function 一些shell函数

##指定时间后结束指定程序
sh -c "sleep 4 && kill -9 $(pgrep basename `echo $app|awk '{print $1}'`)" &
for i in {1..1000};do
  echo $i
  sleep 1
done

检测当前脚本是否已经运行，如果已经运行，则退出
ps -ef|grep $(basename $0|sed 's/\./\\\./g')|grep -v grep|grep -v $$
if [ "$?" -eq 0 ];then
  echo scripts already running...
  exit 1
fi

测试ip是否可以ping通
check_ping(){
  ip=$1
  shift
  case $1 in
    -c)
      loss_Con=$2
      shift 2 ;;
    -d)
      delay_Thold=$2
      shift 2 ;;
    *|-h|--help)
      echo Usage:$(basename $0) '{host} {-c count of ping} {-d delay_Thold}'
      return 1
      ;;
  esac
  #loss_Con=4
  #delay_Thold=20
  count=0
  for ((i=0;i<$loss_Con;i++));do
    DL=$(ping $ip -c 1 -W 1|grep from|awk '{print $7}'|awk -F"=" '{print $2}'|awk -F"." '{print $1}')
    if [ -z "$DL" ] || [ "$DL" -ge $delay_Thold ];then
      count=$(($count+1))
    fi
  done
  if [ "$count" -eq $loss_Con ];then
    return 1
  else
    return 0
  fi
}

check_ping(){
  ip=$1 #1.1.1.1
  loss_Con=$2 #2
  delay_Thold=$3 #4
  count=0
  for ((i=0;i<$loss_Con;i++));do
    DL=$(ping $ip -c 1 -W 1|grep from|awk '{print $7}'|awk -F"=" '{print $2}'|awk -F"." '{print $1}')
    if [ -z "$DL" ] || [ "$DL" -ge $delay_Thold ];then
      count=$(($count+1))
    fi
  done
  if [ "$count" -eq $loss_Con ];then
    return 1
  else
    return 0
  fi
}

check_ping(){
  ip=$1
  shift
  case $1 in
    -c)
      loss_Con=$2
      shift 2 ;;
    -d)
      delay_Thold=$2
      shift 2 ;;
    *|-h|--help)
      echo Usage:$(basename $0) '{host} {-c count of ping} {-d delay_Thold}'
      return 1
      ;;
  esac
  #loss_Con=4
  #delay_Thold=20
  count=0
  for ((i=0;i<$loss_Con;i++));do
    DL=$(ping $ip -c 1 -W 1|grep from|awk '{print $7}'|awk -F"=" '{print $2}'|awk -F"." '{print $1}')
    if [ -z "$DL" ] || [ "$DL" -ge $delay_Thold ];then
      count=$(($count+1))
    fi
  done
  if [ "$count" -eq $loss_Con ];then
    return 1
  else
    return 0
  fi
}

##把字符串中的特殊字符加上 \
zhuanyi(){
  echo $1|awk '
BEGIN{
FS=""
}
{
str="([]."
for(i=1;i<=NF;i++)
{
    if(index(str,$i) == 0)
    {
        printf $i
    }
    else
    {
        printf "\\"$i
    }
}
printf "\n"
}'
}

有三个参数，第一个查找目标字符串，第二个要替换成的字符串，第三个操作的文件

addarg(){
  PATTERN=$(zhuanyi $1)
  REPLACE=$2
  FILE=$3
  REPLACE1=$(echo $REPLACE1|awk -F"=" '{print $1"="}')
  grep ^$REPLACE1 $FILE > /dev/null|| sed -i '/'$PATTERN'/ a '$REPLACE'' $FILE
}
addarg [mysqld] slave-skip-error=all my.cnf  在my.cnf中 [mysqld] 所在行在下面添加 slave-skip-error=all
slave-skip-error=all