Tcl scripting using grep,sed - sed

Question

I have to find a particular string first, then i need to pick up a value in that string, which is changing aftrr every run. How can i do this.
Stage pro begin_time { size is 54mb and 3 sec }
Stage pro1 begin_time {.....}
I have very big file. I have to specifically look for begin_time string first then look for its value and store it somewhere. How can i do this.
I have tried it using grep but i don't know how to store value of 3 here. Similarly i have many cases here, how can i handle this situation

Answer 1

Thanks for the reply. I want to store it as value 3 with respect to pro, then some other value corresponding to pro1. Second, time mentioned here is a start time. I have same information for each of the stage pro,pro1 but with an end time. I have to extract end time as well. Then i have to caluculate net time elapsed, i.e. time between start time and end time

Answer 2

cat aaa
Stage pro begin_time { size is 54mb and 3 sec }
Stage pro1 begin_time {.....}
cat aaa |awk '$3=="begin_time" {print $9}' |grep .
3
if you wish to store it :
var=$(cat aaa |awk '$3=="begin_time" {print $9}' |grep .)
echo $var
3
If you wish to map pro with 3 then,
cat aaa | awk '$3=="begin_time" {print $2,$9}' |grep .
pro 3