Shell 脚本的一些常用语法分析

#!/bin/sh

echo "
 *************************************
 *          Author by gomyck         *
 * --------------------------------  *
 *|  qq:    474798383              | *
 *|  email: hao474798383@163.com   | *
 *|  blog:  https://blog.gomyck.com| *
 * --------------------------------  *
 *************************************
 "

JAVA_HOME=
RESOURCE_NAME=*.jar
LOG_PATH="/dev/null"
ACTIVE=ck

while [ -n "$1" ] # -n 参数的含义: 判断 $1 是否是 null, 长度大于 0
do
    case "$1" in
        -log | -l)  # | 是或者, 必须使用一个竖线, 不可以用 ||
			LOG_PATH="$2"   # 赋值, 左右不可以有空格
            echo "日志输出位置: $2"  
            shift ;;  # 移动游标, 使当前参数数组的初始游标向右位移一位,  比如  1 2 3 4 5 起始 $1 是 1, shift 之后  $1 就是 2
        -profile | -p) 
			ACTIVE="$2"
            echo "激活配置: $2"
            shift ;;
        --) shift
            break ;;
        *) ACTIVE="$1";;
    esac
    shift
done

if [[ ${ACTIVE} != "pro" && ${ACTIVE} != "dev" && ${ACTIVE} != "test" ]]; then
echo "Please input a model you want active -> [dev pro test]"
exit
fi
PARAM_VALUE='-Dfile.encoding=UTF-8 -Deureka.instance.ip-address= -Djasypt.encryptor.password='
if [[ ${ACTIVE} ==  "test" || ${ACTIVE} ==  "dev" ]]; then
	echo "开发测试环境, 日志默认输出位置: ./gomyck.log"
	LOG_PATH="gomyck.log"
fi
tpid=`ps -ef|grep $RESOURCE_NAME|grep -v grep|grep -v kill|awk '{print $2}'`  # 追溯进程号, 赋值
if [ ${tpid} ]; then
echo Close Application... ${tpid}
kill -15 $tpid
fi

sleep 5

tpid=`ps -ef|grep $RESOURCE_NAME|grep -v grep|grep -v kill|awk '{print $2}'`
if [ ${tpid} ]; then
echo Close Application... ${tpid}
kill -9 $tpid
else
echo Close Success!
echo Bootstrap Application...
fi

rm -f tpid

if [ ${JAVA_HOME} ]; then
    nohup $JAVA_HOME/bin/java -jar $PARAM_VALUE -Dspring.profiles.active=${ACTIVE} ./$RESOURCE_NAME > ${LOG_PATH} 2>&1 & 
else
    nohup java -jar $PARAM_VALUE -Dspring.profiles.active=${ACTIVE} ./$RESOURCE_NAME > ${LOG_PATH} 2>&1 & 
fi

echo $! > tpid
echo Application is Running!!!

if [[ ${ACTIVE} ==  "test" || ${ACTIVE} ==  "dev" ]]; then
	tail -f gomyck.log
fi