Shell Programming and Scripting

I have 2 files a & b
Contents of a are:-
--------------------------
This is a Good Boy
This is a Good Boy
This is a Very Good Boy
This is a Good Boy
This is a Good Boy
---------------------------
The contents of b are
-------------------
This is Testing Beta
--------------
I have a piece of code :-

i=`cat a|grep "Very Good"`
echo $i
perl -pi -e 's/^(This is a Very Good Boy)/$1."\n".`cat b`/e' a

Now the above piece of code works perfectly well. That is String 'This is Testing Beta', needs to be added just under the string ''This is a Very Good Boy', followed by the remaining lines of code from file a. However, I want to refrence Shell variable 'i' instead of hard coding the string 'This is a Very Good Boy'? Please help urgent.

Any other forms of help are also welcome, I mean if we could do the above effort with just Shell,awk,sed or combination of all 3. All your help is highly appreciated.

Regards
Sri


The Final Output Should look something like this. I mean the final contents of File a
----------------------
This is a Good Boy
This is a Good Boy
This is a Very Good Boy
This is Testing Beta

This is a Good Boy
This is a Good Boy
-------------------------

Something like that:

Code:

perl -pi -e 's/^($ENV{i})/$1."\n".`cat b`/e' a

Or:

Code:

myVar="This is a Very Good Boy"

sed '/'$myVar'/r b' a

Regards

Something is going on with the way this forum is presented to my PC and it is no longer so easy to find a way to reply...

But you have the answer in one of the other replies already...

the %ENV hash (built into perl) holds all environment vars. Inside your perl script you can use $ENV{i} and that will be the value of the shell variable 'i'

Hi Buddy,

Thanks for the quick reply. But this is not working the way I want. The output using the above piece is

This is Testing Beta
This is a Good Boy
This is Testing Beta
This is a Good Boy
This is Testing Beta
This is a Very Good Boy
This is Testing Beta
This is a Good Boy
This is Testing Beta
This is a Good Boy

Please note that the variable i is a Shell variable, which has the output of Unix Command.
i=`cat a|grep "Very Good"`

Please help buddy its a emergency.

This is definitely not encouraged in the forum. Please

Here is one more,

Code:

awk -v var=$i 'BEGIN { while (getline < "second_file") arr[i++]=$0 } { if(match($0, var)) { for (j=0; j<i ;j++) { printf "%s\n%s\n\n", var, arr[j] }; next } print }' first_file