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31 lines
614 B
Bash
31 lines
614 B
Bash
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#/usr/bin/env bash
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set -eo pipefail
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function help() {
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echo "Usage: leap.sh <year>"
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}
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trap 'help' ERR
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if test $# -lt 1 || test $# -gt 1
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then
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help && exit 1
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fi
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year=$1
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# This is a check whether the input is a year.
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# The year is expected to be an integer and printf throws an error if the specifier does not match the input.
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# Pretty odd way but it is clever, don't you think?
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printf "%d" $year 1>/dev/null 2>/dev/null
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if test $(expr $year % 4) -eq 0
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then
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if test $(expr $year % 100) -eq 0 && test $(expr $year % 400) -ne 0
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then
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echo "false"
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exit 0
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fi
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echo "true"
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else echo "false"
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fi
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