PIA domain installed with old method now nee dto make use of psadmin utility to start and stop webserver :-

Make change in .bash_profile 

it should be like below :-

if [ -f /oracle/psoft_scripts/eigenpshrenv ]

 then

        . /oracle/psoft_scripts/eigenpshrenv

fi

export ORACLE_HOME=/oracle/middleware/Oracle_WT1

export ORACLE_INSTANCE=/oracle/middleware/Oracle_WT1/instances/instance1

export COMPONENT_TYPE=OHS

export COMPONENT_NAME=ohs1

export PATH=$ORACLE_INSTANCE/bin:$PATH

and add eigenpshrenv file and you can create folder like I did to separate it, its your wish you create or not. My file is as it is :- 

#

#

# Environment variables specific for PeopleSoft HR

#

#

if [ -f /oracle/tuxedo/tuxedo12.1.3.0.0/tux.env ]

then

  . /oracle/tuxedo/tuxedo12.1.3.0.0/tux.env

fi

if [ -f /oracle/peopletools/8.55/psconfig.sh ]

then

  . /oracle/peopletools/8.55/psconfig.sh

else

   echo "/oracle/peopletools/8.55/psconfig.sh DOES NOT EXIST"

fi

#

export PS_HOME=/oracle/peopletools/8.55

PATH=$PATH:$PS_HOME/bin:$PS_HOME/cblbin:/oracle/psoft_scripts:.;export PATH

#

# NLS_LANG op UTF8

#

export NLS_LANG=AMERICAN_AMERICA.UTF8

#

# Toegevoegde variabelen voor AE

export PS_PRCS_BASE=$PS_HOME/psft/pt/8.55/appserv/prcs

export PS_BIN=$PS_HOME/bin

export PS_AE_BINARY=$PS_BIN/psae

#

# Working directory in het path zetten

#

export PATH=$PATH:.

#

# Aanpassing Oracle 9i $ORACLE_HOME/lib32 vooraan in SHLIB_PATH

#

SHLIB_PATH=$ORACLE_HOME/lib32:$SHLIB_PATH;export SHLIB_PATH

#

# Adds for integration PeopleSoft MQ

#

LD_LIBRARY_PATH=/opt/mqm/java/lib64:$PS_HOME/colrlib:$LD_LIBRARY_PATH:$PS_HOME/bin;export LD_LIBRARY_PATH

MQ_JAVA_PATH=/opt/mqm/java/lib64

CLASSPATH=/opt/mqm/lib64:/opt/mqm/java/lib64:$PS_HOME/colrlib:$CLASSPATH;export CLASSPATH

PS_CLASSPATH=/opt/mqm/lib64:/opt/mqm/java/lib64:$PS_HOME/colrlib:$CLASSPATH;export PS_CLASSPATH

#

#export PS_APP_HOME=/oracle/application/hcm92

#export PS_CUST_HOME=/oracle/pscustom

export PS_CFG_HOME=/oracle/pia_855

close the session and reopen new session and you can make use of psadmin utility to start and stop webserver.