shell如何实现判断字符串是否存在数组中

#!/bin/sh
##数组
array=(
address
base
cart
company
store
)

 
# $1 如果存在，输出 $1 exists，$1 如果不存在，输出 $1 not exists
if [ "$1" != null ];then
 if [[ "${array[@]}" =~ "${1}" ]]; then
 echo "$1 exists"
 elif [[ ! "${array[@]}" =~ "${1}" ]]; then
 echo "$1 not exists"
 fi
else
 echo "请传入一个参数"
fi

## 判断字符串是否存在文本中
#!/bin/sh

names="This is a computer , I am playing games in the computer"
if [[ "${names[@]}" =~ "playing" ]]; then
 echo &＃39;字符串存在&＃39;
fi

#!/bin/bash
a="hello,world,nice,to,meet,you"
#要将$a分割开，先存储旧的分隔符
OLD_IFS="$IFS"

#设置分隔符
IFS="," 

#如下会自动分隔
arr=($a)

#恢复原来的分隔符
IFS="$OLD_IFS"

#遍历数组
for s in ${arr[@]}
do
echo "$s"
done