find the total number of pseudo terminals of all logins

RajRed · 04-16-2006, 10:53 PM

how do I find the total number of the pseudo terms used on the system?

Thanks.

norbert74 · 04-17-2006, 03:28 AM

You may look into /dev/pts/. There you find all pseudo terminal slave devices currently being used.
The total number is the highest number there + 1
Watch the changes by opening and closing xterms. More info in "man pts".

Norbert

archtoad6 · 04-17-2006, 09:03 AM

Not quite. #'s can be skipped due to closing of terminals, from my system a few moments ago:

Code:

$ ls /dev/pts/
0  1  2  3  4  5  7

Notice that '6' is missing.

What will work is: ls /dev/pts/ | wc -l

Code:

$ ls /dev/pts/  | wc -l
8

This counts the # of open terminals reported.

RajRed · 04-17-2006, 07:11 PM

When I did 'ls /dev/pts | wc -l', it also counts the '.' and '..'. How do I exclude the '.' and '..' or not to count these two?

norbert74 · 04-18-2006, 12:42 AM

This should count only numerical entries in the directory:
ls /dev/pts | grep "[0-9]" | wc -l

archtoad6 · 04-18-2006, 04:30 AM

Your ls has probably been aliased to something like ls -a, try using:

Code:

 'ls' /dev/pts/ | wc -l

The quoting bypasses the aliasing.