Shell Programming and Scripting

try this:

Code:

 join -v1 -v2  1.txt 2.txt

Since there were 2 columns, we used -v1 and -v2. If there were three should we add -v3?

am I missing the logic?

Could you please explain the logic?

It worked. Thanks

I really have to ask: what does the "Venn" in the subject "Venn results using awk" mean?

I was talking about Venn Diagram outputs.

Usually, in a venn diagram u can interpret how many records fall into how many categories in a pictorial fashion.

There is this program called genevenn that runs on Java to do this task. But it takes only 1 column. You can try it. Just do it with alphabets. You dont have to give it gene names.

Just go to google and say genevenn.

HTH

Thanks. I've updated the subject to include "diagram". I'm sure if I googled for "venn results using awk" I'd have found your thread, mostly thanks to our good page rank. But to the uninitiated it looked like a typo

We're not talking columns (=fields) but files. As max 2 files can be joined, -v1 prints unpaired lines from FILE1, -v2 same for FILE2, -v3 does not exist. The error message

Code:

join -v1 -v2 -v3 y.txt x.txt
join: invalid field number: `3'

is somewhat misleading.

In awk, NR tells you the overall record number and FNR tells you the record number of the current file. Also the variable FILENAME gives you the name of the current file.

In the BEGIN pattern, have a variable called PREV_FILENAME

So
OK

Theoretically, we dont even need NR, FNR check and can do it for as many files as we need.

On END pattern, vomit out the result.

If an array element is empty, then it is empty (contra case).

OK