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User Administration

%user's home directories get populated with the files from "/etc/skel/*"


1. Command:
(1)user administration

#useradd [options] username

#passwd username

#chgr groupname filename

#usermod [options] username
Options:
-L : lock the password
-U: unlock the password
-G group : append the user to the specified groups
-d home_dir : change the home directory
-e expire_date : set date which the account will expire and be disabled

#userdel [-r] username
-r : deletes the user's home directory

#chage [options] username
Options:
-m : minimum days between password changes
-M : maximum days between password changes
-E date : expier the account on this date(YYYY-MM-DD format)
-l : list the settings

(2)group administration

#groupadd groupname

#groupdel groupname

#groupmod [options] groupname
#groupmod -n newname oldname
Ex:
#groupmod -n staff employee

2. Switching Accounts

#su - [user]
#su - [user] -c command

3.Suid, Sgid, Sticky bit

#chmod u+s filename

#chmod g+s filename
#chmod g+s directory
#chmod 2770 directory

#chmod o+t /home/share
#chmod 1777 /home/share

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