更新主机列表文件

用于小型网络，更新主机列表文件(/etc/hosts)的脚本，主机列表保存在~/company/hostlist中：

#!/bin/sh

#定义变量


TMPFILE="/tmp/hostlist"         #临时文件

#指定主机列表文件
HOSTLIST=$(echo ~/company/hostlist)
#这里是需要更新的主机列表
ARGS="$*"
#为每台主机更新
for host in $ARGS;
do
        echo "Create a hosts file for $host ..."
        HOSTNAME=$(ssh -l root $host "hostname")
        echo "127.0.0.1               $HOSTNAME localhost.localdomain localhost" >$TMPFILE
        echo >>$TMPFILE
        cat $HOSTLIST >>$TMPFILE
        echo "update the hosts file for $host ..."
        cat $TMPFILE |ssh -l root $host "cat >/etc/hosts"
        echo "The hosts file on $host has been updated."
done

用法:
hostlist.sg newhost1 newhost2 newhost3 ....