set命令是 Bash 脚本的重要环节,却常常被忽视,导致脚本的安全性和可维护性出问题。本文介绍它的基本用法,让你可以更安心地使用 Bash 脚本。 set 简介 Bash 执行脚本的时候,会创建一个新的 Shell。 $ bash script.sh 1. 上面代码中, script.sh
if["$1"='node'];thenSCRIPT_FILE=forARGin"$@"doif["${ARG}"='main.js'];thenSCRIPT_FILE='main.js'breakfidoneif[ -z"$SCRIPT_FILE"];thenexec"$@""main.js"exit0;fifiexec"$@" 这是在常见 nodejs 的 docker 镜像时经常使用的一段代码: "$@"还常常与shift命令一起使用来丢弃参数 $1#!/...
在Bash中为变量赋值非常简单。基本语法是将变量名与等号(=)连接,然后在等号右边放置变量的值。需要注意的是,在变量名和等号之间不能有空格。以下是一些示例: ```bash # 为变量赋值 my_v...
和python/c等语言不同,bash默认只用空格作为元素分割符,而不用,分割 scripts arguments & system variables references Shell Script Parameters | Examples & Advantages | Rules and Regulations (educba.com) 小综合案例 递归复制目录(不使用-R选项) #!/bin/bash recursive_copy_file() { dirlist=$(ls $1) ...
variables:BASH_ENV:"~/.profile"steps:- task:Bash@3inputs:targetType:'inline'script:env 另一个选项是为 Bash 任务的一个特定实例设置BASH_ENV,有两种方法可以执行此操作: 第一种方法是使用bashEnvValue任务输入,请参阅参考示例: YAML steps:- task:Bash@3inputs:targetType:'inline'script:envbashEnvValue...
echo 'b is set but empty'; # 设置但为空 else echo 'b is not set'; # 没设置,如 c fi``` 变量中的空格 代码语言:javascript 代码运行次数:0 运行 AI代码解释 e=123# 报错,变量中间当然不能有空格 e='1 2 3';f='1 2 3';echo $e;#123echo $f;#?echo"$f";#?
I can also execute a local script on the remote host without having to copy the script over to the remote server. One way is to enter:$> ssh remote_host 'bash -s' < local_scriptAnother example is to pass environment variables locally to the remote server and terminate the session after...
We then access this with echo and set up a neat sentence. This script is reasonably messy though; read has another function that could halve the size of this script. clear read -p "Please enter your name : " name read -p "Please enter your age : " age read -p "Please enter ...
Get the terminal size in lines and columns (from a script)This is handy when writing scripts in pure bash and stty/tput can’t be called.Example Function:get_term_size() { # Usage: get_term_size # (:;:) is a micro sleep to ensure the variables are # exported immediately. shopt -...
I like to have all the variables I need to define in one place. They are found in the next few lines following the comments and before I define some functions. You don't need to use functions, but I like them because they help give the script some structure. And the functions help ...