嵌入式考试Shell编程题

单片机与嵌入式系统考试Shell编程题库，简单地做了下。

9. 与题7类似，多了个乘法运算。

#!/bin/bash
# test1.sh
# 2016.1.2

echo "Please input N student grade:"
read -a grade
for ((i=0;i<${#grade[@]};i++))
do
    if [[ ${grade[i]} -ge 90 ]]
    then
        grade[i]=5
    elif [[ ${grade[i]} -ge 80 ]]
    then
        grade[i]=4
    elif [[ ${grade[i]} -ge 70 ]]
    then
        grade[i]=3
    elif [[ ${grade[i]} -ge 60 ]]
    then
        grade[i]=2
    else
        grade[i]=1
    fi
done
#echo ${grade[*]}
echo ${grade[*]} > score.dat

#!/bin/bash
# test2.sh
# 2016.1.2

echo "Please input N number:"
read -a arr
for ((i=0;i<${#arr[@]};i++))
do
    for ((j=${#arr[@]}-1;j>i;j--))
    do
        if [[ ${arr[j]} -lt ${arr[j-1]} ]]
        then
            t=${arr[j]}
            arr[j]=${arr[j-1]}
            arr[j-1]=$t
        fi
    done
done
echo ${arr[*]} > result.dat

#!/bin/bash
# test3.sh
# 2016.1.2

cd /home
if test -e tesh.sh
then
    rm tesh.sh
else
    touch tesh.sh
fi

#!/bin/bash
# test4.sh
# 2016.1.2

if [ -z "$1" ]
then
    echo "You should input N num!"
    exit 1
fi

max=$1
min=$1
for num in $*
do
    if [ $num -gt $max ]
    then
        max=$num
    fi
    if [ $num -lt $min ]
    then
        min=$num
    fi
done
echo "Max: $max , Min: $min"

#!/bin/bash
# test5.sh
# 2016.1.2

j=0;
for ((i=1;i<=100;i++))
do
    j=`expr $i + $j`
done
echo $j

#!/bin/bash
# test6.sh
# 2016.1.2

echo "Input 1 char:"
read a
if [ $a = ‘Y‘ ]
then
    echo "right!"
elif [ $a = ‘N‘ ]
then
    echo "wrong!"
else
    echo "bad input!"
fi

#!/bin/bash
# test7.sh
# 2016.1.2

echo "Input 2 Number:"
read a
read b
echo "Input + or - :"
read op
if [ $op = ‘+‘ ]
then
    x=`expr $a + $b`
elif [ $op = ‘-‘ ]
then
    x=`expr $a - $b`
fi
echo $x

#!/bin/bash
# test8.sh
# 2016.1.2

cd /home
if test -d exam
then
    rm -r exam
else
    mkdir exam
fi

#!/bin/bash
# test9.sh
# 2016.1.2

echo "Input 2 Number:"
read a
read b
echo "Input + or - or x:"
read op
if [ $op = ‘+‘ ]
then
    x=`expr $a + $b`
elif [ $op = ‘-‘ ]
then
    x=`expr $a - $b`
elif [ $op = ‘x‘ ]
then
    x=`expr $a \* $b`
fi
echo $x

OK！