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Replace text in a file

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Replace text in a file

 
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  #1
Sep 7th, 2006
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
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Re: Replace text in a file

 
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  #2
Sep 7th, 2006
Here's one way of approaching your problem (pseduo-code):
Shell Scripting Syntax (Toggle Plain Text) 
  1. while !eof {
  2.    increment fileline
  3.  
  4.    while (stillgoing) {
  5.       increment index
  6.       read line fileline from file
  7.       if (compare string to one in database = FALSE)
  8.           stillgoing = FALSE
  9.       if (index > 5)
  10.            insert lines in file
  11.    } end while
  12. } end while

Just off the top of my head. Don't take it too literally.
"Technological progress is like an axe in the hands of a pathological criminal."
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Re: Replace text in a file

 
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  #3
Sep 8th, 2006
awk works for this pretty well -
Shell Scripting Syntax (Toggle Plain Text) 
  1. awk '{
  2.         print $0
  3.         if($0=="Line2") {print "INSERTLINE2"}
  4.         if($0=="Line3") {print "INSERTLINE3"}
  5.        }' file > newfile
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Re: Replace text in a file

 
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  #4
Sep 11th, 2006
Shell Scripting Syntax (Toggle Plain Text) 
  1. sed '
  2. /Line1/{
  3. N;N;N;N
  4. s/^Line1\nLine2\nLine3\nLine4\nLine5$/Line1\
  5. Line2\
  6. INSERTLINE1\
  7. Line3\
  8. INSERTLINE2\
  9.  Line4\
  10. Line5\
  11. /
  12. }' rc.conf
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