[Svc]shell Script

I will regularly collect some good shell and PY scripts to see here, for reference learning:

Shell resources:
Https://github.com/lannyMa/ops_doc/tree/master/LazyManage

Check Help

• Chinese Culture sh

yum install man-pages-zh-CN -yecho 'LANG="zh_CN.UTF-8"' >> ~/.bashrcecho 'LANGUAGE="zh_CN:zh"' >> ~/.bashrcsource ~/.bashrc

• Shell Auto-complete

  yum install bash-com*

• View shell Options

man sh

Script error exiting

set -ue 遇到错误退出    -x debug模式

Generating sequences

{2..10}seq 10for ((i=0,i<10;i++));do donefor i in `ls /`;do    echo ${i}_$(date +%F)done

Determine if a variable exists

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

Mathematical operations

$[$a+$b]

Monitor network card Traffic (number of packets/bytes)

#!/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 1done

Determine the number of parameters

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 $1else    echo "very sad"fi

Determine if execution parameters and directories exist

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

set -eecho "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 1else    JENKINS_INPUT_JOB_LIST=$1    if [ ! -f "$JENKINS_INPUT_JOB_LIST" ]    then        echo "ERROR File not found: $JENKINS_INPUT_JOB_LIST"        exit 1    fifi

[Svc]shell Script