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|
#!/bin/sh
[ "$#" = 1 ] || {
printf "usage: %s inputfile\n" "$0" >&2
exit 1
}
update () {
if [ "$cur" -gt "$max1" ]; then
max3=$max2
max2=$max1
max1="$cur"
elif [ "$cur" -gt "$max2" ]; then
max3=$max2
max2="$cur"
elif [ "$cur" -gt "$max3" ]; then
max3="$cur"
fi
}
max1=0
max2=0
max3=0
cur=0
while read -r line; do
case "$line" in '')
update
cur=0
;;
[0-9]*)
printf "%d\n" "$line" >/dev/null 2>&1 || {
printf "%s is not a number\n" "$line" >&2
exit 1
}
cur=$((cur + line))
;;
*)
printf "%s is not a number\n" "$line" >&2
exit 1
;;
esac
done < "$1"
update
printf "%d\n" "$((max1 + max2 + max3))"
|
