Question: Implementation of tac command in C language (Ubuntu). Code of any of these options. tac -b concat.txt tacexample.txt ( This option attach the separator before

Implementation of tac command in C language (Ubuntu). Code of any of these options.

tac -b concat.txt tacexample.txt ( This option attach the separator before instead of after.)
tac -r concat.txt tacexample.txt (This option will interpret the separator as a regular expression.)
tac -s concat.txt tacexample.txt (This option use STRING as the separator instead of newline)

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