16_4.sh

该程序是一个计算成绩的源代码

#!/bin/sh
num="$#"
if [ $num != 2 ]
   then
      echo "Usage: $0 two integer-argument!"
      exit 1
fi

firnum="$1"
secnum="$2"

if [ $firnum -lt $secnum ]
   then
      while [ $firnum -le $secnum ]
         do
           echo "$firnum "
           firnum=`expr $firnum + 1`
         done
         exit 0
   elif [ $firnum -gt $secnum ]
      then
         while [ $firnum -ge $secnum ]
            do
              echo "$firnum "
              firnum=`expr $firnum - 1`
            done
            exit 0
   else
      echo "They are equl! Both are: $firnum"
      exit 1
fi
echo