shell获取命令的返回值
res=`docker run -dti -v $rootdir:/monitor -v /etc/localtime:/etc/localtime:ro 86912afeeaa8 /bin/bash`
echo $res
echo "${res} container is running....."
字符串和变量拼接
imagedir="$rootdir/docker/escron.tar"
shell单双引号的区别
windows和linux平台兼容
用vi/vim命令打开脚本文件,输入“:set fileformat=unix”,回车,保存退出
写入单行文本和多行文本
单行文本
echo Hello > filename.txt
多行文本
cat>${shelldir}/hostcron.sh<<EOF
#! /bin/bash
docker exec ${res} /bin/bash /monitor/shell/crontbday.sh
echo $(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log
echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log \表示转义字符 后面的命令做为字符串写入到文件 而不是把命令的执行结果写入到文件 EOF
sed命令中使用变量
把命令中的单引号变成双引号
#sed -i 's/ip=.*/ip=10.10.10.10/' ${filedir}
sed -i "s/ip=.*/ip=$ip/" ${filedir}
实例代码
#! /bin/bash
#执行此脚本需要root用户权限
read -p "Enter your es server Ip, please: " ip
echo $ip
basedir=`cd $(dirname $0); pwd -P;`
rootdir=$(dirname $basedir)
echo "the root dir is $rootdir"
echo "setting the es server ip"
filedir="$rootdir/common/esConfig.py"
#sed -i 's/ip=.*/ip=${ip}/' ${filedir}
sed -i "s/ip=.*/ip=\"$ip\"/" ${filedir}
echo 'loadding docker images'
imagedir="$rootdir/docker/escron.tar"
echo "the image at ${imagedir}"
docker load -i $imagedir
echo "loadding docker image complete...."
echo 'run a docker container......'
res=`docker run -dti -v $rootdir:/monitor -v /etc/localtime:/etc/localtime:ro 86912afeeaa8 /bin/bash`
echo $res
echo "${res} container is running....."
shelldir="$rootdir/shell"
echo "update the containerID to the shell"
cat>${shelldir}/hostcron.sh<<EOF
#! /bin/bash
docker exec ${res} /bin/bash /monitor/shell/crontb.sh
echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msg.log
EOF
cat>${shelldir}/hostcronday.sh<<EOF
#! /bin/bash
docker exec ${res} /bin/bash /monitor/shell/crontbday.sh
echo \$(date "+%Y-%m-%d %H:%M:%S") >>${rootdir}/msgday.log
EOF
echo 'setting the system crontab'
echo "*/60 * * * * sh ${shelldir}/hostcron.sh" >> /var/spool/cron/root
echo "1 0 * * * sh ${shelldir}/hostcronday.sh" >> /var/spool/cron/root
echo "the task is success finished.....!"
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