You can also pull multiple columns with one command. The following example pulls the 3rd column and then the 1st column.
If you separate the arguments with a comma as in the example above they will be concatenated with space between the items. You can also use a space as in the example below and the items will have no space between them.
If you wanted to add a separator between those columns, you can add some text in quotes and it will be output as-is. In the example below, I'll add a pipe character between the two columns. If you get an error about an unmatched comma, you are probably trying to run this in a csh shell instead of a bash shell.
These shells behave a little differently. Here's the error you'll get. One solution is to run this command from bash. You can also put your awk options inside of an awk script. Here's some example output for doing that.
FS is the field separator, we've set it to a comma. The Awk Manual. Old revisions. Learn to Code by Making Art Learn programming while your create computer art by copying code from my free guide. In my case, the CSV files are in the following format: "field1","field2","field3" To view the 3rd field of every line, you can use the following command.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Compare two csv files and append value using awk [closed] Ask Question.
Asked 5 years, 1 month ago. Active 4 years, 9 months ago. Viewed 2k times. I have two files as follows: file1. Premraj Premraj 1, 1 1 gold badge 14 14 silver badges 21 21 bronze badges. It is better if you read an awk book first and come back with specific separate questions for things you don't understand. Active Oldest Votes. This is much simpler than the linked question. This is useful to print comma-separated output by default.
Using AWK on CSV Files
The two will be identical only while the 1st file is being read. This is the corresponding 4th field of the first file. Thats probably not very readable, well While this does explain the code the OP posted, that code will not solve his question. I know, which is why I haven't done anything but leave a comment :.
It's just that the code is irrelevant to his actual problem.Friday, December 28, awkcomparenawk 28 Comments. In the same way, what could be the change in the above command to print lines which are present in both? For hai, You simply change! This will print the similar values in both and exclude the ones which do not match in the first column. Good post How about, for instance, if you wanted to match column 1 in file 1 to column 2 and then 3 and then 4 in file 2, and only output any matching columns from file 2?
Nice example. My requirement is identify the line by line difference between the two files and create a third file containing the identified delta.
If any line is new in file 2, then 'I' should be appended to the text of that line and if any line is updated in file2 i.
Shell Programming and Scripting
It quite complex and if you provide me an input. I can try for something. Thanks for your help! It is actually the opposite NR - This is the number of input records awk has processed since the beginning of the program's execution.
NR is set each time a new record is read. FNR is incremented each time a new record is read. It is reinitialized to zero each time a new input file is started. Thanks for your useful explanations. It yielded the same result. In awk, an index can be an integer as well as a string so perhaps the increment isn't needed since the index and value of each item in the array are automatically updated with every new record.
What do you think? I have two files file1 and file2 with content as follows File1: Hai Welcome Server1 If they are not same then update file2 IP with the corresponding IP from file I need to compare two excel files, using unix script.
Thanks, vijay sarathi for so usefull post, it helped me a lot. I was trying to implement this code using a file. Hi, I have two files cat a1. But I want when output like 1 Without Sort in one command repeated entries from A1. Thanks for providing this informative information you may also refer. File-2 7!
Expected result: 7! Hi, I would like to compare two files and print down the value which is not common in both the files. How can I achieve that? I'm trying my best to learn linux shell and hack things out myself.
But this part has me stuck. I have two CSV files with hundreds of rows each. CSV 1 looks like this: name, email, interest CSV 2 looks like this: email, name only I'm trying to write a script to compare the files with email looking for duplicates and remove it.
The awk code will then read this as data delimited by commas followed by any number of spacesand will, for the cases that the second column is not equal to the fourth column, set the second column to the character D. The code then prints out the first two column the second possibly modified with a comma as delimiter. Sign up to join this community.
The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Compare 2nd columns of two csv files [closed] Ask Question. Asked 2 years, 6 months ago. Active 2 years, 6 months ago. Viewed times. Vikas Prajapati Vikas Prajapati 9 1 1 bronze badge. You still haven't described the mechanism for translating the input to the output.
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I've written a script in Python, but it's not fast enough for this job. I'm thinking line-by-line processing would work better. I have two files with two columns and potentially hundreds of millions of lines bioinformatics.
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 namecount 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 file2the second entry is the count for that name from file 1; and the third entry is the count for that name from file2preserving headers.
If someone could correct the awk script using the same basic flow syntax as in the above, that would be excellent and much appreciated. You would be much better off if your input is sorted on the first column, since then you can directly use the join command:.
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I didn't use awk alone, but if I understood the gist of what you're asking correctly, I think this long one-liner should do it EDIT: As tripleee points out, the above fails if the two initial files are unsorted.
Here's an updated command to fix that. It punts the header line and sorts each file before passing them to join Learn more. Asked 7 years, 7 months ago.
Active 6 years, 10 months ago. Viewed 4k times. Sicco 5, 3 3 gold badges 39 39 silver badges 56 56 bronze badges.
Abhishek Sharma Abhishek Sharma 65 2 2 silver badges 8 8 bronze badges. A single example is not a description of a problem. Simply trying to describe the problem in detail will often lead directly to the obvious solution. Rather than using awkI would talk a look at the options to the diff command, which allow for such line-by-line formatting.
GNU diff only, though? Active Oldest Votes. One way with awk : script. The awk portion takes that output and replaces combination of the 3rd and 4th columns to either "Match" or "Unmatch" based on if they do in fact match or not. I had to make an assumption on this behavior based on your example.
This last part might not be necessary for you. Costa Costa 1, 1 1 gold badge 12 12 silver badges 25 25 bronze badges. At a minimum, you'll need to trim those header lines.
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I know there are my of the same questions already answered on this platform but I tried all the solutions for several hours and I cannot find my mistake.
So I would appreciate any hint or help for what I am doing wrong. I have two files of which I like to filter out the lines of file 2 that match column 1 in file 1. In my opinion, the proposed solution for the same questions should work but unfortunately they do not.
My files are tab-separated. I know this might be a stupid question, I apologize in advance. However I do not seem to be able to figure it out. The getline at the start reads file2. The "main" section of the code then reads the content of file1. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top.
Home Questions Tags Users Unanswered. Asked 3 years, 2 months ago. Active 3 years, 2 months ago. Viewed 11k times. I do not understand why. Strange, oddly works in the BSD awk. Just checked on my system, running ubuntu Nick Sillito I tried again but it does not work for me for any reason, this is really strange.
Active Oldest Votes. Example output: apple 5. Nick Sillito Nick Sillito 1, 5 5 silver badges 10 10 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.