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,...
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 contain variables or sub-expressions. -z tests if a string is empty....
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...
/bin/bash##***#Author: yoob#QQ: 2291887277#Date: 2023-12-23#FileName: work_menu.sh#URL: http://www.yoob.com#Description: The test script#Copyright (C) 2023 All rights reserved#***. /etc/init.d/functionsecho-en"\E[$[RANDOM%7+31];1m"cat<<EOF 请选择: 1)备份数据库 2)清理日志...
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....
‘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 function of if-else in shell script is an important asset for shell programmers. It is the best tool to use when you need to execute a set of statements based on pre-defined conditions. The if-else block is one, if not the most essential part of conditional programming. By regulatin...
Null-conditional operators ?. and ?[] Note This feature was moved from experimental to mainstream in PowerShell 7.1. A null-conditional operator applies a member access, ?., or element access, ?[], operation to its operand only if that operand evaluates to non-null; otherwise, it returns ...
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 ...
The concept of a Bash script is to run a series of Commands to get your job done. To run multiple commands in a single step from the shell, you can type them on one line and separate them with semicolons. pwd ; whoami This is a Bash script!!