[Shell编程]写了一段shell代码，运行发现代码块（标红的）执行的预期结果出不来，谁能帮我看看？

Posted 2020-12-22 cnskylee

【原代码】

Mem_Usage=91.00

CPU_Usage=85.00

if [[ `expr $Mem_Usage > 90.00` -eq 1 ]];then
    echo "Memory highly used! "
elif [[ `expr $CPU_Usage > 80.00` -eq 1 ]];then
    echo "CPU highly used! "
elif [[ `expr $Mem_Usage > 90.00` -eq 1 ]] && [[ `expr $CPU_Usage > 80.00` -eq 1 ]];then 
    echo "Memory && CPU highly used!"
else
    echo "Memory && CPU used normal!"
fi

调试运行结果：错误

# sh -x test.sh
+ Mem_Usage=91.00
+ CPU_Usage=95.00
++ expr 91.00 ‘>‘ 90.00
+ [[ 1 -eq 1 ]]
+ echo ‘Memory highly used! ‘
Memory highly used!

------------------------------------------------------------------我是可爱的分割线-------------------------------------------------------------

【修改后的代码】

Mem_Usage=91.00
CPU_Usage=85.00
if [ `expr $Mem_Usage > 90.00` -eq 1 ]  &&  [[ `expr $CPU_Usage > 80.00` -eq 1 ];then
    echo "Memory && CPU highly used!"
elif [ `expr $CPU_Usage > 80.00` -eq 1 ];then
    echo "CPU highly used! "
elif [ `expr $Mem_Usage > 90.00` -eq 1 ];then
    echo "Memory highly used! "
else
    echo "Memory && CPU used normal!"
fi

调试结果输出：正确

# sh -x test.sh
+ Mem_Usage=91.00
+ CPU_Usage=95.00
++ expr 91.00 ‘>‘ 90.00
+ [[ 1 -eq 1 ]]
++ expr 95.00 ‘>‘ 80.00
+ [[ 1 -eq 1 ]]
+ echo ‘Memory && CPU highly used!‘
Memory && CPU highly used!