When trying to understand the working of a function like if-else in a shell script, it is good to start things simple. Here, we initialize two variables a and b, then use the if-else function to check if the two variables are equal. The bash script should look as follows for this t...
if else条件的创建新变量在数据处理和数据分析中非常常见,以下是一些应用场景示例: 根据某个数值变量的取值范围,创建一个二元变量(如高/低、正/负等)。 根据某个逻辑条件,将数据分组为几个类别,并用新变量表示类别。 根据多个条件的组合,创建一个多元变量(如根据性别和年龄段,创建一个人口统计学变量)。
if condition then # 执行的命令或代码块 elif another_condition then # 另一个条件满足时执行的命令或代码块 else # 所有条件都不满足时执行的命令或代码块 fi 优势 自动化决策:允许脚本根据不同的条件自动执行不同的操作。 简化复杂任务:通过条件判断,可以将复杂的逻辑分解为简单的步骤。 提高脚本灵活性:适应...
2. How do I write an if statement in a shell script? Writing an if statement in a shell script involves specifying a condition and the actions to take if the condition is true. Here’s the basic syntax: if[condition];then# code to execute if condition is trueelse# code to execute if...
shell script 1.shell script基础 1.1.脚本文件格式: 第一行,顶格:#!/bin/bash 代码注释:# 缩进,适度添加空白行; 脚本的状态返回值: (1)默认是脚本中执行的最后一条命令的状态返回值; (2)自定义退出状态码:exit[n](n为自己指定的状态码); 注意:shell进程遇到exit时,即会终止,因此,整个脚本执行即为...
TypeScript - Ifelse StatementPrevious Quiz Next In TypeScript, the if...else statement controls the program's execution flow based on the different conditions. If the condition evaluates to true, the if block of code is executed.An if can be followed by an optional else block. The else ...
# This script prints a message about your weight if you give it your # weight in kilos and hight in centimeters. if [ ! $# == 2 ]; then echo "Usage: $0 weight_in_kilos length_in_centimeters" exit fi weight="$1" height="$2" ...
else echo "You should eat a bit more fruit." fi # weight.sh 70 150 You should eat a bit more fruit. # weight.sh 70 150 33 Usage: ./weight.sh weight_in_kilos length_in_centimeters 位置参数 {GetProperty(Content)}, $2,..., $N,$#代表了命令行的参数数量, {GetProperty(Content)}代表...
unix bash在if-statement中使用STDIN字符串 这是因为在linux上，/dev/fd/0（或/proc/self/fd/0或/...
Here, based on the result ofTEST_COMMAND, the script either executes theTHEN_EXPRESSIONSorELSE_EXPRESSIONS. Obviously, there’s a lot of spacing in the above scripts, much of which may not be needed. Let’s see how we can use that to our advantage. ...