Just looking for the difference between 2>&-, 2>/dev/null, |&, &>/dev/null and >/dev/null 2>&1 and their portability with non-Bourne shells like tcsh, mksh, etc.
How can I use AWK in the following situation?
I want to concatenate lines that start with the same column.
Please advice how to use AWK in this situation?
How to concate lines that start with same column.