shell 脚本实现退点输出

1、elasticsearch启动脚本

#!/bin/bash
export JAVA_HOME=/usr/java/jdk1.8.0_201-amd64
export JAVA_BIN=/usr/java/jdk1.8.0_201-amd64/bin
export PATH=$JAVA_BIN:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH
. /etc/init.d/functions 
function echo_point()
{
  min=1
  max=2
  while [ $min -le $max ]
  do
  for((i=0;i<4;i++))
     do
        printf "."
        sleep 1
     done
 min=`expr $min + 1`  
 done
 printf "   "
}


case $1 in
start)

    su - elasticsearch<<!
    cd /opt/kidx/deploy/elasticsearch && ./bin/elasticsearch -d
exit
!
    echo_point
    action  "elasticsearch startup" /bin/true
    ;;  
stop)
    es_pid=`ps aux|grep elasticsearch | grep -v "grep elasticsearch" | grep -v "--color" | awk '{print $2}'`
    for i in $es_pid;
    do
        kill -9 $i
    done
    echo_point 
    action "elasticsearch stop" /bin/true
    ;;  
restart)
    es_pid=`ps aux|grep elasticsearch | grep -v "grep elasticsearch" | grep -v "--color" | awk '{print $2}'`
    for i in $es_pid;
    do
        kill -9 $i
    done
    echo_point 
    action "elasticsearch stop" /bin/true
    
    su - elasticsearch<<!
    cd /opt/kidx/deploy/elasticsearch && ./bin/elasticsearch -d
exit
!
    echo_point 
    action "elasticsearch startup" /bin/true
    ;;
  
status)
    es_pid=`ps aux|grep elasticsearch | grep -v "grep elasticsearch" | grep -v "--color"| awk '{print $2}'|wc -l`
    if [ $es_pid -eq 0 ];then
         action "elasticsearch is down...." /bin/true
    else
         action "elasticsearch is running..." /bin/true
    fi
    ;; 
*)
    echo "start|stop|restart"
    ;;  
esac

2、循环输出退格省略号

#!/bin/sh
function start_pro()
{
  min=1
  max=2
  while [ $min -le $max ]
  do
  for((i=0;i<6;i++))
  do
        printf "."
        #printf " "
        #printf ""
        sleep 1
  done
  tab
 min=`expr $min + 1`  #i++
 #printf $min
 done
 printf "
"
}


function tab()
{
  for((i=0;i<6;i++))
  do
        printf ""  #退回
        sleep 1
  done
}




case $1 in
        start)
        start_pro
        ;;
        stop)
        echo "stop....."
        ;;
esac