python读取指定文件指定行数内容

今天个大家介绍下如何利用python读取指定文件中指定行的内容。超级简单，下面直接看代码吧：

[root@279155 ~]# cat safe.sh
#!/bin/bash
cat /var/log/secure | awk '/Failed/{print $(NF-3)}' | sort | uniq -c | awk '{if                                                          ($1 > 10 ) {print $2"="$1}}' > /root/BlackIP.txt
#cat secure | awk '/Failed/{print $(NF-3)}' | sort | uniq -c | awk '{if ($1 > 10                                                         ) {print $2"="$1;}}' > /root/BlackIP.txt

#cat secure | awk '/Failed/{print $(NF-3)}' | sort | uniq -c | awk '{if ($1>10)                                                          {print $2"="$1;}}' > /root/BlackIP.txt

for i in $(cat /root/BlackIP.txt)
do
        IP=$(echo $i | awk -F= '{print $1}')
        grep $IP /etc/hosts.deny
        if [ $? -gt 0 ];
        then
                echo "sshd:$IP " >> /etc/hosts.deny
        fi
done
[root@279155 ~]# python
Python 2.6.6 (r266:84292, Dec  7 2011, 20:38:36)
[GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import linecache                                      #导入模块
>>> theline=linecache.getline("/root/safe.sh",2)         #2个参数，第一个是指定文件，第二个是指定行数
>>> print theline                                        #打印出内容
cat /var/log/secure | awk '/Failed/{print $(NF-3)}' | sort | uniq -c | awk '{if                   
转自http://www.pyshell.com/index.php/archives/223