[ILUG] what does this shell script mean

[hrishy samant]

hello 

could anybody explain me this shell script

LEVEL=0
 
function set_level
{
 if [ $LEVEL -ne 0 ]
 then
  if [ $LEVEL -ne $1 ]
  then
   echo "Error in determining level of driver!"
   exit 0
  fi
 fi
 LEVEL=$1
}
 
cat dbs.log
grep "Level 1 driver function settings" dbs.log > null
&& set_level 1 
 
# level-2 has larger queries...
grep "allocate_sql_buffer_area size 16000" dbs.log >
null && set_level 2

if [ $LEVEL -eq 0 ]
then
 echo "warning: level of driver not determined;
defaulting to level 1"
 LEVEL=1
fi
exit $LEVEL

can anybody explain what this &&set_level 1 means


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