is a special variable that holds the exit status of the last executed command. Stores the exit status in the variable 'exit_status'. Print the exit status code: echo "Exit status code: $exit_status" Prints the exit status code along with a descriptive message. $exit_status is the value ...
will print the exit code of the tee command. Bash exit command The exit command exits the shell with a status of N. It has the following syntax: exit N Copy If N is not given, the exit status code is that of the last executed command. ...
Copy code #!/bin/bash# 使用当前目录作为默认目录,如果用户没有提供目录参数directory="."# 检查是否有用户提供的目录参数if [ $# -gt 0 ]; thendirectory="$1"fi# 列出目录中的文件和目录,并显示长格式信息for item in "$directory"/*; doif [ -f "$item" ]; then# 如果是文件,显示文件名和文件...
$!" # 返回最近一个后台命令的进程 ID sleep 1 echo "the last parameter of the previous command: \$_ $_" # 上一个命令的最后一个参数, 比如这里是1 选项参数传递 getopts 是一个用于解析命令行选项和参数的内置命令, 语法为 getopts optstring name optstring 是一个字符串, 定义脚本可以接收的选项, ...
Exit Codes #!/bin/bash exit 0 # Exit the script successfully exit 1 # Exit the script unsuccessfully echo $? # Print the last exit code Conditional Statements Boolean Operators $foo - Is true !$foo - Is false Numeric Operators -eq - Equals -ne - Not equals -gt - Greater than -ge ...
2. Add the code below to the shell script: # syntax.sh# Declaring functions using the reserved word function# Multilinefunctionf1 {echoHello I\'m function 1 echo Bye! } # One line function f2 { echo Hello I\'mfunction2;echoBye!; }# Declaring functions without the function reserved wor...
curl --location 'https://gateway.xxx.cn/bdp/public/api/V2/data2api/xxx-digitalTwin-deviceLastetCollectTime/v1.0' \ --header 'Content-Type: application/json' \ --header 'agentCode: Baidu' \ --data '{ "params": { "deviceList": ["efc240f3232f4353"], "startTime": 1605223749685, "...
Read Me 本文是以英文版<bash cookbook> 为基础整理的笔记,力求脱水 2018.01.21 更新完【中级】。内容包括工具、函数、中断及时间处理等进阶主题。 本...
if rc.returncode == 0: print('%s已存在' % run) exit(1) # 结束程序,$? => 1 subprocess.run( # 创建用户 'useradd %s' % user, shell=True ) subprocess.run( # 添加密码 'echo %s | passwd --stdin %s' % (password, user), ...
$? # Exit status of last task $! # PID of last background task $$ # PID of shell $0 # Filename of the shell script $_ # Last argument of the previous command 检查命令返回值 if ping -c 1 google.com; then echo "It appears you have a working internet connection" fi 检查grep 的...