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I only want ABC from char pos 1-3 because it could be elsewhere in the file and elsewhere it should be ignored.

sample input file 1:
ABC9875193458739457 LKSDJSG 983475394578 LSKJFG
QZS0987983758934584 OIOISDJ 023984234244 IOEUYR
QZS0987591485794788 OIOISDJ 023984234244 IOEUYR

sample input file 2:...

I need to copy lines to a new file from files with sed using a pattern in char postions 1-3.

Then after the copy, I need to delete those same lines from the input files.

For example, string...