linux shell 脚本获取和替换文件中特定内容

1.从一串字符串中获取特定的信息

要求1：获取本机IP：menu.lst为系统镜象的IP配置文件，需要从中获取到本机IP信息（从文件获取信息）

timeout 1
default 0

title live
find --set-root /casper/vmlinuz
kernel /casper/vmlinuz boot=casper ignore_uuid showmounts ip=eth0,10.0.66.66,255.255.240.0,10.0.64.3
initrd /casper/initrd.lz

要求2：修改(替换)原文件中特定内容：CenterServer.conf为SCC可执行程序的配置文件，需要将配置文件中的domain值改为本机IP。

#CenterServer config file

# Logging Type: syslog|cerr|cout|file
LoggingType = cout

# Logging level: NONE|CRIT|ERR|WARNING|INFO|DEBUG|STACK
LogLevel = DEBUG
#LogLevel = INFO

#sip listen port
UDPPort = 5060
#SCC domain ip
Domain = 10.0.73.14
CallTimeout = 60

#RDS client working thread num (1--8)
RDSClientThreadNum = 2
#RDS Client Log on|off
RDSClientLog = off

#Daemon process yes|no, default=yes
IsDaemon = no

#Web server addr
WebServerUrl = http://localhost:9000

#SCC state Database
DataBase = scc
MySqlUserName = root
MySqlUserPasswd =jonet@666

MsIp = 127.0.0.1
MsPort = 9999

实现脚本：

#!/bin/sh
MENULST="/JONET_boot/menu.lst"
SCC_PATH="/JONET/bin/SCC/CenterServer.config"
LOCALIP="`awk -F ',' '{print $2}' $MENULST |grep .`";
echo $LOCALIP

modify_scc()
{
    DOMAIN="`cat $SCC_PATH|grep Domain`"
    echo $DOMAIN
    echo $LOCALIP
    #sed -e 's/Domain = 10.0.66.66/Domain = 10.0.73.15/g' $SCC_PATH
    sed -i 's/'"${DOMAIN}"'/Domain = '"${LOCALIP}"'/g' $SCC_PATH
}


modify_conf()
{
    modify_scc
}

modify_conf

exit 0

说明：sed -i 's/'"${DOMAIN}"'/Domain = '"${LOCALIP}"'/g' $SCC_PATH

　　由于宏定义DOMAIN和LOCALIP在命令中使用$DOMAIN和$LOCALIP无法使用，需要使用'"${DOMAIN}"'和'"${LOCALIP}"'，使执行脚本时能够替换

#!/bin/sh
MENULST="/JONET_boot/menu.lst"
SCC_PATH="/JONET/bin/SCC/CenterServer.config"
LOCALIP="`awk -F ',' '{print $2}' $MENULST |grep .`";
echo $LOCALIP

modify_scc()
{
    DOMAIN="`cat $SCC_PATH|grep Domain`"
    echo $DOMAIN
    echo $LOCALIP
    sed -i 's/'"${DOMAIN}"'/Domain = '"${LOCALIP}"'/g' $SCC_PATH
}

modify_conf()
{
    modify_scc
}

modify_conf

exit 0