awk to pick out more than one line

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# 1  
Old 03-24-2010
Computer awk to pick out more than one line

This really is a dummy question but I'm stuck and out of time... I have a large file and out of it I only want to pick out lines starting with either "Pressure" or "N". I still need these lines to be in their original order.

example of text
Pressure 3 
N 2
N 3
bla bla
bla bla
Pressure 4
bla bla
N 5

I would like
Pressure 3
N 2
Pressure 4
N 5

I can use awk (see below) but can only get the coding correct to pick out one line at a time.

awk '/Pressure/, /[Pa]/' all > check.txt
awk '/  N  /' all  > check.txt

I need awk to scan a line at a time so that the Pressure lines and N lines are still printed in the correct order.

Any help appreciated,


Last edited by zaxxon; 03-24-2010 at 10:40 AM.. Reason: use code tags for data/logs etc. too please, ty
# 2  
Old 03-24-2010
sed -n '/^Pressure/p;/^N/p' file

# 3  
Old 03-24-2010
awk '/^Pressure/ || /^N/' infile

You don't even need awk, grep would do it too:
grep -E "^Pressure|^N" infile

# 4  
Old 03-24-2010
Fantastic -thanks!
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