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Thanks Don...In my sample file it 51 character and in my original data it 103 character.
Bottom line, it has to be changed from P to T or from T to P. Also as I said file size in Giga bytes. could...

It does not work. I mean it does not change the character as requried

ISA*00* *00* *08*92 *08*123*030627*1304*U*00*00*0*P*>~ has nothing valid to change

Thanks for your quick reply.. I will test and get back..

The total length of first file is 106 bytes. This indicator comes in 103 position. The script can be interactive such as

Enter the folder:
Enter the file name:
Change from T to P: Y/N
Change...

Yes you understanding is correct. I just need to change one character in file which comes in ISA 15 segment. Segment delimter is "*".
I have back up of file so no worries

Hi Guys,
I have a hugefile. I have requirement to change Indicator from "T" to "P" or from "P" to "T" which comes in header itself. I could not open either in any of editors or in UNIX command line...