$echo${array[i]}说明:数组是从序号0开始计算(即第1项为array[0])。 (02) 显示数组中的所有元素 $echo${array[@]}或者 $echo ${array[*]} (03) 显示数组长度 $echo${#array[@]}或者 $echo ${#array[*]} (04) 删除数组第2项元素 $unset array[1]说明: unset仅仅只清除array[1]的值,并没...
它的语法与for...in循环基本一致。select name [in list] do commands doneBash 会对select依次进行下面的处理。select生成一个菜单,内容是列表list的每一项,并且每一项前面还有一个数字编号。 Bash 提示用户选择一项,输入它的编号。 用户输入以后,Bash 会将该项的内容存在变量name,该项的编号存入环境变量REPLY。
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We are going to use two elements to check if bash array is empty or not. One is${#array[@]}and other is the-zoperator. Here, the${#array[@]}is used in Bash for array expansion, allowing you to access all elements of an array.Don't confuse it with${array[*]}which treats the...
如果要使用默认值0来初始化较大的数组中每个元素,可以使用for 循环。 # 初始化一个大小为 500 的数组,默认值为0 # declare -a my_big_array=($(for i in {1..500}; do echo 0; done)) 读取和写入索引数组中的值 要在索引数组中的特定索引位置读取或写入值,使用中括号[]指定索引。
TL;DR: How Do I Loop Through an Array in Bash? You can use a'for'loop to iterate through an array in Bash, with the syntaxfor i in "${array[@]}". This is a fundamental technique in Bash scripting that allows you to process each element in an array individually. ...
for i in {1..20;do} ping -c 1 -w 1 ...&>/dev/null return done while [ $i -le 100];do let i++ done i=1 until [ $i -gt 100 ]; do #为假则进入循环 let i++ done 循环控制语句 ### continue [次数]: ##可以写次数,表示提前结束第几次循环,直接进入下一轮判断 while [] ...
“e” that has been getting the total size of this array “Arr2” using the “@” operator within its index. The “for” loop has been utilized to iterate the array and display each of its string values at the Bash shell using the “echo” statement and index “I”. Let’s save ...
For example, if I want to print the 5th element of the array, then, I will be using the following: echo "Enter whitespace-separated values:" read -a array echo "The 5th element in an array is: ${array[5]}" 2. Read into an array using a file (using a loop) ...