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
（创建页面，内容为“=== 数组基本操作 === [root@router ~]# array=( > 123 > 456 > 789 > ) [root@router ~]# echo ${array[*]} 123 456 789 [root@router ~]# echo ${array[#]}…”） |
小无编辑摘要 |
||
| 第1行： | 第1行： | ||
=== 数组基本操作 === | ===数组基本操作=== | ||
[root@router ~]# array=( | [root@router ~]# array=( | ||
> 123 | > 123 | ||
| 第9行： | 第9行： | ||
123 456 789 | 123 456 789 | ||
[root@router ~]# echo ${array[ | [root@router ~]# echo ${array[@]} | ||
123 456 789 | 123 456 789 | ||
| 第16行： | 第16行： | ||
=== 判断变量是否在数组内 === | ===判断变量是否在数组内=== | ||
==== Method 1 ==== | ====Method 1==== | ||
echo "${array[@]}" | grep -wq "$var" && echo "Yes" || echo "No" | echo "${array[@]}" | grep -wq "$var" && echo "Yes" || echo "No" | ||
==== Method 2 ==== | ====Method 2==== | ||
for i in ${array[@]} | for i in ${array[@]} | ||
do | do | ||
| 第29行： | 第29行： | ||
<br /> | <br /> | ||
==== Method 3 ==== | ====Method 3==== | ||
[[ ${array[@]/${var}/} != ${array[@]} ]] && echo "Yes" || echo "No" | [[ ${array[@]/${var}/} != ${array[@]} ]] && echo "Yes" || echo "No" | ||
Question: diff ? | Question: diff ? | ||
2020年4月16日 (四) 12:47的版本
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 ??
