Linux ????????????

#!/bin/bash #add-some-users.sh #The script is add some users to a new group. echo "Welcome to the add some users!" echo -n "Please input the new group(example : mygroup) : " read  my_new_group groupadd $my_new_group echo -n "Add the $my_new_group group is successful!" echo "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&" echo "Then add some users to the $my_new_group group!" echo -n "Please input the username(example: student) : " read new_user echo -n "Please input the username(begin_id)(example: 1 ) : " read begin_id echo -n "Please input the username(end_id)(example: 10 ) : " read end_id echo "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&" for ((i=$begin_id;i<=$end_id;i++)) do #add the new_user to the my_new_group??and no add new_user's group useradd -n -g $my_new_group $new_user$i #delete the new_user password passwd -d $new_user$i chage -d 0 $new_user$i     // done echo "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&"

????5.2 ???????su ?root
????groupadd sugroup
????chmod 4550 /bin/su
????chgrp sugroup /bin.su
????ls -l /bin/su
?????趨?????sugroup???????????????su?л?root
????sueradd bob
????passwd bob
????usermod -G sugroup bob
????5.3 ??sudo ???su
????sudo ????????? /etc/sudoers
????(?????)?????????????
????visudo
?????????????????????????????(??????)=????·????
???????磺
????????????bob 192.186.9.3=/usr/sbin/useradd??/usr/sbin/userdel
???????????  %webadmin host1=/bin/vim /etc/httpd/conf/httpd.conf