全局变量在父、子shell中起做用

yinhaibo@yinhaibo-OptiPlex-9020:~$ m='hh' yinhaibo@yinhaibo-OptiPlex-9020:~$ export m yinhaibo@yinhaibo-OptiPlex-9020:~$ echo $m hh yinhaibo@yinhaibo-OptiPlex-9020:~$ sh $ echo $m hh $ exit yinhaibo@y

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