Here, the Bash script above initializes an arrayarrwithdeclare -a arr. Then it uses the commandread -a arrto prompt the users to input whitespace-separated elements. After that, upon hitting theENTERbutton, it
In this approach, we’ll manually swap array elements in place so that we’re not required to create an additional array: #!/bin/bash # Initialize the original array numbers_array=(1 2 3 4) # Reverse the array in place length=${#numbers_array[@]} for (( i=0, j=length-1; i<...
In this example, we initialize a counterindexat 0. The ‘while’ loop runs as long asindexis less than the length of thefruitsarray (obtained using${#fruits[@]}). Inside the loop, we print out the current fruit, and then increment theindexby 1. Looping with ‘Until’ Loops An ‘until...
字符串长度 (变量$var得字符个数) 。 对于 array 来说, ${#array} 表示的是数组中第一个元素的长度。 例外情况: ${#*} 和 ${#@} 表示位置参数的个数。 对于数组来说, ${#array[*]} 和 ${#array[@]} 表示数组中元素的个数。 匹配字符串开头的子串长度 语法: expr match "$string" '$substrin...
You can use the following 5 methods to print an array in Bash: To print the entire array: ${your_array[@ or *]} To print the array index, value, and type: declare -p <your_array> To print the array iteratively: for item in ${your_array[@]} do echo $item done To print the...
#!/bin/bash # Prompt the user to input a number echo "Input a number:" read n # Initialize variables factorial=1 ctr=1 # Check if the input is a non-negative integer if ! [[ "$n" =~ ^[0-9]+$ ]]; then echo "Error: Input a non-negative integer." exit 1 fi # Calculate...
<<< "$current_date" IFS=':' read -r -a time_array <<< "$current_time" # 数字时钟的显示格式 # 例如:2022-01-01 # 12:34:56 echo " ${date_array[0]}${date_array[1]}${date_array[2]}" echo " ${time_array[0]}:${time_array[1]}:${time_array[2]}" sleep 1 # 暂停...
0正在被执行命令的名字。对于shell脚本而言,这是被激活命令的路径n 该变量与脚本被激活时所带的参数相对应。n是正整数,与参数位置相对应(1,2…) # 提供脚本的参数号* 所有这些参数都被双引号引住。若一个脚本接收两个参数,∗等于12@ 所有这些参数都分别被双引号引住。若一个脚本接收到两个参数,@等价于12...
PL/SQL initialization error could not initialize 我在电脑上安装了Oracle11 64位的,使用CMD可以完美连接数据库并进行SQL操作,之后用PL/SQL登录却遇到如图问题。 出现这一问题的原因:安装完后Oracle的 oci.dll 是64位的,而32位应用程序 PLSQL Developer 无法加载。 解决方案:在网上查找解决方案,百度博客... ...
# a useful idiom: DEFAULT_VAL can be overwritten# with an environment variable of the same namereadonlyDEFAULT_VAL=${DEFAULT_VAL:-7}myfunc() {# initialize a local variable with the global defaultlocal some_var=${DEFAULT_VAL}...}