I am new to linux and I have a question?

How can I write a simple bash script that determines the number of pseudoterminals being used on a system? Can someone help me out with a sample code?
Thanks for your time.

RR.

check the output of who -a command. that's one way

My system has tty and pts, but no pty

You will probably get better information if you tell us what you are trying to do---eg do you want to know who is logged in?

I made the original post to get some ideas from anyone out there. Well...no luck! However, I talked to some clever linux aficionados at Orange County Linux Users Group here in Southern California and here is the sample codes:! I tried them all out and they worked like a charm.

One way:
> $ ls /dev/pts/* | wc -l
>
> Another:
> $ finger | grep -wc pts
>
> One more way:
> $ ps faux | tr -s ' ' '\t' | cut -f 7 | grep -w pts | sort | uniq |
wc -l
>
Wow, that's a lot of methods!

I think the most elegant one was `w -h | wc -l`

I figured out yet another one:
who -q | grep \#

If you want only the number:
who -q | grep \# | sed 's/.*=//'

or:
u=`who -q | grep \#`; echo ${u/*=/}


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