Shell Programming and Scripting

This is what I have so far.

Code:

xrandr | grep connected | grep -v disconnected | awk '{print $1}'

This is my output.

Code:

LVDS1
TV1

How can I awk for line number 2. The only output I want is TV1.

Try:

Code:

xrandr | awk '$2=="connected"{s=$1} END{print s}'

( or stick | tail -1 onto the end of your string of commands )

and

Code:

| sed -n '2p'

works also.

That works great . Can you please explain how it ignores "LVDS1". I know it checks field 2 for connected with $2=="connected", then it stores field 1 this {s=$1}, then it prints field 1 with this END{print s}. I just can't figure out how it ignores "LVDS1".

When I run this I get:

Code:

$ xrandr | grep connected | grep -v disconnected | sed -n '2p'
TV1 connected (normal left inverted right x axis y axis)

Did you do something else? I would still have to pass it to awk because I want TV1.

Hi, it does not ignore LVDS1, while read the file it stores field 1 of each "connected" line in variable s. So after all lines have been read, s will contain the last value that was found. Then in the END section this variable will get printed..

An aside to save a process. Instead of:

Code:

grep connected | grep -v disconnected

you can do:

Code:

grep '\<connected\>'

Can you please elaborate? I don't understand what you are saying.