bash 和 sh的区别
[root@10-9-50-240 scripts]# which bash /usr/bin/bash [root@10-9-50-240 scripts]# which sh /usr/bin/sh [root@10-9-50-240 scripts]# ll /usr/bin/sh lrwxrwxrwx 1 root root 4 Aug 14 2018 /usr/bin/sh -> bash
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