Well, here's the answer. Normally, bash would wait for an ongoing process or command to return an exit code before it picks the next one in the sequence. However, this can be manipulated using an ampersand. The
加了&后,在后台执行command1命令,可以继续执行下一个命令。 类似的,command2 &也是在后台执行command2命令。 即,通过&在后台并发执行command1、command2命令,可以更好地利用 CPU 并发能力,加快执行速度。 如果先等待command1执行完成,再来执行command2命令,可能会比较慢。 之后执行wait命令,没有提供任何参数,会等待...
现在，在shell级别上，您不必调用wait(1)¹来获取子进程-bash会自动执行此操作。我还没有确认，但当...
If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0. Commands separated by a ; are executed sequentially; the shell waits for each command to ...
If the background process does not finish the first and second process, thewaitcommand invokes a pause to wait for the background process to complete after the second process before continuing to the third process. 2. Save the script assingle_process.sh. In the terminal,change permissionsto ...
The shell does not wait for the command to finish, and the return status is 0. Commands separated by a ; are executed sequentially; the shell waits for each command to terminate in turn. The return status is the exit status of the last command executed....
CentOS 8 查看 IP 报错:bash: ifconfig: command not found在使用 CentOS 8 系统时,有时会遇到使用 ifconfig 命令查看网络接口信息时出现 bash: ifconfig: command not found 的错误。这是因为从 CentOS 7 开始,系统默认不再安装 net-tools 包,而 ifconfig 命令正是包含在这个包中的。 IP 网络接口 CentOS ...
If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0. 于是便有了方式一,编写脚本文件 parallel.sh : ...
How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess ends with code !=0? 如何在bash脚本中等待该脚本生成的几个子进程完成并返回退出代码!=0,当任何子进程以代码结束时!= 0? 简单脚本: 1
If a command is terminated by the control operator &, the shell executes the command in the background in a sub shell. The shell does not wait for the command to finish, and the return status is 0. Commands separated by a ; are executed sequentially; the shell waits for each ...