An implementation of Unix dc and POSIX bc with GNU and BSD extensions. Finished, but well-maintained.
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#!/bin/sh
#
# Written by Rich Felker, originally as part of musl libc.
# Multi-licensed under MIT, 0BSD, and CC0.
#
# This is an actually-safe install command which installs the new
# file atomically in the new location, rather than overwriting
# existing files.
#
usage() {
printf "usage: %s [-D] [-l] [-m mode] src dest\n" "$0" 1>&2
exit 1
}
mkdirp=
symlink=
mode=755
while getopts Dlm: name ; do
case "$name" in
D) mkdirp=yes ;;
l) symlink=yes ;;
m) mode=$OPTARG ;;
?) usage ;;
esac
done
shift $(($OPTIND - 1))
test "$#" -eq 2 || usage
src=$1
dst=$2
tmp="$dst.tmp.$$"
case "$dst" in
*/) printf "%s: %s ends in /\n", "$0" "$dst" 1>&2 ; exit 1 ;;
esac
set -C
set -e
if test "$mkdirp" ; then
umask 022
case "$2" in
*/*) mkdir -p "${dst%/*}" ;;
esac
fi
trap 'rm -f "$tmp"' EXIT INT QUIT TERM HUP
umask 077
if test "$symlink" ; then
ln -s "$1" "$tmp"
else
cat < "$1" > "$tmp"
chmod "$mode" "$tmp"
fi
mv -f "$tmp" "$2"
test -d "$2" && {
rm -f "$2/$tmp"
printf "%s: %s is a directory\n" "$0" "$dst" 1>&2
exit 1
}
exit 0