目前我使用：
#!/bin/bash
while read line
do
((histogram[${#line}]++))
done < "${1:-/dev/stdin}"
for length in "${!histogram[@]}"; do
printf "%-1s %s\n" "${length}" "${histogram[$length]}"
done
你的意思是你想要为每个非发生长度打印一个零,直到最大长度？如果是这样：
$cat test.sh
#!/bin/bash
while read line
do
((histogram[${#line}]++))
done < "${1:-/dev/stdin}"
max=0
for length in "${!histogram[@]}"
do
if [ $length -gt $max ]
then
max=$length
fi
done
for length in $(seq 0 $max)
do
printf "%-1s %s\n" "${length}" "${histogram[$length]-0}"
done
示例运行：
$printf 'x\nfoo\n' | ./test.sh 0 0 1 1 2 0 3 1
