shell脚本，检查给出的字符串是否为回文

[root@localhost wyb]# cat .sh

#!/bin/bash

#检查给出的字符串是否为回文

read -p "Please input a String:" number

[ -z $number ] && echo "input nothing " && exit 

len=${#number}

count=$((len/))

for i in `seq $count`

do

      lasti=$((len-i+))

      first=`echo $number|cut -c $i`

      two=`echo $number|cut -c $lasti`

     [[ "$first" !=  "$two"  ]] && echo no && exit 

done

echo yes

[root@localhost wyb]# bash .sh

Please input a String:

yes

[root@localhost wyb]# bash .sh

Please input a String:

yes

[root@localhost wyb]# bash .sh

Please input a String:

no

[root@localhost wyb]# bash .sh

Please input a String:

yes

[root@localhost wyb]#

用rev来检查是不是回文

[root@localhost wyb]# cat rev12321.sh

#!/bin/bash

#检查给出的字符串是否为回文

read -p "Please input a String:" number

[ -z $number ] && echo "input nothing " && exit 

a1=`echo $number|tac`

b2=`echo $number|rev`

[[ "$a1" != "$b2" ]] && echo no || echo yes

[root@localhost wyb]# bash rev12321.sh

Please input a String:

no

[root@localhost wyb]# bash rev12321.sh

Please input a String:

yes

[root@localhost wyb]# bash rev12321.sh

Please input a String:

no

[root@localhost wyb]# bash rev12321.sh

Please input a String:

yes

[root@localhost wyb]#

[root@localhost wyb]# cat rev.sh

#!/bin/bash

#检查给出的字符串是否为回文

read -p "Please input a String:" number

[ -z $number ] && echo "input nothing " && exit 

number2=`echo $number|rev`

[[  "$number2"  =  "$number" ]] && echo yes  || echo no

[root@localhost wyb]# bash rev.sh

Please input a String:

yes

[root@localhost wyb]# bash rev.sh

Please input a String:

no

[root@localhost wyb]# bash rev.sh

Please input a String:

yes

[root@localhost wyb]#

巴特西

shell脚本，检查给出的字符串是否为回文

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