The background program remains running after shell exits.

After the shell exits, the background program remains running on the liunx. if you want a process to run in the background, the most direct method is to use the & amp; symbol. for example, pingwww.baidu.com & amp; but in this way, the process becomes a job of the current shell. when the shell exits, the job will receive a signal, along... after the shell exits, the background program remains running on the liunx. if you want a process to run in the background, the most direct method is to use the & symbol. for example, ping www.baidu.com. to solve this problem, you can use the nohup command to allow the job to ignore the shell exit signal, or use other methods. since the background command as a shell sub-process will be killed when the shell exits, as long as the background command is not allowed as a shell sub-process. A simple method is to use subshell to call background commands. for example Art. sh #! /Bin/bash ping www.baidu.com & then call start in shell. sh .. /start. sh I guess although start. sh is the parent process of the ping command, but start. sh stops after running. the ping command becomes an orphan process and will be adopted by the init process. therefore, exiting shell does not interrupt the ping command.