---
name: "ttys"
section: "4"
platform: "linux"
package: "manpages"
version: "3.27-1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/ttys/4"
---

# ttys(4)

serial terminal lines

## NAME

ttys - serial terminal lines

## DESCRIPTION

**ttyS\[0-3\]** are character devices for the serial terminal lines.

They are typically created by:

mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x03f8\
 mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x02f8\
 mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x03e8\
 mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x02e8\
 chown root:tty /dev/ttyS\[0-3\]

## FILES

/dev/ttyS\[0-3\]

## SEE ALSO

[**mknod**(1)](/mknod/1.md), [**chown**(1)](/chown/1.md), **getty**(1), [**tty**(4)](/tty/4.md)