Check if element is present in the array Sometimes before doing any processing with the particular element, you may wish to check if the element is already present in the array. There are many ways to do this but below is the simplest way. I am using the conditional statement with the-n...
Check if a Key Exists A simple way to check if an element exists in an array is to use a conditionalifstatement. For example: if [[ -n "${example_array["key1"]}" ]] then echo "True" else echo "False" fi The-ntag checks if the array returns a non-zero element when searching ...
#!/bin/bash # 定义两个数组 array1=("apple" "banana" "cherry") array2=("red" "yellow" "green") # 循环遍历第一个数组 for item1 in "${array1[@]}" do # 循环遍历第二个数组 for item2 in "${array2[@]}" do # 组合元素并输出 echo "$item1 $item2" done done 上述代码中,...
for element in "${array@}" do 代码语言:txt 复制 if [[ "$element" == "banana" ]]; then 代码语言:txt 复制 echo "找到了元素 banana" 代码语言:txt 复制 fi done 代码语言:txt 复制 使用数组索引进行比较:# 定义数组 array=("apple" "banana" "cherry" "date") 比较数组元素 if [[ "${arr...
for i in "${my_array[@]}" do #check if the element matches the search value if [ "$i" == "$search_value" ] then echo "Array contains $search_value" exit 0 fi done echo "Array does not contain $search_value" exit 1 Output 1 2 3 Array contains banana First, we defined ...
# get number of elements in the array ELEMENTS=${#ARRAY[@]} # echo each element in array # for loop for (( i=0;i<$ELEMENTS;i++)); do echo ${ARRAY[${i}]} done 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 8.2. Read file into bash array ...
I can embed the if-condition in the loop itself, but that would only be useful to check if a value is present, not if a value is absent. That is why I use the flag variable. I do this first, by looping over every element of the array. Then, by using the==operator to check if...
新版本的Bash支持一维数组。 数组元素可以使用符号variable[xx]来初始化。另外,脚本可以使用declare -a variable语句来制定一个数组。 如果想引用一个数组元素(也就是取值),可以使用大括号,访问形式为 ${element[xx]} 。 例子27-1. 简单的数组使用 #!/bin/bash ...
$ array=(red green blue yellow brown) $ random_array_element "${array[@]}" yellow # Multiple arguments can also be passed. $ random_array_element 1 2 3 4 5 6 7 3 1. 2. 3. 4. 5. 6. 7. 循环一个数组 每次printf调用时,都会打印下一个数组元素。当 ...
if [[ $var != *sub_string* ]]; then printf '%s\n' "sub_string is not in var." fi # 也可以在数组中运行 if [[ ${arr[*]} == *sub_string* ]]; then printf '%s\n' "sub_string is in array." fi使用case语句:case "$var" in *sub_string*) # Do stuff ;; *sub_string2...