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. ...
Captures the exit status code of the previously executed command. $? 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 stat...
$!" # 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, ...
/bin/bashshebang to the beginning of the scripts. What Are Bash Functions? A bash function is a technique for grouping reusable bits of code under one name for later use. The bash function is like a script within a script. Using functions in bash scripting comes with two benefits: 1. A...
-V, --version display the version of Wget and exit -h, --help print this help -b, --background go to background after startup -e, --execute=COMMAND execute a `.wgetrc'-style command Logging and input file: -o, --output-file=FILE log messages to FILE -a, --append-output=FILE...
$? # 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...
if [ $? -eq 0 ]; then: Checks the exit status of the previous command. If it's 0 (indicating success), print a success message. Otherwise, it prints a failure message. 9. Write a Bash script that performs a simple arithmetic operation using user input. ...
The mapfile command can be used to read entire output of ls -l into array and print the last element of the array. Use mapfile Command 1 2 3 ls -l | mapfile -t arr; echo "${arr[-1]}" OUTPUT 1 2 3 -rw-r--r-- 1 user user 0 Jul 5 09:26 TestFile.md Here: ls...
Running an exit code without any arguments, will terminate the running script and return the exit code of the last command executed before exit.When a program terminates, the shell assigns its exit code to the $? environment variable. The $? variable is how we usually test whether a script...
CMD-LOG-LINE-BEGIN 103 | 2020-01-29 21:56:35,426 | INFO | az_command_data_logger | command args: login --identity CMD-LOG-LINE-BEGIN 103 | 2020-01-29 21:56:37,604 | INFO | az_command_data_logger | exit code: 0 请记住,如果键入了错误字母,Bash 将无法正确推测出你想要键入的字母...