shell读取配置文件的方式sed命令详解

# cat -n config.ini
 #MYSQL配置项
 [MYSQL]
 DB_HOST=192.168.0.1
 DB_PORT=3306
 DB_USER=root
 DB_PASSWD=mysql1234
 DB_NAME=system_manager1

 #MYSQL_1配置项
 [MYSQL_1]
 MYSQL_DB_HOST=192.168.0.2
 MYSQL_DB_PORT=2200
 MYSQL_DB_USER=root
 MYSQL_DB_PASSWD=mysql123456
 MYSQL_DB_NAME=bigdata1
 MYSQL_INIT_SQL='set slave;stop backup;'

 #REDIS配置项
 [REDIS]
 DB_HOST=192.168.0.1
 DB_PORT=6379
 DB_ID=4
 DB_PASSWD=redis1234

# grep -n -E '^\[' config.ini |grep -A 1 "\[MYSQL\]"|awk -F ':' '{print $1}'|xargs
2 10

# grep -n -E '^\[' config.ini |grep -A 1 "\[REDIS\]"|awk -F ':' '{print $1}'|xargs
19

# sed -n "2,10 s/DB_HOST=//p" config.ini
192.168.0.1

# sed -n "19,$ s/DB_PORT=//p" config.ini
6379

# sed -r -n 's/(^MYSQL_INIT_SQL=)(.*)$/\2/p' config.ini
'set slave;stop backup;'

# sed -r -n 's/(^MYSQL_DB_HOST=)(.*)$/\2/p' config.ini
192.168.0.2

# cat config.sh
#!/bin/bash
set -e

exit_script(){
   exit 1
}

if [ "$#" = 0 ]; then
    echo "参数错误，命令格式为:    ./config.sh configfile"
    exit_script
else
    configPath=$1
fi

function get_line_num(){
    local configKey=$1
    grep -n -E '^\[' ${configPath} |grep -A 1 "\[${configKey}\]"|awk -F ':' '{print $1}'|xargs
}

function get_config(){
    #local configPath=$1
    local configKey=$1
    local configName=$2
    local line_num=$(get_line_num $configKey)
    local startLine=$(echo $line_num |awk '{print $1}')
    local endLine=$(echo $line_num|awk '{print $2}')
    if [ ${endLine} ];then
        sed -n "${startLine},${endLine} s/${configName}=//p" ${configPath}
    else
        sed -n "${startLine},$ s/${configName}=//p" ${configPath}
    fi
}

if [ -f $configPath ];then
    MYSQL_DB_HOST=$(get_config MYSQL DB_HOST)
else
    echo ${configPath}"文件不存在,请检查配置文件是否存在"
    exit_script
fi
MYSQL_DB_PASSWD=$(get_config MYSQL DB_PASSWD)
MYSQL_DB_USER=$(get_config MYSQL DB_USER)
REDIS_DB_HOST=$(get_config REDIS DB_HOST)
REDIS_DB_PASSWD=$(get_config REDIS DB_PASSWD)

MYSQL_DB_HOST=$(sed -r -n 's/(^MYSQL_DB_HOST=)(.*)$/\2/p' $configPath)
MYSQL_DB_NAME=$(sed -r -n 's/(^MYSQL_DB_NAME=)(.*)$/\2/p' $configPath)
INIT_SQL=$(sed -r -n 's/(^MYSQL_INIT_SQL=)(.*)$/\2/p' $configPath)

echo "MYSQL_DB_HOST="${MYSQL_DB_HOST}
echo "MYSQL_DB_PASSWD="${MYSQL_DB_PASSWD}
echo "MYSQL_DB_USER="${MYSQL_DB_USER}
echo "REDIS_DB_HOST="${REDIS_DB_HOST}
echo "REDIS_DB_PASSWD="${REDIS_DB_PASSWD}

echo "-----------------分割线-------------"
echo "使用sed读取配置：MYSQL_DB_HOST="${MYSQL_DB_HOST}
echo "使用sed读取配置：MYSQL_DB_NAME="${MYSQL_DB_NAME}
echo "使用sed读取配置：MYSQL_INIT_SQL="${INIT_SQL}