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yes this is a part of my homework but i don't know how to solve it. I think i don't need to count the field and just add to the end of the head line. I'm using linux Mint terminal.

Example i have 3 fields and i wanna add my input to the field after that (NF+1)

SID|Fname|Lname
123123:adds:asdasdasd

Result

SID|Fname|Lname|Number
123123:adds:asdasdasd:123123
...