if-statement-bash-scripting-example Nested if Statement If 语句和 else 语句可以嵌套在 bash 脚本中。关键字 fi 显示了内部 if 语句的结束,所有 if 语句都应该以关键字 fi 结束。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else if [ condition_command2 ] then c...
在 Shell 脚本中，if 语句后面加不加分号都是可以的。分号在 Shell 中是一种命令分隔符，它用于分隔...
6. What is the alternative to if-else statements in shell scripting? An alternative to if-else statements in shell scripting is the case statement. The case statement allows you to match a value against multiple patterns and execute different blocks of code based on the match. Here’s an ex...
If you’re interested in learning more aboutshell scripting, check out these tutorials: An Introduction to Shell Scripting. How To Write a Simple Shell Script on a VPS. How To Execute a Command in a Shell Script. About the author(s) ...
Bash Scripting and Conditional Statements To fully grasp the power of ‘else if’ in bash scripting, it’s essential to understand the fundamentals of bash scripting, conditional statements, and flow control. What is Bash Scripting? Bash (Bourne Again SHell) is a command-line interpreter, or s...
In our next article, we’ll discuss about how to useBash conditional expressionswith practical examples. Recommended Reading Bash 101 Hacks, by Ramesh Natarajan. I spend most of my time on Linux environment. So, naturally I’m a huge fan of Bash command line and shell scripting. 15 years ...
Bash supports if-else statements so that you can use logical reasoning in your shell scripts. The generic if-else syntax is like this: if [ expression ]; then ## execute this block if condition is true else go to next elif [ expression ]; then ...
[-a: command not found 3. 其次, bash中有一个builtin的 [命令, 通常你使用[执行的都是这个内置的命令, 目的是效率. 启动一个进程的代价太高. 试试 type [ 命令 top Linux 技巧:Bash的测试和比较函数(探密test,[,[[,((和if-then-else)
histappend当shell退出时，历史清单将添加到以HISTFILE变量的值命名的文件中，而不是覆盖文件 histreedit...
Afterdeclaring a string variable, use the-zoperator in anif statementto check whether a string is empty or not: MY_STRING="" if [ -z $MYSTRING ] then echo "String is empty" else echo "String is not empty" fi For more Shell scripting tips,check out or Bash/Shell scripting articles!