What is /dev/pts and why do we need it in Linux?

A quick check in /dev/pts shows a lot of entries but what are they for?:

 ls /dev/pts
0  10  12  14  16  18  2   21  23  25  27  29  30  32  4  6  8  ptmx
1  11  13  15  17  19  20  22  24  26  28  3   31  33  5  7  9

Basically they are pseudo-terminals, whereas a tty is a physical terminal (think of Ctrl + Alt + F1 being tty0 and F8 being tty7).

An easy way to test this is to keep opening new terminal windows (Ctrl+Shift+t)

Then type "tty" and you'll see each one has a higher /dev/pts number.

Pretty much anything such like ssh, bash that uses terminal input or output will create it's own /dev/pts.


Tags:

dev, pts, linux, entries, ls, ptmx, pseudo, terminals, whereas, tty, terminal, ctrl, alt, quot, ll, ssh, bash, input, output,

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