS
- serial terminal lines
- tty_ioctl
- ioctl_tty - ioctls for terminals and serial lines
- tun
- tunnel software network interface
- twa
- 3ware 9000/9500/9550/9650 series SATA RAID controllers driver
- twconfig
- Tripwire configuration file reference
- twe
- 3ware 5000/6000/7000/8000 series PATA/SATA RAID adapter driver
- twpolicy
- Tripwire policy file reference
- tws
- 3ware 9750 SATA+SAS 6Gb/s RAID controller card driver
- tx
- SMC 83c17x Fast Ethernet device driver
- txp
- 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface
- u3g
- USB support for 3G datacards
- u3gstub
- u3g — USB support for 3G datacards
- uark
- Arkmicro Technologies ARK3116 based USB serial adapter
- uart
- driver for Universal Asynchronous Receiver/Transmitter (UART) devices
- uath
- Atheros USB IEEE 802.11a/b/g wireless network device
- ubsa
- USB support for Belkin serial adapters
- ubsec
- Broadcom and BlueSteel uBsec 5x0x crypto accelerator
- ubser
- USB support for BWCT console serial adapters
- ubtbcmfw
- Firmware driver for Broadcom BCM2033 chip based Bluetooth USB devices
- uchcom
- WinChipHead CH341/CH340 serial adapter driver
- ucom
- USB tty support
- ucycom
- device driver for Cypress CY7C63743 and CY7C64013 USB to RS232 bridges
- udav
- Davicom DM9601 USB Ethernet driver
- udbp
- USB Double Bulk Pipe driver
- udl
- DisplayLink DL-120 / DL-160 USB display devices
- udp
- Internet User Datagram Protocol
- udplite
- Lightweight User Datagram Protocol
- uep
- eGalax touchscreen driver
- ufm
- USB driver for Cypress Semiconductor FM Radio
- ufoma
- USB mobile phone support
- uftdi
- USB support for serial adapters based on the FTDI family of USB serial adapter chips
- ugen
- USB generic device support
- ugold
- TEMPer gold HID thermometer
- uhci
- UHCI USB Host Controller driver
- uhid
- USB generic HID support
- uhso
- support for several HSxPA devices from Option N.V
- uipaq
- USB support for iPAQ units
- ukbd
- USB keyboard driver
- uled
- USB LED driver
- ulpt
- USB printer support
- umass
- USB Mass Storage Devices driver
- umcs
- USB support for serial adapters based on the MCS7820 and MCS7840 chips
- umct
- Magic Control Technology USB-RS232 converter driver
- umodem
- USB Communication Device Class serial (CDC ACM) driver
- umoscom
- USB support for serial adapters based on chips made by MOSCHIP
- ums
- USB mouse driver
- unix
- UNIX-domain protocol family
- upgt
- Conexant/Intersil PrismGT SoftMAC USB IEEE 802.11b/g wireless network device
- uplcom
- USB support for Prolific PL-2303/2303X/2303HX serial adapters driver
- ural
- Ralink Technology RT2500USB IEEE 802.11 driver
- urandom
- random, urandom - kernel random number source devices
- ure
- RealTek RTL8152/RTL8153 USB to Ethernet controller driver
- urio
- USB driver for the Rio MP3 players
- urndis
- USB Remote NDIS Ethernet device
- urtw
- Realtek RTL8187B/L USB IEEE 802.11b/g wireless network device
- usb
- Universal Serial Bus
- usb_quirk
- USB quirks module
- usb_template
- USB device side templates
- usfs
- USB device side support for bulk only transport mass storage
- uslcom
- Silicon Laboratories CP2101/CP2102/CP2103/CP2104/CP2105 based USB serial adapter
- uvisor
- USB support for the PalmOS based PDAs
- uvscom
- USB support for SUNTAC Slipper U VS-10U serial adapters driver
- vale
- a very fast Virtual Local Ethernet using the netmap API
- vcc
- cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver
- vcs
- vcs, vcsa - virtual console memory