
useraddpasswdsu(substitute user)/etc/passwd/etc/shadow/etc/default/useradd/etc/login.defs/etc/skelusermoduserdelpasswdchagechpasswd/etc/group/ect/gshadowgroupaddgroupmodgroupdelgpasswdnewgrpuserswhowhoamiwlognameidgroupslsloginswritewallmesgmail