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Top Forums Shell Programming and Scripting substitute a string on a specific position for specific lines Post 302480562 by anurag.singh on Wednesday 15th of December 2010 09:24:31 AM
Old 12-15-2010
@ctsgnb
Good way to get 2nd last line no but I guess above script needs to be modified as below:

Ignore line 1,2 and the last one (No change)
For the 3rd line, Replace only if TOCHANGE is in 12th to 19th position.
For other lines (4th - 2nd last), Replace only if TOCHANGE is in 9th to 16th position.
Code:
 
sed -e '3s/\(...........\)TOCHANGE\(.*\)/\1ABCABCAB\2/' -e '4,'"$(( $(wc -l < inputFile)-1 ))"'s/\(........\)TOCHANGE\(.*\)/\1ABCABCAB\2/' inputFile


Last edited by anurag.singh; 12-15-2010 at 10:31 AM..
 

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ED(1)							      General Commands Manual							     ED(1)

NAME
ed - editor SYNOPSIS
ed file OPTIONS
- Suppress line/byte count messages (for in scripts) EXAMPLES
ed prog.c # Edit prog.c echo '1,$p' | ed - file # Odd way to write 'cat file' DESCRIPTION
Ed is functionally equivalent to the standard V7 editor, ed. It supports the following commands: (.) a: append (.,.)c: change (.,.)d: delete e: edit new file" f: print name of edited file" (1,$)g: global command (.) i: insert (.,.+1)j: join lines together (.) k: mark (.) l: print with special characters in octal (.,.)m: move (.,.)p: print q: quit editor" (.) r: read in new file (.,.)s: substitute (1,$)v: like g, except select lines that do not match (1,$)w: write out edited file Many of the commands can take one or two addresses, as indicated above. The defaults are shown in parentheses. Thus a appends to the cur- rent line, and g works on the whole file as default. The dot refers to the current line. Below is a sample editing session with comments given following the # symbol. ed prog.c # Edit prog.c 3,20p # Print lines 3 through 20 /whole/ # Find next occurence of whole s/whole/while/ # Replace whole by while g/Buf/s//BUF/g # Replace Buf by BUF everywhere w # Write the file back q # Exit the editor Ed is provided for its sentimental value. If you want a line-oriented editor, try ex. If you want a good editor, use elle, elvis, or mined. SEE ALSO
elvis(1), elle(9), mined(9). ED(1)
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