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.\" Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
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.\" Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
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.\"
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.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
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.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
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.\"
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.TH INTCMP 1
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.SH NAME
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intcmp \(en compare integers
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.\"
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.SH SYNOPSIS
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.\"
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intcmp
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.RB ( -egl )
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.RB [ integer ]
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.RB [ integer... ]
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.SH DESCRIPTION
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Compare integers to each other.
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.SH OPTIONS
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.IP \fB-e\fP
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Permits given integers to be equal to each other.
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.IP \fB-g\fP
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Permits a given integer to be greater than the following integer.
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.IP \fB-l\fP
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Permits a given integer to be less than the following integer.
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.SH EXAMPLES
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.\"
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It may help to think of the -e, -g, and -l options as equivalent to the
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infix algebraic \(lq=\(rq, \(lq>\(rq, and \(lq<\(rq operators respectively, with
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each option putting its symbol between every given integer. The following
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example is equivalent to evaluating \(lq1 < 2 < 3\(rq:
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.RS
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.R intcmp -l 1 2 3
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.RE
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.\"
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.SH DIAGNOSTICS
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.\"
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The program will exit with a status code of 0 for a valid expression and with a
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code of 1 for an invalid expression.
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In the event of an error, a debug message will be printed and the program will
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exit with the appropriate
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.BR sysexits.h (3)
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error code.
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.\"
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.SH BUGS
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.\"
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-egl, \(lqequal to or less than or greater than\(rq, exits 0 no matter what for
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valid program usage and may be abused to function as an integer validator. Use
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.BR str (1)
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instead.
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.\"
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.SH CAVEATS
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.\"
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There are multiple ways to express compound comparisons; \(lqless than or equal
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to\(rq can be -le or -el, for example.
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The inequality comparison is -gl or -lg for \(lqless than or greater than\(rq;
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this is elegant but unintuitive.
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.\"
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.SH RATIONALE
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.\"
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The traditional tool for integer comparisons in POSIX and other Unix shells has
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been
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.BR test (1).
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This tool also handles string comparisons and file scrutiny. These parts of its
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functionality have been broken out into multiple utilities.
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This program\(cqs functionality may be performed on a POSIX-compliant system
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with
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.BR test (1p).
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.\"
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.SH AUTHOR
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.\"
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Written by DTB
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.MT trinity@trinity.moe
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.ME .
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.\"
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.SH COPYRIGHT
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.\"
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Copyright \(co 2023 DTB. License AGPLv3+: GNU AGPL version 3 or later
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<https://gnu.org/licenses/gpl.html>.
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.\"
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.SH SEE ALSO
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.BR scrut (1),
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.BR strcmp (1),
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.BR str (1),
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.BR test (1p)
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