Usage: join [options...] [--] [patterns...] [--] [inputs...]

Options:
  -c,--copyright    Print copyright information.
  -h,--help         Print this message.
  -l,--lines NUM    Set the number of lines to be deleted at the beginning of
                    each entry to NUM.
  -v,--version      Print version information.

Patterns are defined with the following syntax:
  1. @<PATTERN>@=<file>
  2. @<PATTERN>@=<directory>
  3. @<PATTERN>@="<string>"

PATTERN must be uppercase.

With the syntax (1), all the entries @PATTERN@ in inputs will be replaced by the
content of file.

With the syntax (2), all the entries @PATTERN@ in inputs will be replaced by the
content of all the files in directory.

With the syntax (3), all the entries @PATTERN@ in inputs will be replaced by
string. As the shell will probably interpreted double quotes, the latter should
be escaped, e.g. @FOO@='"bar"'.

join Copyright (C) 2024 Mattéo Rossillol‑‑Laruelle <[email protected]>
This program comes with ABSOLUTELY NO WARRANTY; for details type `join --copyright'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `join --copyright' for details.