Here's where the manual introduces the convention: https://www.gnu.org/software/gawk/manual/gawk.html#Variable-Scope https://www.gnu.org/software/gawk/manual/ga

Here's where the manual introduces the convention: https://www.gnu.org/software/gawk/manual/gawk.html#Variable-Scope https://www.gnu.org/software/gawk/manual/gawk.html#Variable-...