funcname-function-name

$FUNCNAME function name

To know the current function name, we must set it manually for POSIX, and we prefer to use the environmen variable $FUNCNAME because it matches the automatic Bash environment variable $FUNCNAME.

To make the code compatible on POSIX and Bash:

foo() { 
    FUNCNAME=${FUNCNAME:-foo}
    echo "$FUNCNAME"
}