harakit/docs/mm.1

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.\" Copyright (c) 2024 DTB <trinity@trinity.moe>
.\"
.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
.\"
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.TH mm 1
.SH NAME
mm \(en middleman
.\"
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.SH SYNOPSIS
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mm
.RB ( -aenu )
.RB ( -i
.RB [ input ])
.RB ( -o
.RB [ output ])
.\"
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.SH DESCRIPTION
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Catenate input files and write them to the start of each output file or stream.
.\"
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.SH OPTIONS
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.IP \fB-a\fP
Opens subsequent outputs for appending rather than updating.
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.IP \fB-e\fP
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Use the standard error as an output.
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.IP \fB-i\fP
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Opens a path as an input. Without any inputs specified mm will use the
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standard input. The standard input shall be used as an input if one or more of
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the input files is \(lq-\(rq.
.IP \fB-o\fP
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Opens a path as an output. Without any outputs specified mm will use the
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standard output. The standard output shall be used as an output if one or more
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of the output files is \(lq-\(rq.
.IP \fB-u\fP
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Ensures neither input or output will be buffered.
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.IP \fB-n\fP
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Causes SIGINT signals to be ignored.
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.\"
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.SH DIAGNOSTICS
If an output can no longer be written mm prints a diagnostic message, ceases
writing to that particular output, and if there are more outputs specified,
continues, eventually exiting unsuccessfully.
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When an error is encountered, diagnostic message is printed and the program
exits with the appropriate
.BR sysexits.h (3)
status.
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.\"
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.SH CAVEATS
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Existing files are not truncated on ouput and are instead overwritten.
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.\"
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.SH RATIONALE
The
.BR cat (1p)
and
.BR tee (1p)
programs specified in POSIX together provide similar functionality. The
separation of the two sets of functionality into separate APIs seemed
unncessary.
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.\"
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.SH COPYRIGHT
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Copyright \(co 2024 DTB. License AGPLv3+: GNU AGPL version 3 or later
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<https://gnu.org/licenses/agpl.html>.
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.\"
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.SH SEE ALSO
.BR cat (1p),
.BR dd (1),
.BR dj (1),
.BR tee (1p)