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Check the value of an variable

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http://www.unix.com – Code: #!/bin/sh  echo "Running Script to capture ORACLE Erros"  # Change Directory to the actual logs path  cd /home/nv8510/lognew  err_var=`grep -in "ORA-" *`    if[-n $var] then  echo "THESE ARE THE ORACLE ERROR OCCURED"  echo "$err_var"  echo "************************************************************************"  else   echo "No erros"  fi In the abv script i want to chk if the variables exits then i will display all the error msg and if not it will display No e (HowTos)