Bash → Test Operators → Unary → -n -n STRING (conditional operator) true if the string is not empty, i.e. if its length is non-zero. This is usually only useful for strings, which con
In this example, the script checks the grade and prints the corresponding grade letter. If the grade is 90 or higher, it prints “Grade: A”. If the grade is 80 or higher, it prints “Grade: B”. If the grade is 70 or higher, it prints “Grade: C”. Otherwise, it prints “Gra...
In this example, the script checks the grade and prints the corresponding grade letter. If the grade is 90 or higher, it prints “Grade: A”. If the grade is 80 or higher, it prints “Grade: B”. If the grade is 70 or higher, it prints “Grade: C”. Otherwise, it prints “Gra...
After creating a shell script and setting its permissions, you can run it by placing the script file in one of the directories in your command path and then running the script name on the command line. You can also run ./script if the script is located in your current working directory,...
/bin/bash##***#Filename: test.sh#Version: 1.0#Date: 2024-07-23#Author: yoob#Email: chenyongq99@163.com#Website: http://www.yoob.com#Description: Thetestscript#Copyright (C) 2024 All rights reserved#***echo 'test' 本地执行shell的五种方法 bash test.sh //脚本作为参数给到bash解释器...
‘Else if’, or ‘elif’, adds more flexibility to your conditional statements. It allows you to check multiple conditions in a single ‘if’ statement. The script executes the first condition that is true and ignores the rest. Here’s an example of an ‘elif’ statement: ...
The Bourne shell’s while loop uses exit codes, like the if conditional. For example, this script does 10 iterations: Bourne shell 的 while 循环使用退出代码,就像 if 条件一样。例如,此脚本进行了 10 次迭代: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/sh FILE=/tmp/whiletest....
Conditional Statements Comparison Operators Loops While Loops Functions Best Practices Error Handling Practical Example: Backup Script Taking Your Skills Further Conclusion Understanding Shell Scripts A shell script is a text file containing a sequence of commands that the shell can execute. Think of it ...
symbolic link-f file: file exists and is a regular file-r file: file exists and is readable-w file: file exists and is writeable-x file: file exists and is executablefile1 nt file2: file1 is newer than file2(or file2 doesn't exist)More Conditional Operators&& = and|| = or!
My First Script - WoW! Preview Accepting the input from the user Start Passing Arguments Start Functions - The Basics Start "printf" statement - Part 1 Start "printf" statement - Part 2-part2 Start Escape Character & Line Continuation Character ...