Documented in Volume 1 of the UNIX Programmers Manual.
% fmt infile > outfile
will read infile and write it to outfile, making lines of outfile as close
to 72 characters wide as possible; it does not break words or adjust text.
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within visual mode of the ex editor (e.g. vi) the command
!}fmt
will reformat a paragraph breaking long lines to fit into 72 columns.
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