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sed 's/\t/,/g'implies a) the input is tab delimited (but it's not) and b) the output is to be comma delimited (but it's not); please update the question to insure the description, sample data sets and sample code match/are typically not allowed in most OS's; since your sample code appears to be replacing/with_(in the output file names), it would appear the question needs further editing to insure sample output filenames are valid and match the output filenames from sample sample code