数组

使用括号及空格来赋值数组。

#!/bin/bash
user_array=("user01" "user02" "user03")
user_array_length=`echo ${#user_array[@]}`
echo "user array length : $user_array_length" 

正则

使用=~判断正则关系。

#!/bin/bash
user_name=$1
group_name=$2
if [[ $user_name =~ ^[a-z0-9_-]{1,32}$ && $group_name =~ ^[a-z0-9_-]{1,32}$ ]]
then
    echo "user_name: $user_name, group_name: $group_name valid!"
else
    echo "user_name: $user_name, group_name: $group_name invalid!"
    exit 1
fi

包含关系

构建一个包含判断的方法进行使用。

#!/bin/bash
user_name=$1

user_array=("user01" "user02" "user03")
user_array_length=`echo ${#user_array[@]}`
echo "user array length : $user_array_length" 

# 判断包含关系
function contains() {
    local n=$#
    local value=${!n}
    for ((i=1;i < $#; i++)) {
        if [ "${!i}" == "${value}" ]; then
            echo "y"
            retrun 0
        fi
    }
    echo "n"
    return 1
}

# judge
if [ $(contains "${user_array[@]" "$user_name") == "y" ];
then
    echo "user_name: $user_name may be contains in array, please check it!"
    exit 1
fi