Bash判断变量值是否在数组内的随记：修订间差异
来自三线的随记
小无编辑摘要 |
小无编辑摘要 |
||
| 第12行： | 第12行： | ||
123 456 789 | 123 456 789 | ||
[root@router ~]# echo ${#array} | [root@router ~]# echo ${#array[@]} | ||
3 | 3 | ||
2020年4月25日 (六) 16:22的最新版本
数组基本操作
[root@router ~]# array=(
> 123
> 456
> 789
> )
[root@router ~]# echo ${array[*]}
123 456 789
[root@router ~]# echo ${array[@]}
123 456 789
[root@router ~]# echo ${#array[@]}
3
判断变量是否在数组内
Method 1
echo "${array[@]}" | grep -wq "$var" && echo "Yes" || echo "No"
Method 2
for i in ${array[@]}
do
[ "$i" == "$var" ] && echo "yes"
done
Method 3
[[ ${array[@]/${var}/} != ${array[@]} ]] && echo "Yes" || echo "No"
Question: diff ?
[[ ${array[@]/${var}} != ${array[@]} ]] && echo "Yes" || echo "No"
What is the principle ??
