place , character afte 3 digits from left to right in a string

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http://www.unix.com – Hi All, Could anyone please help me, how to put ‘,’ character after 3 digits from right to left count,among 17 digits sting. unix scripting Example – I am having 12345678911234567 digits Accepted result-- 12,345,678,911,234,567 Note- 12345678911234567 digits will be dynamic at run time, I don’t know how many digit will generate may be less or more . please help me Thanks, Krupa (HowTos)