Using diff to compare file with common lines, but at different line numbers
I wouldn't normally ask this type of question, but I've had a good look on google and can't find the answer, or any decent examples to get me started!
I'm trying to analyse some files containing a few thousand lines of sql commands each. Both of them are used to create a database with the same structure, except one has data in and the other only has the schema. I want to be able to compare them, so that I can output the extra lines of code used to insert the data into the database. From this I hope to replace it with my own data.
I'm aware that I can do this with the diff tool, but can't figure out which options are needed, really I just want an example, can anyone help? This is what I've tried so far:
diff -wbi kernel/setup/packages/blog/sql/mysql/blog.sql kernel/sql/mysql/cleandata.sql > out
diff -wbi kernel/sql/mysql/cleandata.sql kernel/setup/packages/blog/sql/mysql/blog.sql > out
neither give me the right results. I think this is something to do with the common lines not necessarily appearing on the same line numbers in each file.
Thanks in advance for any help!
Having been a day or 2, I'll suggest using vimdiff instead of diff alone. It's a lot more elegant, and I think will give you the results you are looking for, or at least, closer to it.
If the data is simply in a different file, and you want to "truncate" it to the bottom of the other file, you can cat the first file into the second:
cat /home/whatever/file1 >> /home/whatever/file2
Hmmm, had a quick go and it seems a lot nicer to user than diff. Need to read some docs to figure it out, but it appears to "know" what I want
In the end these tools didn't do exactly what I wanted them to do. I started to write a script, which seems to work, but doesn't like the long lines of text (sed doesn't that is) that I ended up dealing with. All this became too timeconsuming and I was starting to lose track of my objectives here, so I'm changing tactics. Here's my script for anyone interested:
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