find and replace character in file

Nick September 27, 2002 at 07:57:51 Pacific
Unxi, 256

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Hi, I am new to Unix and I need your help. I have the following input file: 2342314.ABO.PR.TO 9937.UIT.PR.N 36924946.CC.ER.TO 3234AQ.UR.U I need a script to replace the first dot with a comma. Thanks.

+1

ASB September 27, 2002 at 10:03:56 Pacific

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Try: sed '1,$s/\./,/' Input_file > Output_file mv Output_file Input_file

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