43 lines
811 B
Bash
43 lines
811 B
Bash
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#!/bin/bash
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function usage { printf "Usage: %s FILE\n" "$(basename "$0")" >&2; exit 1; }
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while getopts "h" opt; do
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case "${opt}" in
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*)
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usage
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;;
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esac
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done
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shift $((OPTIND-1))
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FILE="$1"
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if [ -z "${FILE}" ]; then
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usage
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exit 1
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fi
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if command -v sponge > /dev/null; then
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( echo "# promcat (sponge)" ; cat /dev/stdin ) | sponge "${FILE}"
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else
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TEMP=$(mktemp --suffix .prom)
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function finish {
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if [ -f "${TEMP}" ]; then
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rm -f "${TEMP}"
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fi
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}
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trap finish EXIT
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echo "# promcat (mktemp, mv)" > "${TEMP}"
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cat /dev/stdin >> "${TEMP}"
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if [ ! -s "${TEMP}" ] || grep -q '^[[:space:]]*$' "${TEMP}" ; then
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printf "%s is empty\n" "${TEMP}" >&2
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exit 1
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else
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mv "${TEMP}" "${FILE}"
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fi
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fi
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