Shell Programming and Scripting

Error:  s1.sh: line 19: ((: j<: syntax error: operand expected (error token is "<")

#!/bin/bash

str=$(ps -eaf | grep smon | grep -v grep | awk ' {print $8}' | cut -c10-18)

i=1

while [ 1 ]
do
        temp=`echo $str|awk '{print $"'$i'"}'`
        if [ "$temp" = "" ]
        then
                break
        fi
        eval "var_$i"=$temp
        i=`expr $i + 1`

done

for ((j=1;j<$i;j++))
do
     export ORACLE_SID='$'var_$j
     source $HOME/.bash_profile
     $ORACLE_HOME/bin/sqlplus / as sysdba << EOF
     spool '/u02/lak/s1.txt' append
     select username from all_users;
     spool off;
EOF

done



str=" TEST LAK"

str=$(ps -eaf | grep smon | grep -v grep | awk ' {print $8}' | cut -c10-18)

$ grep -H 'unset i' /etc/bashrc
/etc/bashrc:    unset i