记录几个问题:
一边看电子版,一边上机操作.
第八章用户和组管理中
#pwck
bash:pwck:commandnotfound
#grpck
bash:grpck:commandnotfound
#useradd-D
bash:useradd:commandnotfound
#usermodnewnameoldname
bash:usermod:commandnotfound
#userdel等
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