echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "test.sh". Parameter #1 is 1 Parameter #2 is 2 --- All the command-line parameters are: 1 ...
• EXIT:编号0,这不是系统信号,而是 Bash 脚本特有的信号,不管什么情况,只要退出脚本就会产生。 注意,trap命令必须放在脚本的开头。否则,它上方的任何命令导致脚本退出,都不会被它捕获。 如果trap需要触发多条命令,可以封装一个 Bash 函数。 function egress { command1 command3 } trap egress EXIT session 登录...
When bash is invoked as an interactive login shell, or as a non-interactive shell with the –login option, it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile, in...
# 假设在终端输入 bash bash_tutorial.sh -a 1 -b 2 -c yes a=0; b=0; c="zero" # 变量初始化, 一行定义多个变量, 通过 ';' 分割开 # 定义函数提示正确用法 usage() { echo "Usage: bash $0 -a <a_meaning> -b <b_meaning> [-c <c_meaning>]" # '[ ]' 表示参数可选 exit 1 }...
According to the above table, exit codes1 - 2, 126 - 165, and 255[1]have special meanings, and should therefore be avoided for user-specified exit parameters. Ending a script withexit 127would certainly cause confusion when troubleshooting (is the error code a"command not found" or a user...
echo"Unknown option $1"exit1;;*)#对于所有其他非选项参数(即位置参数),将它们逐一添加到POSITIONAL_ARGS数组中,POSITIONAL_ARGS+=("$1")# 保存位置参数 shift;;esac done set--"${POSITIONAL_ARGS[@]}"# 将数组里的参数设置为当前 shell 的位置参数 ...
The most basic way or single command to check if a file exists is the test command.test -f filenameIf the file exits, the above command will exit with status code 0 and if it doesn't than the status code will be 1.A simple example use case would be:...
+ echo -e 'welcome to linux shell script.\a \n' welcome to linux shell script. + exit 0 自定义脚本的状态结果: exit [n] 注意:脚本中任何位置执行了exit命令即会终止当前shell进程 //自定义状态返回值为1 //执行程序后查看 ,为1说明是正确的。
exit kill 1. Overview A good Bash script usually performs some checking before executing the commands it contains. For example, a script that executes administrative commands should check if the script is called by the root user or withsudoaccess. If a less-privileged user calls the script, it...
Bash Script Returns with Different Return Codes on Exit Before moving out to the methods, let’s take a look at the exit codes that have specific meanings: How to Get Return Codes on Exit? You only need to write the “echo $?” command to get the return code. For example, you want...