shell脚本，通过传参求斐波那契数列如（0,1,1,2,3,5,8,13..........）

[root@localhost wyb]# cat fibo.sh
#!/bin/bash

#斐波那契数列 ,,,,,,,

echo  > file
echo  >> file

count=$

for i in `seq $count`
do
first=$(tail - file |head -)
two=$(tail - file)
echo $((first+two)) >> file
done
cat file
[root@localhost wyb]# bash fibo.sh 

[root@localhost wyb]# bash fibo.sh 

[root@localhost wyb]# 

第二种方法，通过间接赋值来来传。用到read -p

[root@localhost wyb]# cat 2fibo.sh
#!/bin/bash

#斐波那契数列 ,,,,,,,

echo  > file
echo  >> file

#count=$
read -p "Please Input a  number:" count
for i in `seq $count`
do
first=$(tail - file |head -)
two=$(tail - file)
echo $((first+two)) >> file
done
cat file
[root@localhost wyb]# bash 2fibo.sh
Please Input a  number:

[root@localhost wyb]# bash 2fibo.sh
Please Input a  number:

[root@localhost wyb]# bash 2fibo.sh
Please Input a  number:

[root@localhost wyb]#