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$ bash -version
GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
./check_cpu_perf.sh: line 200: [: -lt: unary operator expected
./check_cpu_perf.sh: line 204: [: -lt: unary operator expected

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199 #Display CPU Performance with alert
200 if [ ${SARCPUIDLE} -lt $2 ]
201  then
202                 echo "CRITICAL: $CPU"
203                 exit 2
204  elif [ $SARCPUIDLE -lt $1 ]
205                  then
206                   echo "WARNING: $CPU"
207                   exit 1
208          else
209                   echo "OK: $CPU"
210                   exit 0
211 fi

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$ ./check_cpu_perf.sh 20 10
Cannot open /var/log/sa/sa11: No such file or directory
if [ ${SARCPUIDLE} -lt $2 ]
 then
                echo "CRITICAL: $CPU"
                exit 2
 elif [ $SARCPUIDLE -lt $1 ]
                 then
                  echo "WARNING: $CPU"
                  exit 1
         else
                  echo "OK: $CPU"
                  exit 0
fi
+ '[' -lt 10 ']'
./check_cpu_perf.sh: line 201: [: -lt: unary operator expected
+ '[' -lt 20 ']'
./check_cpu_perf.sh: line 205: [: -lt: unary operator expected
+ echo 'OK: CPU Idle = % | CpuUser=; CpuNice=; CpuSystem=; CpuIowait=; CpuSteal=; CpuIdle=:20:10'
OK: CPU Idle = % | CpuUser=; CpuNice=; CpuSystem=; CpuIowait=; CpuSteal=; CpuIdle=:20:10
+ exit 0