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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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.TH intcmp 1
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.SH NAME
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intcmp \(en compare integers
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.SH SYNOPSIS
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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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Intcmp compares integers.
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.SH USAGE
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.B -e
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.RS
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Permits given integers to be equal to each other. If combined with
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.B -g
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or
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.B -l
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, only adjacent integers in the argument sequence can be equal.
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.RE
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.B -g
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.RS
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Permits a given integer to be greater than the following integer.
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.RE
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.B -l
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.RS
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Permits a given integer to be less than the following integer.
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.RE
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.SH EXAMPLES
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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 “=”, “>”, and “<” operators respectively, with each option
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putting its symbol between every given integer. The following example is
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equivalent to evaluating “1 < 2 < 3”:
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.RS
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.R intcmp -l 1 2 3
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.RE
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.SH DIAGNOSTICS
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Intcmp exits 0 for a valid expression and 1 for an invalid expression.
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Intcmp prints a debug message and exits with the appropriate sysexits.h(3) error
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code in the event of an error.
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.SH BUGS
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There are multiple ways to express compound comparisons; “less than or equal
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to” can be -le or -el, for example.
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The inequality comparison is -gl or -lg for “less than or greater than”; this
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is elegant but unintuitive.
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-egl, “equal to or less than or greater than”, exits 0 no matter what for valid
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program usage and may be abused to function as an integer validator.
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Use str(1) instead.
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.SH RATIONALE
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The traditional tool for integer comparisons in POSIX and other Unix shells has
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been test(1). This tool also handles string comparisons and file scrutiny.
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These parts of its functionality have been broken out into multiple utilities.
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Strcmp’s functionality may be performed on a POSIX-compliant system with
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test(1p).
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.SH AUTHOR
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Written by DTB <trinity@trinity.moe>.
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.SH COPYRIGHT
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Copyright © 2023 DTB. License AGPLv3+: GNU AGPL version 3 or later
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<https://gnu.org/licenses/gpl.html>.
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.SH SEE ALSO
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strcmp(1), scrut(1), str(1), test(1p)
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