This allow us to use the shellprompt as a calculator: shell 在展开中执行算数表达式。这允许我们把 shell 提示当作计算器来使用: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [me@linuxbox ~]$ echo $((2 + 2)) 4 Arithmetic expansion uses the form: 算术表达式展开使用这种格式: 代码语言:...
Here’s an example of a script that validates user input for a simple calculator: #!/bin/bashecho"Enter the first number:"readnum1echo"Enter the second number:"readnum2if[[$num1=~^[0-9]+$]]&&[[$num2=~^[0-9]+$]];thenecho"Both numbers are valid."# Perform calculations hereels...
First you’ll use Python to solve some simple math problems. The interactive shell can work just like a calculator. Type 2 + 2 into the interactive shell at the >>> prompt and press ENTER. (On some keyboards, this key is RETURN.) Figure 1-1 shows how this math problem looks in the...
/bin/bash # as a example we have used \n as a new line, \x40 is hex value for @ # and \56 is octal value for . echo $'web: www.linuxconfig.org\nemail: web\x40linuxconfig\56org' 1. 2. 3. 4. 17. Arithmetic Operations 17.1. Bash Addition Calculator Example #!/bin/bash let...
Ch Shell is a C language shell and genuine C shell. It runs cross platform for shell programming interactivelly.
It works too! It is a Calculator! The Groovy Shell can be used for simple mathematical calculations:1 2 3 4 5 6 7 8 9 groovy:000> 40 + 2 ===> 42 groovy:000> groovy:000> 123456789123456789 * 123456789123456789123456789 ===> 15241578780673678530864199515622620750190521 groovy:000> groovy:000>...
交互式命令行程序可以用于快速测试一些语句,或进行简单的编程获取结果。 The interactive command line program can be used to quickly test some statements, or conduct simple programming to obtain results.另外,可以用-version参数查看当前谢语言的版本号: ...
The shell allows arithmetic to be performed by expansion. This allow us to use the shellprompt as a calculator: shell 在展开中执行算数表达式。这允许我们把 shell 提示当作计算器来使用: [me@linuxbox~]$echo$((2+2))4 Arithmetic expansion uses the form: ...
Although Automation Workshop is primarily intended to take care of process automation without scripting or programming, it also provides this low level layer access (to power users and system administrators) for particularly demanding automation scenarios....
It’s a simple combination of the case statements we saw in Chapter 5,and the calculator loop we saw in the previous chapter. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 # The Debugger Command Loop function _cmdloop { local cmd args while ...