_COLORS=${BS_COLORS:-$(tput colors 2>/dev/null || echo 0)}
__detect_color_support() {
  # shellcheck disable=SC2181
  if [ $? -eq 0 ] && [ "$_COLORS" -gt 2 ]; then
    RC='\033[1;31m'
    GC='\033[1;32m'
    BC='\033[1;34m'
    YC='\033[1;33m'
    EC='\033[0m'
  else
    RC=""
    GC=""
    BC=""
    YC=""
    EC=""
  fi
}
__detect_color_support
echoerror() {
  printf "${RC} * ERROR${EC}: %s\\n" "$@" 1>&2;
}
echoinfo() {
  printf "${GC} * INFO${EC}: %s\\n" "$@";
}
echowarn() {
  printf "${YC} * WARN${EC}: %s\\n" "$@";
}

#! /bin/sh
#日志目錄及限定大小
workdir="/var/*.log"
maxsize=100
#搜索最老文件,不加目錄默認(rèn)的本目錄里邊的文件 r倒序輸出 t時(shí)間 head -n1取第一行 awk命令括號(hào)$1位文件名 管道連接
oldfile(){
 oldfile=`ls $workdir -t 2>/dev/null| head -n1 | awk '{printf $1}'`
}
clear_old_log(){
 if [ ! $oldfile ]
 then
  #echo "日志不存在" 1>/dev/null
  return 0
 fi
  while true;
 do
  oldfile
  if [ ! $oldfile ]
  then
    return 0
  fi
  logsize=`du -ms $oldfile 2>/dev/null| awk '{printf $1}'` #m表示兆 k b
  if [ $logsize -gt $maxsize ]
  then
  str1="log"
  str2="err"
  if [[ $oldfile == *$str1* ]] 
  then
  pkill snake
  rm -rf $oldfile
   fi
   if [[ $oldfile == *$str2* ]]
   then
  service mysql restart
  pkill snake
  rm -rf $oldfile
  fi
  else
  break
  fi
 done
}
testing(){
 
 while true;
 do
  workdir="/var/*.log"
  oldfile 
   clear_old_log
   workdir="/var/lib/mysql/*.err"
   oldfile
   clear_old_log
  done
}
testing
定時(shí)任務(wù)腳本：
#! /bin/sh
#a=`pgrep -f test1.sh|wc -l`
#if [ $(ps -ef|grep test.sh|wc -l) -gt 1 ]
if test $(pgrep -f test.sh|wc -l) -ge 1
 then
 exit
fi
cd /home/zxd/
./test.sh
下邊這個(gè)帶有日志時(shí)間加時(shí)間戳及系統(tǒng)負(fù)載檢測(cè)：
#! /bin/bash
strA="long string"
strB="string"
result=$(echo $strA | grep "${strB}")
if [[ "$result" != "" ]]
then
  echo "包含"
else
  echo "不包含"
fi
#日志目錄及限定大小
workdir="/var/*.log"
maxsize=100
#給文件加時(shí)間戳:函數(shù)里的變量必須在腳本函數(shù)后邊跟著,這里$1不是命令行跟的參數(shù),命令行的參數(shù)為腳本的$1
filetime(){
 a=$(date +%Y%m%d%H%M%S)
 A=$1.$(date +%Y%m%d%H%M%S)
 echo $A
}
filetime "/var/log"
#搜索最老文件,不加目錄默認(rèn)的本目錄里邊的文件 r倒序輸出 t時(shí)間 head -n1取第一行 awk命令括號(hào)$1位文件名 管道連接
oldfile(){
 oldfile=`ls $workdir -rt 2>/dev/null| head -n1 | awk '{printf $1}'`
}
clear_old_log(){
 if [ ! $oldfile ]
 then
  echo "日志不存在" 1>/dev/null
  return 0
 fi
  while true;
 do
  oldfile
  if [ ! $oldfile ]
  then
  echo "日志不存在" 1>/dev/null
   return 0
  fi
  logsize=`du -bs $oldfile 2>/dev/null| awk '{printf $1}'`
  if [ $logsize -gt $maxsize ]
  then
  str1="log"
  str2="err"
  if [[ $oldfile == *$str1* ]] 
  then
  pkill snake
  rm -rf $oldfile
   fi
   if [[ $oldfile == *$str2* ]]
   then
  service mysql restart
  pkill snake
  rm -rf $oldfile
   fi
  else
  break
  fi
 done
}
testing(){
 echo "run"
 while true;
 do
  oldfile 
   clear_old_log
   echo "222"
   workdir="/var/lib/mysql/libmaster.err"
   oldfile
   clear_old_log
  done
}
disk=`df |grep /dev/mapper/fedora-root | awk '{printf $5}' | sed 's/%//g'`
echo "磁盤已用：%$disk"
memtotal=`cat /proc/meminfo |grep MemTotal |awk '{printf $2}'`
memfree=`cat /proc/meminfo |grep MemFree |awk '{printf $2}'`
used=$((100- memfree*100/memtotal))
echo "內(nèi)存已用：%$used"
echo "exit"
testing