If you want to know about a bash status of last command, read this article. Here you will also find out how to get the exit code of a command and how to use it.
exit_status=$? 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" Prin...
$? # 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...
Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for ...
exit命令用于退出当前shell,在shell脚本中可以终止当前脚本执行。 常用参数 格式:exit n 退出。设置退出码为n。(Cause the shell to exit with a status of n.) 格式:exit 退出。退出码不变,即为最后一个命令的退出码。(If n is omitted, the exit status is that of the last command executed. ) ...
After the shell function execution, $? returns the exit status of the last command executed in a function. After the shell script execution, $? returns the exit status of the last command executed in the script. Sample Shell Script that Explains Shell-Command Exit Status ...
Read and execute commands from filename in the current shell environment and return the exit status of the last command executed from filename.The return status is the status of the last command exited within the script (0 if no commands are executed), and false if filename is not found ...
exit is a builtin command and cause the shell to exit with a given exit status. n is the exit status of n. If n is omitted,the exit status is that of the last command executed. A function can be called on a EXIT before the shell terminates.
The exit status of the wait command is printed. $? is an internal Bash variable that holds the exit status of the last command executed. If you run the script, it will print something like this: PID:36353Exit status:0 Here’s an example using the -n option: ...
CommandDescription factor Display prime factors of specified integer numbers. false Do nothing, unsuccessfully. Exit with a status code indicating failure. fc Used to list, edit or re-execute the commands previously entered into an interactive shell. fc-cache Make font information cache after ...