# phpman > man > ttys(4)

[TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)                               Linux Programmer's Manual                              [TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)



## 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 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]

## FILES
       _/dev/ttyS[0-3]_

## SEE ALSO
       [**chown**(1)](https://www.chedong.com/phpMan.php/man/chown/1/markdown), [**mknod**(1)](https://www.chedong.com/phpMan.php/man/mknod/1/markdown), [**tty**(4)](https://www.chedong.com/phpMan.php/man/tty/4/markdown), [**agetty**(8)](https://www.chedong.com/phpMan.php/man/agetty/8/markdown), [**mingetty**(8)](https://www.chedong.com/phpMan.php/man/mingetty/8/markdown), [**setserial**(8)](https://www.chedong.com/phpMan.php/man/setserial/8/markdown)

## COLOPHON
       This  page  is  part  of  release  5.10 of the Linux _man-pages_ project.  A description of the
       project, information about reporting bugs, and the latest version of this page, can be  found
       at <https://www.kernel.org/doc/man-pages/>.



Linux                                        1992-12-19                                      [TTYS(4)](https://www.chedong.com/phpMan.php/man/TTYS/4/markdown)