$LOGNAME is a shell variable and is setup to the current OS user login

$ORACLE_SID is the SID for the Oracle instance. You have to setup this manually

$PWD is shell variable and shows the current path you are into. You can use it in the .profile file as PS1='<${LOGNAME}@${HOSTNAME}>${PWD} $ '



Hope that helps,

clio_usa - OCP 8/8i/9i DBA