Linux bash--字符串拼接

#!/usr/bin/env bash

concat_strings() {
    local separator=$1  # 分隔符
    shift                # 移动参数位置
    local result=""      # 结果字符串初始化为空
 
    # 循环遍历剩余的参数，拼接字符串
    for string in "$@"; do
        result="${result}${separator}${string}"
        separator=$1  # 更新分隔符
    done
 
    # 移除字符串首部的分隔符
    result="${result#$separator}"
 
    echo "$result"  # 输出拼接后的字符串
}


result=""
for device in $(ls '/mnt' | awk '{print $1}');
do
    echo "this is third $device"
    #result="$result $(concat_strings " -d,r " /mnt/$device)"
    result="$result  -d,r /mnt/$device"
 
done
  echo "$result"