When executing a command in the terminal, you need to wait until the command finishes its execution. This is called the foreground process.However, some advanced programs need to be run in the background. In a Bash script, there is an easy way to make your command run in the background...
41. & 与 与号(Run job in background[ampersand])。 如果命令后面跟上一个&符号,这个命令将会在后台运行。 有的时候,脚本中在一条在后台运行的命令可能会引起脚本挂起,等待输入,出现这种情况可以在原有的脚本后面使用wait命令来修复。 42. &&,|| 逻辑操作符 逻辑操作符(logical operator)。 在测试结构中,...
& 与号(Run job in background[ampersand])。 如果命令后面跟上一个&符号,这个命令将会在后台运行。有的时候,脚本中在一条在后台运行的命令可能会引起脚本挂起,等待输入,出现这种情况可以在原有的脚本后面使用wait命令来修复。 && || 逻辑操作符(logical operator)。 在测试结构中,可以用这两个操作符来进行连接...
The wait command can also be used with timeout command to limit amount of time we wait for a process to complete. For example, suppose we have a script that starts a long-running process in background, and we want to wait for it to complete, but we also want to limit amount of ...
runskill -9 $waiter 2>/dev/null# 0 if we killed the waiter, cause that means the process ...
Unlike the previous commands, usingnohupallows you to run a command in the background and keep it running. How?nohupbypasses the HUP signal (signal hang up), making it possible to run commands in the background even when the terminal is off. Combine this command with redirection to “/dev...
Because of the way that a foreground process interacts with its terminal, there can be only a single foreground process for every terminal window. Because background processes return control to the shell immediately without waiting for the process to complete, many background proces...
Attaching an ampersand (&) will cause bash to run the command in the background, and bash can return so you would start another process. Can the WAIT command help? If you know much about bash commands, you may have thought of using the WAIT command to control how bash executes your com...
I wrote a simple bash script calling a function that loops 5 times and call echo with a simple message. The function is called, the output redirected in a file and the process background then in my workspace I created a task that calls this script ...
In Bash you can start new processes (theads) on the background simply by running a command with ampersand &. The wait command can be used to wait until all background processes have finished (to wait for a certain process do wait PID where PID is a process ID). So here’s a simple...