(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success...
slave_status[2]="CMD_CONN_SLAVE -e 'show slave status\G' | egrep Last_Errno | cut -d: -f2" email_to_admin() { mailsubject="Syncing failed." mailbody="`date '+%F %H:%M:%S'`: Syncing of master-slave is failed,please check and repair." echo $mailbody | mail -s "$mailsubjec...
By default, a function returns the exit code from the last executed command inside the function. It will stop the function execution once it is called. You can use the return builtin command to return an arbitrary number instead. Syntax: return [n] where n is a number. If n is not ...
AI代码解释 intmain(argc,argv,env)int argc;char**argv,**env;{...shell_initialize();...run_startup_files();...shell_initialized=1;/* Read commands until exit condition. */reader_loop();exit_shell(last_command_exit_value);} 函数定义了shell启动和运行过程中的一些状态变量,依据不同的参数...
Extracting the elusive exit code To display the exit code for the last command you ran on the command line, use the following command: $echo$? The displayed response contains no pomp or circumstance. It's simply a number. You might also receive a shell error message from Bash further descr...
In this article, we will see how to get last line of output in Bash using tail, awk, sed, mapfile, and head commands with various options. 2. Introduction to Problem Statement We will use ls -l to list directories and files in long format and get the last line of output using vario...
hmac_code = hmac.new(secret_enc, string_to_sign_enc, digestmod=hashlib.sha256).digest() sign = urllib.parse.quote_plus(base64.b64encode(hmac_code)) return timestamp, sign # 获取加签后的链接 def get_signed_url(): timestamp, sign = get_timestamp_sign() ...
get的使用方法详解 Linux RPM包 安装 查询 卸载命令小结 Http和Socket之长连接和短连接区别 宝塔挂载新硬盘后修改网站根目录的方法 忘记Linux 3.X/4.x/5.x 宝塔面板密码、找回密码 docker启动时提示 Process: 3706 ExecStart=/usr/bin/dockerd (code=exited, status=1/FAILURE)解决办法 MySQL重启提示MySQL ...
$? # Exit status of last task $! # PID of last background task $$ # PID of shell $0 # Filename of the shell script $_ # Last argument of the previous command 检查命令返回值 if ping -c 1 google.com; then echo "It appears you have a working internet connection" fi 检查grep 的...
#!/usr/bin/env bash # 使用正午时间,是为了避免如果脚本在午夜运行,多几秒就会使得多算一天的错误 START_DATE=$(date -d 'last week Monday 12:00:00' '+%Y-%m-%d') while [ 1 ]; do printf "%b" "开始日期:$START_DATE, 是否正确? (Y/新日期) " read answer # ENTER, "Y" or "y"...