[svc]shell脚本

我会定期的把看到的一些好的shell和py脚本搜集在这里,供参考学习:

shell资源:
https://github.com/lannyMa/ops_doc/tree/master/LazyManage

查帮助

• 中文化sh

yum install man-pages-zh-CN -y
echo 'LANG="zh_CN.UTF-8"' >> ~/.bashrc
echo 'LANGUAGE="zh_CN:zh"' >> ~/.bashrc
source ~/.bashrc

• shell自动补全

  yum install bash-com*

• 查看shell选项

man sh

脚本出错退出

set -ue 遇到错误退出
    -x debug模式

生成序列

{2..10}
seq 10
for ((i=0,i<10;i++));do done

for i in `ls /`;do
    echo ${i}_$(date +%F)
done

判断变量是否存在

man sh
-z  如果变量值长度为0,则为真

-d
-f
-w 可写
-x 可执行   --启动脚本是否可执行
-e 是否存在.--配置文件是否存在

数学运算

$[$a+$b]

监控网卡流量(数据包个数/字节数)

#!/usr/bin/env bash


#/sys/class/net/eth0/statistics/rx_packets: 收到的数据包数据
#/sys/class/net/eth0/statistics/tx_packets: 传输的数据包数量
#/sys/class/net/eth0/statistics/rx_bytes: 接收的字节数
#/sys/class/net/eth0/statistics/tx_bytes: 传输的字节数
#/sys/class/net/eth0/statistics/rx_dropped: 当收到包数据包下降的数据量
#/sys/class/net/eth0/statistics/tx_dropped: 传输包数据包下降的数据量


function get_pkgs(){
    rx_packets=$(cat /sys/class/net/eth0/statistics/rx_packets)
    tx_packets=$(cat /sys/class/net/eth0/statistics/tx_packets)
    rx_bytes=$(cat /sys/class/net/eth0/statistics/rx_bytes)
    tx_bytes=$(cat /sys/class/net/eth0/statistics/tx_bytes)

    rx_kb=$[$rx_bytes/1024/1024]
    tx_kb=$[$tx_bytes/1024/1024]
}

function print(){
    get_pkgs
    echo -n "数据包/收: ";
    echo -n "数据包/发: ";
    echo -n "数据包/发-字节: "${rx_kb} Mb;
    echo -n "数据包/收-字节: "${tx_kb} Mb;
    sleep 1
}

while :;do
    print
    echo
    sleep 1
done

判断参数个数

function help(){
    echo "usage: xxx
          this is a test
    "
}

# 参数总数
#if [ $# -eq 0 ];then
#    help
#elif [ $1 == "22" ];then
#    echo "22 happy"
#else
#    echo "default..."
#fi

# 参数是否存在
if [ ! -z "$1" ];then
    echo $1
else
    echo "very sad"
fi

判断执行参数和目录是否存在

参考: https://github.com/jenkinsci/docker/blob/master/plugins.sh

set -e

echo "WARN: plugins.sh is deprecated, please switch to install-plugins.sh"

if [ -z "$1" ]
then
    echo "
USAGE:
  Parse a support-core plugin -style txt file as specification for jenkins plugins to be installed
  in the reference directory, so user can define a derived Docker image with just :
  FROM jenkins
  COPY plugins.txt /plugins.txt
  RUN /usr/local/bin/plugins.sh /plugins.txt
  Note: Plugins already installed are skipped
"
    exit 1
else
    JENKINS_INPUT_JOB_LIST=$1
    if [ ! -f "$JENKINS_INPUT_JOB_LIST" ]
    then
        echo "ERROR File not found: $JENKINS_INPUT_JOB_LIST"
        exit 1
    fi
fi