Save modifications in place with awk

Question

I am learning awk and I would like to know if there is an option to write changes to file, similar to sed where I would use -i option

Answer 1

@sudo_O has the right answer.

This can't work:

someprocess < file > file

The shell performs the redirections before handing control over to someprocess (redirections). The > redirection will truncate the file to zero size (redirecting output). Therefore, by the time someprocess gets launched and wants to read from the file, there is no data for it to read.