今天真的忙過死去活來！在決定放棄使用 Pacific Internet 的寬頻而改用 PCCW 的一刻，已經知道會有這一天的來臨‧‧‧ 無耐 Pacific Internet 實在不爭氣，連我這個 Reseller Partner 也要‧‧‧

接著就是要將我的 Servers (幾部) 的網絡設定，DNS，HTTPD，SENDMAIL，‧‧‧ 全部也要將 IP 更換下來，痛苦‧‧‧

幸好徙網路上找到了一個可以將文字更換的程式，工作就可以比較輕鬆地完成！

#!/bin/bash
        #       This script will search and replace all regular files for a string
        #       supplied by the user and replace it with another string.
        #
        #       Written by Daniel McCarthy
        #       daniel.mccarthy@linuxphile.org
        #
        function usage {
                echo ""
                echo "Search/replace script"
                echo "    Written by Daniel McCarthy"
                echo "      daniel.mccarthy@linuxphile.org"
                echo "      http ://linuxphile.org"
                echo ""
                echo "Not enough parameters provided."
                echo "Usage: ./$0 searchstring replacestring"
                echo "Remember to escape any special characters in the searchstring or the replacestring"
                echo ""
        }

        #check for required parameters
        if  [ ${ #1 } -gt 0  ]  &&  [ ${ #2 } -gt 0  ];
        then
        for f in `find  -type f`;
        do
                if grep -q $1 $f;
                then
                        cp $f $f.bak
                        echo "The string $1 will be replaced with $2 in $f"
                        sed s/$1/$2/g < $f.bak > $f
                        rm $f.bak
                fi
        done

        else
        #print usage informamtion
        usage
fi

參考：http://linuxphile.org/node/13