If you installed the Oracle EBS R122 application under the UNIX user applmgr. Logon to the applmgr account.
Application base for example: /d01/oracle/VIS
Database base for example: /d01/oracle/VIS
Apps OS User: applmgr
Database OS User: oracle
Key Scripts:
# sets application tops (e.g. $INST_TOP)
/d01/oracle/VIS/fs1/EBSapps/appl/VIS_oel66-79.env
# install top
export INST_TOP=/d01/oracle/VIS/fs1/inst/apps/VIS_oel66-79
# start and stop scripts are in the following directory
$INST_TOP/admin/scripts
/d01/oracle/VIS/fs1/inst/apps/VIS_oel66-79/admin/scripts
# like (there are many others in this dir):
adstrtal.sh
adstpall.sh
# database home
# yes need the SID too
export ORACLE_SID=VIS
export ORACLE_HOME=/d01/oracle/VIS/12.1.0
export PATH=$ORACLE_HOME/bin:$PATH