可以使用read命令来实现。read命令用于从标准输入读取用户输入的值,并将其赋给一个变量。 具体用法如下: ``` read variable_name ``` 其中,variable_name是...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: check-scripts:# Fail if any of these files have w...
To convert strings to integers in bash, wrap them in $((X)). Like this: $((string)) If the string has an identifiable number, it will be treated as a number. The example I showed above can be corrected as: avimanyu@linuxhandbook:~$ sum=$((3+6)) avimanyu@linuxhandbook:~$ ech...
问使用带有变量的sed替换bash中的带引号的字符串EN在 Linux 系统中，sed 是一个非常有用的文本处理工具...
I'm preparing for an exam but I'm having difficulties with one past-paper question. Given a string containing a sentence, I want to find the longest word in that sentence and return that word and its ... WebGL: Count the number of rendered vertices ...
# Generate a random numberrandom_number=$RANDOM# Print the random numberecho"The random number is$random_number"# Output:# The random number is [Random number between 0 and 32767] Bash Copy In this code block, we first assign the value of$RANDOMto the variablerandom_number. Then, we prin...
-e script, --expression=script add the script to the commands to be executed-n, --quiet, --silent suppress automatic printing of pattern space=Print the current line number. p Print the current pattern space. cv@cv:~/myfiles$sed-n'3,5p'test.txt #example-1SYNOPSISsed[OPTION]... {scr...
Number of arguments:1 用户输入 如果你正在为自己或其他人编写Bash程序,那么获取用户输入的一种方式就是指定用户提供给程序的参数,正如我们在前一节中讨论的那样。你还可以通过使用read命令暂时停止程序的执行,要求用户在命令行上输入一个字符串。让我们写一个小脚本,你可以看到read命令是如何工作的: ...
$ sudoadd-apt-repositoryppa:navanchauhan/bash-snippets $ sudo apt update $ sudo apt install bash-snippets 用法 需要网络连接才能使用这些工具。用法很简单。让我们来看看如何使用其中的一些脚本,我假设你已经安装了所有脚本。 1、 Currency – 货币转换器 ...
Bash also interprets a number of multi-character options. These options must appear on the command line before the single-character options to be recognized. --debugger Arrange for the debugger profile to be executed before the shell starts. Turns on extended debugging mode (see the description ...