1 03/31/83 substr
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3 Syntax: substr STR I N
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6 Syntax as active function: substr STR I N
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9 Function: returns the portion of STR starting with the character in
10 position I and continuing for N characters where I and N are decimal
11 integers; I must be greater than zero and N must be greater than or
12 equal to zero. If N is omitted, the remainder of STR is returned. If
13 I is greater than the length of STR, the null string is returned. If N
14 is greater than the remainder of STR, the remainder is returned.