Linux修改主机名脚本-不重启-支持RedHat、SUSE

#!/bin/bash
PATH=/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
export PATH

New_Hostname=$1
OSRelease=`lsb_release -i|awk -F : ‘{print $2}‘|sed ‘s/\t//g‘`

#1 Modify /etc/hosts or add one loop entry
Old_Hostname=`grep ${HOSTNAME} /etc/hosts|wc -l`
if [ "$Old_Hostname" != "0"x ]; then
    sed -i "s/${HOSTNAME}/${New_Hostname}/g" /etc/hosts
else
    echo "127.0.0.10 ${New_Hostname}">>/etc/hosts
fi

#2 Modify different OS‘s hostname 
if [[ ${OSRelease} =~ ‘SUSE‘ ]]; then
    echo "this is SUSE machine";
    #modify /etc/HOSTNAME file
    echo ${New_Hostname}>/etc/HOSTNAME;
    #immediate effect
    /etc/rc.d/boot.localnet stop;
    /etc/rc.d/boot.localnet start;
elif [[ ${OSRelease} =~ ‘RedHat‘ ]]; then
    echo "this is RedHat machine";
    sed -i "s/${HOSTNAME}/${New_Hostname}/g" /etc/sysconfig/network;    
else 
    echo "this is donnotknow";
fi

#3 Modify varible
hostname ${New_Hostname}
export HOSTNAME=${New_Hostname}

echo "Hostname modify successfull!"
#今天在写一个脚本遇到问题，----需要在sed中引入shell变量，在网上搜了变天才找到，经过测试
#
#这四种方法都可用，在这里跟大家分享下，=---同时谢谢netman大哥，前辈就是前辈哈哈
#
#1.eval sed ’s/$a/$b/’ filename
#2.sed "s/$a/$b/" filename
#3.sed ’s/’$a’/’$b’/’ filename
#4.sed s/$a/$b/ filename