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八（2）管道符和作业控制、shell变量、环境变量配置文件-handsome灿的博客
source link: http://blog.51cto.com/13589255/2084418
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管道符、作业控制管道符 | ：把前面命令的的输出交给后面命令的输入暂停任务：ctrl+ z （临时暂停，仍到后台 ，调回前台 fg）jobs 可以把暂停的任务列出来。fg +id号就能把相应暂停任务调回前台。 fg 2bg 把任务放到后台sleep 1000 暂停1000秒sleep 100 & 加上&可以把运行任务如直接放到后台执行 shell变
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