Oracle oraset script

#!/bin/bash
# Sets Oracle environment variables.
# Setup: 1. Put oraset file in /etc (Linux), in /var/opt/oracle (Solaris)
# 2. Ensure /etc or /var/opt/oracle is in $PATH
# Usage: batch mode: . oraset 
# menu mode: . oraset
#====================================================
if [ -f /etc/oratab ]; then
OTAB=/etc/oratab
elif [ -f /var/opt/oracle/oratab ]; then
OTAB=/var/opt/oracle/oratab
else
echo 'oratab file not found.'
exit
fi
#
if [ -z $1 ]; then
SIDLIST=$(egrep -v '#|\*' ${OTAB} | cut -f1 -d:)
# PS3 indicates the prompt to be used for the Bash select command.
PS3='SID? '
select sid in ${SIDLIST}; do
if [ -n $sid ]; then
HOLD_SID=$sid
break
fi
done
else
if egrep -v '#|\*' ${OTAB} | grep -w "${1}:">/dev/null; then
HOLD_SID=$1
else
echo "SID: $1 not found in $OTAB"
fi
shift
fi
#
export ORACLE_SID=$HOLD_SID
export ORACLE_HOME=$(egrep -v '#|\*' $OTAB|grep -w $ORACLE_SID:|cut -f2 -d:)
export ORACLE_BASE=${ORACLE_HOME%%/product*}
export TNS_ADMIN=$ORACLE_HOME/network/admin
export ADR_BASE=$ORACLE_BASE/diag
export PATH=$ORACLE_HOME/bin:/usr/ccs/bin:/opt/SENSsshc/bin/\
:/bin:/usr/bin:.:/var/opt/oracle:/usr/sbin
export LD_LIBRARY_PATH=/usr/lib:$ORACLE_HOME/lib