ttyS(4)

📦
version 6.20 · 13 versions
, in arch rolling, nixpkgs unstable

✨ NAME ✨

ttyS — serial terminal lines. Okay bestie, this is the ttyS(4) page from the Kernel Interfaces Manual, and it's lowkey iconic for anyone who's ever needed a serial terminal line. 👑

🎀 DESCRIPTION 🎀

ttyS[0-3] are character devices for the serial terminal lines. That's the whole vibe: character devices, zero drama, fr fr. 🦋

They are typically created by:

mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x3f8
mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x2f8
mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x3e8
mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x2e8
chown root:tty /dev/ttyS[0-3]

Look at that little lineup — ttyS0 at base address 0x3f8, ttyS1 at 0x2f8, ttyS2 at 0x3e8, and ttyS3 at 0x2e8. The mknod commands use mode 660, and then chown root:tty /dev/ttyS[0-3] comes through to complete the set. Main character behavior, no cap. 💅

📁 FILES 📁

  • /dev/ttyS[0-3]

👀 SEE ALSO 👀

Linux man-pages 6.20 · 2025-05-17 — that's the source/version and date, bestie. Go forth and slay with your serial terminal lines. 💖✨

📦 where this page comes from
  • arch rolling: man-pages 6.20-1 · BSD-2-Clause AND BSD-3-Clause AND BSD-4.3TAHOE AND BSD-4-Clause-UC AND GPL-1.0-or-later AND GPL-2.0-only AND GPL-2.0-or-later AND GPL-3.0-or-later AND LGPL-3.0-linking-exception AND LGPL-3.0-or-later AND LicenseRef-Public-Domain AND LicenseRef-UltraPermissive AND Linux-man-pages-1-para AND Linux-man-pages-copyleft AND Linux-man-pages-copyleft-2-para AND Linux-man-pages-copyleft-var AND MIT AND Spencer-94
  • nixpkgs unstable: man-pages 6.20
  • 📜 the page's license: GPL-2.0-or-later
  • 💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash on : a language model's rewrite of the original, under its terms