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How to make diff show differences one line at a time and not group them?

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Top Forums Shell Programming and Scripting How to make diff show differences one line at a time and not group them?
# 8  
Old 01-11-2012
if the "+" or "-" at the start of your output line is important, ignore this post!


If the files are already in sorted order or you are prepared to sort the files for this purpose, then try the unix "comm" command. "man comm".


For the data sample posted there is a quick and dirty approach:

Code:
cat file1 file2|sort|uniq -u

line 3 diff
line 3 diff.
line 4 diff
line 4 diff.
line 5 diff
line 5 diff.

This User Gave Thanks to methyl For This Post:
mmr11408
# 9  
Old 01-11-2012
Thank you. The leading - and + are used to identify the entries coming from files and are important. I am going to try this and see if that works in all cases (I have multiple files that are being compared and reported).

Code:
comm -3 file1 file2 | sed 's/^/-/;s/^-\t/+/'

# 10  
Old 01-11-2012
Try this... you got to test it out... and yeah this is dirty!
Code:
diff -y --suppress-common-lines file1 file2 | sed 's/|[ \t]*/\n+/;s/^[ \t]*>[\t ]*/+/;s/\(.*\)</-\1/;s/^[^-+]/-&/'

--ahamed
# 11  
Old 01-11-2012
Ok, how about this one:

Code:
diff -y file1 file2 | grep '|' | sed 's/\s*|\s/\n/g' | awk '!(NR%2) {$0=$0"\n"} 1'
line 3 diff
line 3 diff.

line 4 diff
line 4 diff.

line 5 diff
line 5 diff.

# 12  
Old 01-12-2012
Thanks for all your help. There was a little gotcha with each approach so I ended up using colors to distinguish between the entries from the files.
# 13  
Old 01-12-2012
There has been considerable interest in this thread.

Please post your final solution. The colours (or colors for USA folks) component of the solution is intriguing.
# 14  
Old 01-30-2012
The script compares different type of files (properties files that have many stanzas, list of stanzas, files that contain crontab listing, ...)

It creates an HTML email and I simply have it create a table and mark lines that start with '-' in one color and the ones starting with '+' a different color. As I am expanding its use, it would be ideal to have diff report differences one line at a time.
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