Want to search value and two previous value

Shell Programming and Scripting
1

I am using following command to get the search value and previous line value.
sed -n -e 'N; /resize/p' alter_PU1M03.log

Please let me know how can I get the search string + previous two values and combine the output to one line.

I am using HPUX 11.11

2 
 awk '/resize/{printf "%s %s %s\n", last2, last1, $0 }
{ last2 = last1
  last1 = $0
}'  FILE
3

Thanks it works, I really appreciate your help.

4

awk:

nawk '{
if(index($0,"pattern")!=0)
	print l2" "l1" "$0
else
{
	l2=l1
	l1=$0
}
}' filename

sed:

pat=$1
sed -n '/'$pat'/ !{
H
}
/'$pat'/ {
H
x
s/\(.*\)\n\(.*\)\n\(.*\)\n/\2 \3/
p
}' filename