最近在论坛看到两个帖子，一个是IP地址批量转换，另一个是备份文件夹下当天数据到另一个文件夹，并将文件夹命名为$用户名+$时间+$文件名的格式，刚好最近在学习shell就用他们来练手了，算是实践结合理论了。

1. IP批量转换

#!/bin/bash# It is a scripts of IP address quantity convert to hostname.#E_FILE_EXIST=65##if [ ! -f $1 ];then#   echo "Usage:`basename $0` filename."#   exit $E_FILE_EXIST#fi#IP=(`cat $1`)IP=(8.8.8.8202.96.209.5 202.96.209.133 202.96.209.6www.sohu.com)echo ------------------------------------------------------------------------IP_num=${#IP[*]}for ((i=0;i<"$IP_num";i++))dohost_name=`host ${IP[$i]} | awk '{print $NF}'`echo -n -e "${IP[$i]} ---> `echo $host_name` \n"doneecho ------------------------------------------------------------------------IP_number=${#IP[*]}while [ "$IP_number" -gt 0 ]doIP_number=$(($IP_number-1))host_name=`host ${IP[$IP_number]} | awk '{print $NF}'`echo -n -e "${IP[$IP_number]} ---> `echo $host_name`\n"doneecho ------------------------------------------------------------------------exit 0b

2. 备份当天数据

#!/bin/bash# It is backup data scripts of the same days.# Variable "DATA_DIR" is backup diritory.# Variable "BACKUP_DIR" is backup to paths.DATA_DIR="/usr/local/bin/scripts"BACKUP_DIR="/tmp"# ls -l $DATA_DIR# read -p "Please enter dirtory name(Usage:/paths/dirtory):" BACKUP_DIRBACKUP_FILE=(`find $DATA_DIR -mtime -1 | awk -F / '{print $NF}'`)BACKUP_NUM=${#BACKUP_FILE[*]}NOW_USER=`whoami`NOW_DATE=`date +_%Y-%m-%d_`for ((i=1;i<$BACKUP_NUM;i++))do/bin/cp -rf $DATA_DIR/${BACKUP_FILE[$i]} $BACKUP_DIR/"$NOW_USER$NOW_DATE${BACKUP_FILE[$i]}"# 这里有个小技巧，“find -mtime”获取的数据第一个是当前目录，不需要备份，而数组是从0开始；所以这了i从1开始计数刚好规避了这个不需要的备份。echo "copy file(or diretory) \"$DATA_DIR/${BACKUP_FILE[$i]}\" to \"$BACKUP_DIR/$NOW_USER$NOW_DATE${BACKUP_FILE[$i]}\""doneexit 0