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underscore to dots

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linux-howto

http://www.unix.com – Hi, I have been trying to change underscores to dots. For example: 1122_91 1022_233 . 2237_23 9382_2339 2998_234 345_257 . . Desired output: 1122.91 1022.233 . 2237.23 9382.2339 2998.234 345.257 . . Any idea? Thanks (HowTos)