题解 | #shell/bash打印字母数小于8的单词#

分割字符串为单词,遍历每个单词并且获得每个单词的长度,也就是shell获取字符串长度

### 获取字符串长度的方式 ele-字符串变量
# awk 的length()函数
# awk的NF变量 echo "${ele}" | awk -F"" '{print NF}'
# wc -c 字节个数,一个英文一个字节,因此可用,但是换行符也会被算上, 中文编码方式不同结果也不同
# wc -m 字符个数
# wc -L line的长度
# ${#ele} [ele是字符串变量名]
# expr length ${ele}
awk '{for(i=1;i<=NF;i++) if(length($i)<8) print $i}' nowcoder.txt
cat nowcoder.txt | awk '{for(i=1;i<=NF;i++) if(length($i)<8) print $i}'

### 已下都用方法/函数定义
function test0() {
    for ele in `cat nowcoder.txt`; do 
        if [ ${#ele} -lt 8 ]; then
            echo ${ele}
        fi
    done
}

# tem=`cat now/coder.txt`
# arr=(${tem})
function test1() {
    for ele in ${arr[@]}; do 
        if [ ${#ele} -lt 8 ]; then
            echo ${ele}
        fi
    done
}

function test11() {
    for ele in ${arr[@]}; do
        #temp=$(echo -n "${ele}" | wc -c)
        # -n参数:去除"\n"换行符,不去除的话,默认带换行符,字符个数就肉眼看到的多一个
        temp=`echo -n "${ele}" | wc -c`
        if [ ${temp} -lt 8 ]; then
            echo ${ele}
        fi
    done
}

function test111() {
    for ele in ${arr[@]}; do
        temp=`expr length ${ele}`
        if [ ${temp} -lt 8 ]; then
            echo ${ele}
        fi
    done
}

function test1111() {
    for ele in ${arr[@]}; do
        temp=`echo "${ele}" | wc -L`
        if [ ${temp} -lt 8 ]; then
            echo ${ele}
        fi
    done
}

function test2() {
    local ele=""
    for (( i=0; i<${#arr[@]}; i++ )); do
        ele=${arr[${i}]}
        if [ ${#ele} -lt 8 ]; then
            echo ${ele}
        fi
    done
}
test0