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Top Forums Shell Programming and Scripting How to use sed to search a particular pattern in a file backward after a pattern is matched.? Post 302833627 by saurabh kumar on Wednesday 17th of July 2013 01:44:17 PM
Old 07-17-2013
How to use sed to search a particular pattern in a file backward after a pattern is matched.?

Hi,
I have two files file1.txt and file2.txt. Please see the attachments.

In file2.txt (which actually is a diff output between two versions of file1.txt.), I extract the pattern corresponding to 1172c1172. Now ,In file1.txt I have to search for this pattern 1172c1172 and if found, I have to search backward for the path and print the corresponding path (/home/saurabh/file1.txt). Please note that there may be many entries between the path(/home/saurabh/file1.txt) and the line containing the pattern 1172c1172.

file1.txt:
Code:
/home/saurabh/file7.txt
117c117
<          
---
>          

/home/saurabh/file1.txt
76c76
---
79c79
---
1172c1172
<          apple, banana, orange
---
>          apple, banana, mango

/home/saurabh/file7.txt
117c117
<   	silent, helpful       
---
>  	silent

file2.txt:
Code:
2388,2391d2387
< 1172c1172
< <          apple, banana, orange
< ---
< >          apple, banana, mango

Any suggestions will be highly appreciated.

Thanks,
Saurabh

Last edited by Scott; 07-17-2013 at 02:58 PM.. Reason: Removed attachments. It's really not necessary to attach such small files
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
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