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Full Discussion: Multiple Line awk search and replace
Top Forums Shell Programming and Scripting Multiple Line awk search and replace Post 302850239 by bobbygb2003 on Wednesday 4th of September 2013 10:16:20 AM
Old 09-04-2013
Multiple Line awk search and replace
I have a log file that contains many lines but contains the following line three times:

Code:
related_pin : "t_bypass";




Here are the 3 occurrences and the two lines after from my file.txt:


Code:
related_pin : "t_bypass";
        sdf_cond : "rstq_b";
        timing_sense : negative_unate;

        related_pin : "t_bypass";
        sdf_cond : "rstq_b";
        timing_sense : positive_unate;

        related_pin : "t_bypass";
        timing_type : recovery_rising;
        rise_constraint (constraint_template_7x7)



This is an output log and the first two occurrences can occur in either order. The difference being in the second line. I would like to replace the middle line in the first two occurrences as such, notice that one has the ! and the other does not:

Code:
related_pin : "t_bypass";
        sdf_cond : "t_bypass && rstq_b";
        timing_sense : negative_unate;

        related_pin : "t_bypass";
        sdf_cond : "!t_bypass && rstq_b";
        timing_sense : positive_unate;

        related_pin : "t_bypass";
        timing_type : recovery_rising;
        rise_constraint (constraint_template_7x7)



I simplly want to change the sdf_cond line without losing anything. So its almost like I want to do the search for the first line and do a conditional on two lines after and then replace the middle line if the condition is met. I can use sed if that is easier, my problem has been the new line separators.

Moderator's Comments:
Mod Comment Use code tags!

Last edited by radoulov; 09-04-2013 at 11:54 AM..
 

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