2006隨手札記

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