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
 default 

 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

menu.lst

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 =
 #SCC domain ip
 Domain = 10.0.73.14
 CallTimeout = 

 #RDS client working thread num (--)
 RDSClientThreadNum =
 #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@

 MsIp = 127.0.0.1
 MsPort = 

CenterServer.conf

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 

conf.sh

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 

conf.sh