问将一个字符串映射到一个唯一的数字？

EN

awk '{if (!($0 in ids)) ids[$0] = ++i; print ids[$0]}'

jkugelman$ echo $'a\nb\nc\na\nb\nc' | awk '{if (!($0 in ids)) ids[$0] = ++i; print ids[$0]}'
1
2
3
1
2
3

declare -A stringmap
counter=0
while read string < INPUTFILE; do
    if [[ -z ${stringmap[$string]} ]]; then
        let counter+=1
        stringmap[$string]=$counter
    fi
done
for string in "${!stringmap[@]}"; do
    printf "%d -> %s\n" "${stringmap[$string]}" "$string"
done

awk 'BEGIN { num = 0; }
{
    if ($0 in seen) {
        print seen[$0];
    } else {
        seen[$0] = ++num;
        print num;
    }
}' [file]