sudo and su
时间：2014-10-27 22:59:09
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sudo bash : change the current user into root
su u1: change the current user into u1
useradd: add new user into system
userdel: delete a user from system
groups: check a user‘s group information
chown: chang a file‘s owner
chmod: chang a file‘s mod
gpasswd -a u3 foo: add user into a group
su u1 -c "./objput doc<testfile"
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