grade.sh

该程序是一个计算成绩的源代码

#!/bin/sh
n=`cat grade1.txt | wc | awk '{print $1}'`
i=1

while  [ $n -gt 0 ]
do
     record=`sed -n "$i p" grade1.txt`
     echo -e "$record \c"
     echo -e "$record \c" >> grade2.txt
     a=`sed -n "$i p" grade1.txt | awk '{print $2}'`
     b=`sed -n "$i p" grade1.txt | awk '{print $3}'`
     c=`sed -n "$i p" grade1.txt | awk '{print $4}'`
     sum=`expr $a + $b + $c`
     avg=`expr $sum / 3`
     echo -e "$sum \c"
     echo -e "$sum \c" >> grade2.txt
     echo $avg
     echo $avg >> grade2.txt
     n=`expr $n - 1`
     i=`expr $i + 1`
done
exit 0