Useful Linux Commands for oracle applications

Changing directory (cd) with variables

To resolve the environment variables (e.g. $XXX_TOP/test) passed as concurrent program argument to Host script


dirpath="$(echo $8)"
eval cd "$dirpath"
echo pwd


or to resolve path using eval

dirpath="$(echo $8)"
dirpath1=$(eval echo $dirpath)
echo "dirpath --> $dirpath1"


Call Pl-Sql procedure from shell script with out variable

 SQLVAR=`sqlplus -s $APPS_USER_ID <<ENDOFSQL  
 SET SERVEROUTPUT ON SIZE 1000000  
 whenever sqlerror exit 1;  
 declare  
 v_errorlog VARCHAR2(4000);  
 begin  
 pkg.prc(p_arg1 => $arg1, p_arg2 => $arg2, p_error_out => v_errorlog);    
 dbms_output.put_line('v_errorlog  --> '||v_errorlog);  
 end;  
 /  
 exit;  
 ENDOFSQL`  
 echo " SQLVAR output is - $SQLVAR"  

For only package call

 SQLVAR=`sqlplus -s $APPS_USER_ID <<ENDOFSQL  
 set heading off newpage 0 pagesize 0;  
 exec pkg.prc(p_arg1 => $arg1, p_arg2 => $arg2);  
 exit;  
 ENDOFSQL`  
 echo " SQLVAR output is - $SQLVAR"       

To Cut a string from the end by identifier
Cut string from the end by identifier "/" eg: /abc/def/fdf/abc.dat

OUTPUT='/abc/def/fdf/abc.dat'

 l1=$(echo $OUTPUT | awk -F"/" '{print length($0)-length($NF)}')  
 l2=`expr $l1 + 1`  
 echo "l2 $l2"  
 l3=$(echo $OUTPUT | wc -m)  
 echo "l3 $l3"  
 filename=$(echo $OUTPUT | cut -b $l2-$l3)  
 echo "filename --> $filename"