#! /bin/bash
sum=0
for i in `seq 1 100`;do
sum=$[$i+$sum]
done
echo $sum
要求:如果输入的数字小于1,则重新输入,直到输入正确的数字为止。
#! /bin/bash
read -p "input number:" n
sum=0;
for((i=0;i<=$n;i++))
do
sum=`expr $sum + $i`
done
echo $sum
要求:所有用户同属于users组。
#! /bin/bash
groupadd users
for i in `seq -w 0 9
uesradd -g users user_0$i4
done
#! /bin/bash
for((i=1;i<20;i++));
do
if(i<10);then
jsj="jsj0$i";
else
jsj="jsj$i";
fi
useradd $jsj
done
#! /bin/bash
echo -n your choice:
read choice
case $choice in
g)echo "She is a girl.";;
G)echo "She is a girl.";;
b)echo "He is a boy.";;
B)echo "He is a boy.";;
*)echo "I don't know.";;
esac
#!/bin/bash
read -p "input number:" a
read -p "input number:" b
read -p "input fuhao:" c
case $c in
+)let "sum=$a+$b"
echo $sum;;
-)let "sum=$a-$b"
echo $sum;;
*)let "sum=$a*$b"
echo $sum;;
/)let "sum=$a/$b"
echo $sum;;
esac