Linux 前后台

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前台运行程序会占用cosole，无法执行其他操作。
将前台程序调整到后台去：Ctrl+Z
查看后台运行的程序：jobs
让程序在后台运行：bg 任务编号
将后台程序调回前台：fg 任务编号
直接在后台运行程序：
例如：后台运行test.sh
./test.sh &
通过kill操作任务：
暂停任务：kill -19 %任务编号
继续任务：kill -18 %任务编号
默认（正常终止，相当于15）：kill %任务编号
强制停止：kill -9 %任务编号
 
nohup
nohop <程序> &
Example nohup tar cvfz /tmp/a.tar.gz /tmp &
这样运行结果
a. 输出到当前目录nohup.out
b. 与控制台无关 

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