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Compare and merging the differences in text file

 
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# 1  
Old 11-08-2011
Compare and merging the differences in text file
Hi

i have gone through some sdiff command it shows the differences side by side and its really awesome

Code:
file 1:
this tool is for 
checking the differ
merging with flower pots documentation

Code:
file 2:
this t   ool is for 
checking the differ
mergin    g with flower pots documentation

we can clearly say that there is difference in line 1 and line 3 of file 2

Code:
diff -e file2 file1 > output

$ diff -e file2 file1 > output
$ (cat output && echo w) | ed - file2

file1 and file2 are exactly same

1 ) i want to include a flower pot documentation like below example


Code:
line 1,3 of file 2 is changed 

file2 should look like this:


************** my change  start point *********************
this tool is for
************** my change  end point *********************
checking the differ
************** my change  start point *********************
merging with flower pots documentation
************** my change  end point *********************

start and end tags are fixed strings , we can assign them to a STRING1 and STRING2 but how can we print while merging

any help is much appreciated , thanks
Last edited by rakeshkumar; 11-08-2011 at 04:14 PM..
# 2  
Old 11-08-2011
Code:
nawk 'FNR==NR{f2[FNR]=$0;next} {if ( $0 == f2[FNR]) print; else printf("%s\n%s\n%s\n", s,$0,e)}' s='** my change start point **' e='** my change end point **' file2.txt file1.txt

This User Gave Thanks to vgersh99 For This Post:
rakeshkumar
# 3  
Old 11-08-2011
Hi Vgersh99

i could not understand your code but its working perfectly on terminal , really great coding

can you please explain below code and how does it taking pointers to two file same time

Code:
nawk 'FNR==NR{f2[FNR]=$0;next}[

Last edited by rakeshkumar; 11-08-2011 at 05:49 PM.. Reason: rework
# 4  
Old 11-08-2011
FNR==NR{f2[FNR]=$0;next}
This piece of code gets executed when processing the first file specified on a command line - in your case it's file2.txt
It populates an array f2 index my current record/line number (which is stored in the variable FNR) with the entire current record/line (store in $0).

The rest of the script simply compares the corresponding lines from file1.txt with previously array stored lines from file2.txt.
Last edited by vgersh99; 11-08-2011 at 06:32 PM..
# 5  
Old 11-09-2011
thanks vgersh

i want to make the output like below
Code:
************** my change  start point ********************* 
*this t   ool is for   (Note: this is old code,* at beginning indicates old code is commented ) 
this tool is for
************** my change  end point ********************* 
checking the differ 
************** my change  start point ********************* 
*mergin    g with flower pots documentation
merging with flower pots documentation 
************** my change  end point *********************

Code:
nawk 'FNR==NR{f2[FNR]=$0;next} {if ( $0 == f2[FNR]) print; else printf("%s\n%s\n%s\n%s\n", s,$f2[FNR],$0,e)}' s='** my change start point **' e='** my change end point **' file2.txt file1.txt

i tried with below code but it prints the same line twice where as i want the line1,3 from file2 needs to be printed but it prints line1,3 from file1
Code:
************** my change  start point ********************* 
this tool is for 
this tool is for 
************** my change  end point ********************* 
checking the differ 
************** my change  start point ********************* 
merging with flower pots documentation 
merging with flower pots documentation 
************** my change  end point *******************

Last edited by rakeshkumar; 11-09-2011 at 02:54 AM.. Reason: incorrect format
# 6  
Old 11-09-2011
Code:
nawk 'FNR==NR{f2[FNR]=$0;next} {if ( $0 == f2[FNR]) print; else printf("%s\n*%s\n%s\n%s\n", s,f2[FNR],$0,e)}' s='** my change start point **' e='** my changxe end point **' file2.txt file1.txt

This User Gave Thanks to vgersh99 For This Post:
rakeshkumar
# 7  
Old 11-09-2011
thanks lot vgersh ,

why $f2[FNR] not working but $0 works ?

one more question using sdiff with my prog1 and prog2 shows lots of differences which also considering the space , i went through the man pages of sdiff and found -W flag
Code:
sdiff -W prog1 prog2 shows only differences which i want ignoring the white spaces


how can we implement the same flag in Awk , i went through manual pages of awk but it shows alot of things with -W
Last edited by rakeshkumar; 11-09-2011 at 06:52 AM..
 
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