1 # DP: Clarify documentation about substring expansion
7 If \fIoffset\fP evaluates to a number less than zero, the value
8 is used as an offset from the end of the value of \fIparameter\fP.
9 +Arithmetic expressions starting with a - must be separated by whitespace
10 +from the preceding : to be
11 +distinguished from the \fBUse Default Values\fP expansion.
12 If \fIlength\fP evaluates to a number less than zero, and \fIparameter\fP
13 is not \fB@\fP and not an indexed or associative array, it is interpreted
14 as an offset from the end of the value of \fIparameter\fP rather than