Question

I want to do something like this:

echo "abc edg.txt" | awk -F. '{print $0"---"$1}'

I expect the result should be:

abc edg—txt

but it turns out to be:

abc edg.txt—abc edg

What is causing this behavior, and how can I fix my code to produce the output that I expect?

Answer 1

In awk, $0 evaluates to the whole record, and field indexes are one-based.

You probably want to do:

$ echo "abc edg.txt" | awk -F. '{print $1"---"$2}'
abc edg---txt