c#委託中的匿名方法和lambda表示式
阿新 • • 發佈:2020-07-19
1.獲取隨機字串或數字
獲取隨機8位字串:
方法1: # echo $RANDOM |md5sum |cut -c 1-8 471b94f2 方法2: # openssl rand -base64 4 vg3BEg== 方法3: # cat /proc/sys/kernel/random/uuid |cut -c 1-8 ed9e032c 獲取隨機8位數字: 方法1: # echo $RANDOM |cksum |cut -c 1-8 23648321 方法2: # openssl rand -base64 4 |cksum |cut -c 1-8 38571131 方法3: # date +%N |cut -c 1-8 69024815
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cksum:列印CRC效驗和統計位元組
2.定義一個顏色輸出字串函式
方法1: function echo_color() { if [ $1 == "green" ]; then echo -e "\033[32;40m$2\033[0m" elif [ $1 == "red" ]; then echo -e "\033[31;40m$2\033[0m" fi } 方法2: function echo_color() { case $1 in green) echo -e "[32;40m$2[0m" ;; red) echo-e "[31;40m$2[0m" ;; *) echo "Example: echo_color red string" esac }
使用方法:echo_color green "test" function關鍵字定義一個函式,可加或不加。
3.批量建立使用者
#!/bin/bash DATE=$(date +%F_%T) USER_FILE=user.txt echo_color(){ if [ $1 == 'green' ]; then echo -e "[32;40m$2[0m" elif [ $1 == 'red' ]; then echo -e "[31;40m$2[0m" fi } # 如果使用者檔案存在並且大小大於0就備份 if [ -s $USER_FILE ]; then mv $USER_FILE $USER_FILE-$DATE.bak echo_color green "$USER_FILE exist, rename ${USER_FILE}-${DATE}.bak" fi echo -e "User Password" >> $USER_FILE echo "-------------------">> $USER_FILE for USER in user{1..10}; do if ! id $USER &>/dev/null; then PASS=$(echo $RANDOM |md5sum |cut -c 1-8) useradd $USER echo $PASS |passwd --stdin $USER &> /dev/dell echo -e "$USER $PASS" >> $USER_FILE echo "$USER User create successful." else echo_color red "$USER User already exists!" fi done
4.檢查軟體包是否安裝
#!/bin/bash if rpm -q sysstat &>/dev/null; then echo "sysstat is already installed." else echo "sysstat is not installed!" fi
5.檢查服務狀態
#!/bin/bash PORT_C=$(ss -ant |grep -c 6443) PS_C=$(ps -ef |grep kube-apiserver |grep -vc grep) if [ $PORT_C -eq 0 -o $PS_C -eq 0 ]; then echo "kube-apiserver service dowmped" else echo "kube-apiserver service running!" fi
6.檢查主機存活狀態
方法1:將錯誤IP放到數組裡面判斷是否ping失敗三次 #!/bin/bash for IP in $IP_LIST; do NUM=1 while [ $NUM -le 3 ]; do if ping -c 1 $IP &> /dev/null; then echo "$IP Ping is successful." break else FAIL_COUNT[$NUM]=$IP let NUM++ fi done if [ ${#FAIL_COUNT[*]} -eq 3 ]; then echo "${FAIL_COUNT[1]} Ping is failure!" unset FAIL_COUNT[*] fi done 方法2:將錯誤次數放到FAIL_COUNT變數裡面判斷是否ping失敗三次 #!/bin/bash for IP in $IP_LIST; do FAIL_COUNT=0 for (( i=1;i<=3;i++)); do if ping -c 1 $IP &>/dev/null; then echo "$IP Ping is successful." break else let FAIL_COUNT++ fi done if [ $FAIL_COUNT -eq 3 ]; then echo "$IP Ping is failure!" fi done 方法3:利用for迴圈將ping通就跳出迴圈繼續,如果不跳出就會走到列印ping失敗 #!/bin/bash ping_success_status() { if ping -c 1 $IP &>/dev/null; then echo "$IP Ping is successful." continue fi } for IP in $IP_LIST; do ping_success_status ping_success_status ping_success_status echo "$IP Ping is failure!" done
7.監控CPU、記憶體和硬碟利用率
#!/bin/bash DATE=$(date +%F" "%H:%M) IP=$(ifconfig eth0 |awk '/netmask/ {print $2}') if ! which vmstat &> /dev/null; then echo "vmstat command no found, Please install procps package." exit 1 fi ## CPU US=$(vmstat |awk 'NR==3 {print $13}') SY=$(vmstat |awk 'NR==3 {print $14}') IDLE=$(vmstat |awk 'NR==3 {print $15}') WAIT=$(vmstat |awk 'NR==3 {print $15}') USE=$(($US+$SY)) if [ $USE -ge 50 ];then echo " Date: $DATE Host: $IP Problem: CPU utilization $USE" fi ## Mem TOTAL=$(free -m |awk '/Mem/ {print $2}') USE=$(free -m |awk '/Mem/ {print $3}') FREE=$(free -m |awk '/Mem/ {print $4+$6}') if [ $FREE -lt 1024 ]; then echo " Date: $DATE Host: $IP Problem: Total=$TOTAL,Use=$USE,Free=$FREE" fi #disk PART_USE=$(df -h |awk -F'[% ]+' 'BEGIN{OFS="="} /^\/dev/ {print $1,$2,$5,$6}') for i in $PART_USE; do PART=$(echo $i |cut -d"=" -f1) TOTAL=$(echo $i |cut -d "=" -f2) USE=$(echo $i |cut -d"=" -f3) MOUNT=$(echo $i |cut -d"=" -f4) if [ $USE -gt 80 ]; then echo " Date: $DATE Host: $IP Total: $TOTAL Problem: $PART=$USE($MOUNT)" fi done
8.批量主機磁碟利用率監控
前提監控端和被監控端SSH免互動登入或者金鑰登入。 寫一個配置檔案儲存被監控主機SSH連線資訊,檔案內容格式:IP User Port
#!/bin/bash HOST_INFO=host.info for IP in $(awk '/^[^#]/ {print $1}' $HOST_INFO); do USER=$(awk -v ip=$IP 'ip==$1 {print $2}' $HOST_INFO) PORT=$(awk -v ip=$IP 'ip==$1 {print $3}' $HOST_INFO) TMP_FILE=/tmp/disk.tmp ssh -p $PORT $USER@$IP df -h > $TMP_FILE USE_RATE_LIST=$(awk 'BEGIN{OFS="="} /^\/dev/ {print $NF,int($5)}' $TMP_FILE) for USE_RATE in $USE_RATE_LIST; do PART_NAME=${USE_RATE%=*} ##從右到左,非貪婪匹配,匹配到的刪除 USE_RATE=${USE_RATE#*=} ##從左到右,非貪婪匹配,匹配到的刪除 if [ $USE_RATE -ge 10 ];then echo "Warning: $IP $PART_NAME Partition usage $USE_RATE%!" fi done done
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9.檢查網站可用性
#!/bin/bash #-------------------- #1)檢查URL可用性 #方法1: check_url() { HTTP_CODE=$(curl -o /dev/null --connect-timeout 3 -s -w "%{http_code}" $1) if [ $HTTP_CODE -ne 200 ]; then echo "Warning: $1 Access failure!" fi } #方法2: check_url_2() { if ! wget -T 10 --tries=1 --spider $1 &>/dev/null; then #-T超時時間,--tries嘗試1次,--spider爬蟲模式 echo "Warning: $1 Access failure!" fi } #check_url www.baidu.com #check_url_2 www.aaaa.com #2)判斷三次URL可用性 #思路與上面檢查主機存活狀態一樣。 #--------------------------------- URL_LIST="www.baidu.com www.agasgf.com" #------ #方法1:利用迴圈技巧,如果成功就跳出當前迴圈,否則執行到最後一行 check_url_3() { HTTP_CODE=$(curl -o /dev/null --connect-timeout 3 -s -w "%{http_code}" $1) if [ $HTTP_CODE -eq 200 ]; then continue fi } for URL in $URL_LIST; do check_url_3 $URL check_url_3 $URL check_url_3 $URL echo "Warning: $URL Access failure!" done #------ #方法2:錯誤次數儲存到變數 for URL in $URL_LIST; do FAIL_COUNT=0 for ((i=1;i<=3;i++)); do HTTP_CODE=$(curl -o /dev/null --connect-timeout 3 -s -w "%{http_code}" $URL) if [ $HTTP_CODE -ne 200 ]; then let FAIL_COUNT++ else break fi done if [ $FAIL_COUNT -eq 3 ]; then echo "Warning: $URL Access failure!" fi done #------ #方法3:錯誤次數儲存到陣列 for URL in $URL_LIST;do NUM=1 unset FAIL_COUNT while [ $NUM -le 3 ]; do HTTP_CODE=$(curl -o /dev/null --connect-timeout 3 -s -w "%{http_code}" $URL) if [ $HTTP_CODE -ne 200 ]; then FAIL_COUNT[$NUM]=$URL let NUM++ else break fi done if [ ${#FAIL_COUNT[@]} -eq 3 ];then echo "Warning: $URL Access failure!" fi done
10.檢查MySQL主從同步狀態
#!/bin/bash USER=bak PASSWD=123456 IO_SQL_STATUS=$(mysql -u$USER -p$PASSWD -e show slave statusG |awk -F: /Slave_.*_Running/{gsub(": ",":");print $0} ) #gsub去除冒號後面的空格 for i in $IO_SQL_STATUS; do THREAD_STATUS_NAME=${i%:*} THREAD_STATUS=${i#*:} if [ "$THREAD_STATUS" != "Yes" ]; then echo "Error: MySQL Master-Slave $THREAD_STATUS_NAME status is $THREAD_STATUS!" fi done
》》點選免費領取:2020持續更新Linux學習教程視訊實戰進階提升(學習路線+課程大綱+視訊教程+面試題+學習工具+大廠實戰手冊)