通过使用不同的数据运行脚本来验证脚本: Example of running bash script with logical operators in if statement ️ 练习时间 让我们做一些练习吧 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是...
Example of running bash script with logical operators in if statement 🏋️ 练习时间 让我们做一些练习吧 😃 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是否存在。你可以提供完整的文件路...
Under Logical operators, Bash provides logical OR operator that performs boolean OR operation. Bash boolean OR operator takes two operands and returns true if any of the operands is true, else it returns false. OR logical operator combines two or more simple or compound conditions and forms a c...
Functions are called in your scripts or from the CLI by using their names, just as you would for any other command. In a CLI program or a script, the commands in the function are executed when called. Then the sequence of program flow returns to the calling entity, and the next series...
A1. Yes, you can combine multiple conditions using logical operators such as && (AND) and || (OR) to create compound conditions within a single if statement. Q2. Can I use the if statement to check the existence of a file or directory?
How Do I Combine Both Logical Operators? Try it as follows: cat /etc/shadow 2>/dev/null&&echo"File successfully opened."||echo"Failed to open file." Make sure only root can run this script: test$(id -u) -eq0&&echo"You are root"||echo"You are NOT root" ...
To compare strings in the shell scripting the string comparison operators=,==,!=are used. Let’s create a Bash script to take the username as input from the user and compare the name string with the hardcoded name. #!/bin/bash
Here’s a table of some of the useful logical operators in case you need to reference how they’re used later: 5.4.3If and Else Conditional expressions are powerful because you can use them to control how a Bash program that you’re writing is executed. One of the fundamental constructs ...
Used to make comments in the script. && logical AND operator. | | logical OR operator. $# Used to expands the number of arguments passed to the script. $0 Used to expands to the name of the shell. $1, $2 Used as an input parameter that you can add when running script. exit...
Logical Operators Start File Test Operators Start Downloadable Resources Start Operators - Assignment#1 Start Customizing Shell Environment 7 Lessons Overview Start Shell Prompt Customization Start Bash Shell Special Files Start Alias Command Start