Would somebody please explain?

[Cliff Stanford]

In article <1991Apr21.023416.5795 at mp.cs.niu.edu> rickert at mp.cs.niu.edu (Neil Rickert) writes:
>In article <1991Apr21.001702.5661 at umbc3.umbc.edu> rouben at math16.math.umbc.edu (Rouben Rostamian) writes:
>>The command:
>>    expr "Match" : "Ma"
>>returns 2, as it should, since the first two characters of "Match" and "Ma"
>>coincide.  Now, would somebody please explain why the command:
>>    expr "match" : "ma"
>>complains of a "syntax error"?
>
>  I just ran:  strings /bin/expr
>
>  From the output I would guess that 'match', 'index', 'substr' and 'length'
>are builin functions or operators for 'expr', although they are not documented
>in any man pages that I have seen.
>

	Well I'm blowed!  All those work although I've not seen any
documentation for any one of them. (SCO 3.2.2)

Input						Output
-----						------
expr match abcde abc				3
expr index abcde cd				3
expr length abcde				5
expr substr abcde 2 3				bcd

	Why doesn't anyone DOCUMENT unix?
		Cliff.
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