Replace text in a file
 

Greetings,

Hey guys, I am trying to make a shell script that will scan for a certain 5 lines of text in a file, modify it by adding two lines in the middle and replacing that section of text in the file.

For example read rc.conf for:
Line1
Line2
Line3
Line4
Line5
That match the exact lines

and replace that section or match with

Line1
Line2
INSERTLINE
Line3
INSERTLINE
Line4
Line5

Mainly i am trying to add a new case statment inside an if loop automatically using a shell script. I have tried reading info on awk usage but cannot find anything that matches whta I am trying to accomplish. Any help would be greatly appreciated.

Regards,

S Tompkins

Re: Replace text in a file
 

Here's one way of approaching your problem (pseduo-code):

while !eof {

   increment fileline



   while (stillgoing) {

      increment index

      read line fileline from file

      if (compare string to one in database = FALSE)

          stillgoing = FALSE

      if (index > 5)

           insert lines in file

   } end while

} end while

Just off the top of my head. Don't take it too literally.

Re: Replace text in a file
 

awk works for this pretty well -

awk '{

        print $0

        if($0=="Line2") {print "INSERTLINE2"}

        if($0=="Line3") {print "INSERTLINE3"}

       }' file > newfile

Re: Replace text in a file
 

sed '

/Line1/{

N;N;N;N

s/^Line1\nLine2\nLine3\nLine4\nLine5$/Line1\

Line2\

INSERTLINE1\

Line3\

INSERTLINE2\

 Line4\

Line5\

/

}' rc.conf