How to compare two files using scripts-AWK?

How to compare two files using scripts-AWK?

The headers are name, count in each file. I need to produce a tab-delimited file where: the first entry of each row is from the name column, but only those names that are in both file1 and file2, the second entry is the count for that name from file 1; and the third entry is the count for that name from file2, preserving headers.

What to do if two columns in two files are the same?

If fields $2 and $3 are the same in both files, print $0 of file2. Here’s an example: Notice that all couples $2,$3 in file1 are contained in file2 and the number of rows of the output file is the same of file1. There are a lot of questions with similar problems, I know that, but all the answers were not useful.

How to compare two files, print match and difference?

And print first the second field of f2.txt, then print the entire line of f1.txt. And for no match found on f2.txt to state “Not Found” and then print f1.txt entire line. F1.txt This was very useful . I have changed a bit to get data between 2 files and only have 1 column in each file .

What’s the difference between two files in Ubuntu?

The two files (file1, file2) are similar, tab-delimited, with the first column containing strings of letters and numbers and the second column containing integers. The headers are name, count in each file.

How to process second input in AWK Stack Overflow?

When NR != FNR it’s time to process 2nd input, file1. here we print the line of file1, and take column1 as index, find out the value in array (a) print. in another word, file1 and file2 are joined by column1 in both files. you see the trick of FNR==NR check.

How to concatenate lines from two different files in AWK?

What follows is the answer I was looking for (and that I think most people would be), i.e., simply to concatenate every line from two different files using AWK.

How to handle multiple files in AWK array?

A while ago I stumbled in a very good solution to handle multiple files at once. The way is to save in memory the files in AWK arrays using the method: For post data treatment, is better to save the number of lines, so: f2rows and f1rows will hold the position of the last row.

How to compare two decimal numbers in BASH / AWK?

While there is no clear solution to this (discussion thread 1 and thread 2 ), I used following partial fix by rounding off floating point results using awk followed by use of bc command as in Dennis’s reply and this thread

Is there a way to compare two files?

I am checking that the files match, so it matters that the value appears on the same line in both files, not that it appears anywhere. However, it would read the whole of file1 first and put it in memory.. It seems like it will work well enough and was the fastest of the methods that worked.

Why is the Order of input files reversed?

Note that the order of input files is reversed because I want the first line of file1 that does not match file2. This just prints the first line of file1. Even if it did work, I think that this just tells me that the value is, or is not, in the file, not if the lines match. I am sure I could do a loop with read, but that would be slow.