>useradd -d /home/fred fred >system-config-users >id <username> = to list the id number for the user/group >passwd >whoami > sh <root_username> > linux file system structure = 2 b added > ls -la = diferent color means diferent things = 2 be added. > how to mount cdrom or flash drive = 2 b added > locate <program_name> > find / -name <file_to_look_for>..find / -name ls &...runs in the background using the & after the cmd intervention > less <file_to_see_the_content_of>; ls /dev | less > echo $PATH > which ls = u can c where ls commands are being run from > ps aux | less or top > bg or fg = to start the program in the background or foreground > jobs = to list all process running in the background > gedit /etc/sysconfig/network-scripts/ifcfg-eth0 > service network restart > netstat -nap | less = show listeining ports; > /usr/sbin/lsof -i | less = list of open files, c