#!/bin/sh
factorial=1
for a in `seq 1 10`
do
factorial=`expr $factorial \* $a`
done
echo "10! = $factorial"
注：上面有一行，for a in `seq 1 10`,其中seq 1 10 , 即列出现1到10之间所有的数字，这一行也可改为：for a in "1 2 3 4 5 6 7 8 9 10"
#!/bin/sh
unset var
while [ "$var" != "end" ]
do
echo -n "please input a number: "
read var
if [ "$var" = "end" ]
then
break
fi
echo "var is $var"
done
3. 写一个脚本，利用循环和continue关键字，计算100以内能被3整除的数之和
#!/bin/sh
sum=0
for a in `seq 1 100`
do
if [ `expr $a % 3` -ne 0 ]
then
continue
fi
echo $a
sum=`expr $sum + $a`
done
echo "sum = $sum"
4．一个函数，利用shift计算所有参数乘积，假设参数均为整数( 特殊变量$# 表示包含参数的个数)
#! /bin/sh
result=1
while [ $# -gt 0 ]
do
result=`expr $result \* $1`
shift
done
echo $result
#!/bin/sh
case ${1##*.tar.} in
bz2)
tar jxvf $1
;;
gz)
tar zxvf $1
;;
*)
echo "wrong file type"
esac
#!/bin/sh
RPM=/bin/rpm
option="-q"
while true
do
echo "what to query?"
select var in "All" "file" "package name"
do
case $var in
All)
option=$option"a"
break
;;
file)
echo -n "please input file name: "
option=$option"f"
read argument
break
;;
package\ name)
echo -n "please input package name: "
read argument
break
;;
*)
echo "please choose between 1-3"
;;
esac
done
echo "what do you want to know?"
select var in "location" "info" "package name"
do
case $var in
location)
option=$option"l"
break
;;
info)
option=$option"i"
break
;;
package\ name)
break
;;
*)
echo "please choose between 1-3"
;;
esac
done
${RPM} $option $argument
echo "continue? [yes/no]"
read answer
if [ answer = "no" ]
then
break
fi
done
