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Linux常用命令-112：bg
source link: https://xugaoxiang.com/2022/10/11/linux-cmds-112-bg/
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bg 命令用于将任务放到后台运行，这样前台可以执行其他任务了。它的运行效果和在命令后面添加符号 & 的效果是一样的。
语法格式：bg [参数]
常用参数：
# 将任务号为1的任务移到后台运行
bg 1
# 使用 & 将任务放后台运行
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