Unix: How to read a line from a file and output the line to a file

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How to read a line from a file and output the line to a file
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(unix.stackexchange.com/users/737261/xavierwood)XavierWood
(unix.stackexchange.com/users/22565/st%c3%a9phane-chazelas)Stéphane Chazelas
(unix.stackexchange.com/users/133219/ed-morton)Ed Morton
A special thanks goes out to the (unix.stackexchange.com/questions/794364/how-to-read-a-line-from-a-file-and-output-the-line-to-a-file)Stackexchange community

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