[PHP知识库]shell脚本练习demo

test1.sh

#!/bin/bash

#注释
echo "begin test1.sh"
read -p "请输入num的值:" num
read data1 data2
echo "num=$num"
echo "num1=$1"
echo "num2=$2"
echo "data1=$data1"
echo "data2=$data2"
readonly num=1
echo "num=$num"
num=2
echo "num=$num"
echo "env_data=$LOGNAME"
echo "==================="
echo 'num=$num'
echo "参数的个数=$#"
echo "参数的内容=$*"
echo "第一个参数=$1"
echo "第二个参数=$2"
echo "第三个参数=$3"
echo "进程名=$0"
echo "进程ID=$$"
readonly num=2
num=3
echo "上一个命令的结果=$?"

test2.sh

#!/bin/bash
echo "begin test2.sh"
echo -e  "today is \n  `date`"
ls
num=10
(
    num=100
    echo "()num=$num"
)
echo "num1=$num"
{
    num=200
    echo "{}num=$num"
}
echo "num2=$num"
echo "=========变量的扩展"
#判断变量是否存在
echo ${num11:-100}
num11=200
echo ${num11:-100}

echo ${num22:=50}
echo "num22:=$num22"

str="haha:xixi:hehe"
echo "str的长度为：${#str}"
echo ${str/:/@}
#条件测试
read -p "请输入一个文件名" fileName
result=test -e $fileName
echo "result=$result"
[ -e $fileName ]
echo $?

test -z $sttr
echo $?
read -p "please input y/n:" sttr
[ -z sttr ]
echo "1:$?"
[ $sttr = "y" ]
echo "2:$?"
read -p "请输入第一个字符串" str1
read -p "请输入第二个字符串" str2
[ $str1 = $str2 ]
echo "3:$?"

read -p "first int num" int1
read -p "second int num " int2
[ $int1 -eq $int2 ]
result1=$?
echo "result1=$result1"
echo "命令执行控制====="
test 2 -lt 3 && test 5 -ne 6 && echo "&&success"
test "aaa" = "1" || test "22" = "22" || echo "||end"
test 3 -eq 3 -a 4 -eq 4

test3.sh

#!/bin/bash

if [ $1 -eq $2 ]; then
    echo '$1 is equal $2'
else 
    echo 'aaaa'
fi

read -p "请输入文件夹的名字：" folderName
if [ -e $folderName ]; then
    echo "$folderName 文件夹是存在的，即将进入文件夹"
    cd $folderName
    read -p "是否要创建文件：y/n： " yn
    if [ $yn = "y" ]; then
        read -p "please input file name: " fileName
        touch $fileName
        echo "create $fileName success"
    else 
        echo "ok, we'll not create file"
    fi
else 
    echo "this $folderName is not exist"
fi

test4.sh

#!/bin/bash

echo "case demo"
read -p "please input yes/no:  " yn
case $yn in
    yes | y* | Y*)
        echo "is yes"
        ;;
    no|n*|N*)
        echo "is no"
        ;;
    *)
        echo "is other"
        ;;
esac

echo "for demo"
declare -i sum=0
declare -i i=0
for (( i=0; i<=100; i++ ))
do
    sum=$sum+i
done
echo "sum=$sum"


echo "导入函数"
function my_max ()
{
    if [ $1 -gt $2 ]; then
        return $1;
    else 
        return $2
    fi
}

test5.sh

#!/bin/bash

source ./folder1/test4.sh
read -p "first data is: " data1
read -p "second data is: " data2
my_max $data1 $data2

echo "$data1和$data2的最大值是: $?"

test6.sh

#查看filename文件，如果存在，将标准输出（1）重定向到/dev/null(黑洞)，如果不存在，将报错信息标准错误（2）重定向到/dev/null,屏幕不输出内容
cat filename 1>>/dev/null 2>>/dev/null
echo $(date)" is env date" >>$(dirname $0)/testlog.txt
echo $?
==========================分割线===============
#!/bin/bash
# Copyright Huawei Technologies Co., Ltd. 2019-2020. All rights reserved.
#你写的每个脚本都应该在文件开头加上set -e（只能作用于当前脚本）,告诉bash如果任何语句的执行结果非0则应该退出。
#set -e 命令用法总结如下：
#1. 当命令的返回值为非零状态时，则立即退出脚本的执行。
#2. 作用范围只限于脚本执行的当前进程(. test.sh 这样执行的test.sh存在当前进程)，不作用于其创建的子进程(test.sh 这样是创建的子进程)。
#3. 另外，当想根据命令执行的返回值，输出对应的log时，最好不要采用set -e选项，而是通过配合exit 命令来达到输出log并退出执行的目的。
set -e
PROCESS_CMD="cloudcvengine-focusocr"
#$0 表示当前执行的命令
#readlink -f $0 找出当前脚本所在目录./start.sh（符号链接）找到真正的可执行文件，再用dirname取父目录路径
CUR_DIR="$(dirname $(readlink -f $0))"

#以进程名关键字"cloudcvengine-focusocr"、jar类型过滤找到进程并显示文件的行数wc -l
num=$(ps -ef | grep "${PROCESS_CMD}" | grep jar | grep -v grep | wc -l)

if [ $num -ne 0 ]; then
    #awk '{print $2}'  $fileName :   一行一行的读取指定的文件， 以空格作为分隔符，打印第二个字段
	#-F' '  ：规定以什么作为分隔符，这里表示的以' '空格
    pid=$(ps -ef | grep "${PROCESS_CMD}" | grep jar | grep -v grep | awk -F' ' '{print $2}')
    echo "focusocr tf service had been started, pid=${pid}"
	#exit -1/1 非正常运行导致退出shell脚本  exit 0 正常运行并退出脚本
    exit 0
fi

#cd .;pwd  获取当前脚本所在地绝对路径
SCRIPT_PATH=$(cd $(dirname $0);pwd)

#判断绝对路径上上级目录是否存在logs  不存在就-p递归创建目录
START_LOG_DIR=${SCRIPT_PATH}/../../logs/focusocr-service
if [ ! -d "${START_LOG_DIR}" ]; then
    mkdir -p ${START_LOG_DIR}
fi

cd ${SCRIPT_PATH}/..
#递归.目录为所有文件夹/文件在u(当前用户)赋予7(r+w+x：读+写+执行)的权限
chmod -R 700 .

WATCH_DOG=/

CUDA_HOME=/usr/local/cuda

JAVA_OPS="-Xms4096M -Xmx4096M -XX:NewRatio=1"

APP_ROOT=${SCRIPT_PATH}/..
bash ${APP_ROOT}/init.d/install_auto.sh

JAVA_OPTS="$JAVA_OPTS"

#为当前脚本设置环境变量
export SEC_RASP_CUSTOM_CONF=$APP_ROOT/conf/rasp

[[ ! -d $SEC_RASP_HOME ]] && SEC_RASP_HOME=/opt/huawei/secRASP
if [ -f "$SEC_RASP_HOME/slave_agent/bin/set_java_opts.sh" ]; then
	#引入其他脚本
    source $SEC_RASP_HOME/slave_agent/bin/set_java_opts.sh
fi

LD_LIBRARY_PATH=${CUDA_HOME}/lib64:./jni:$LD_LIBRARY_PATH java ${JAVA_OPTS} ${JAVA_OPS} -jar ${PROCESS_CMD}*.jar 2>>/dev/null >>/dev/null &
echo $(date)" Execute {$0} command!" >>${START_LOG_DIR}/start.log

sleep 1

num=$(ps -ef | grep "${PROCESS_CMD}" | grep jar | grep -v grep | wc -l)
if [ $num -ne 0 ]; then
    pid=$(ps -ef | grep "${PROCESS_CMD}" | grep jar | grep -v grep | awk -F' ' '{print $2}')
    echo "focusocr tf service has been starting, pid=${pid}"
else
    echo "focusocr tf service start failed, there is no such pid"
fi
if [[ $# -ne 1 || "$1" != "watchdog" ]]; then
    bash $CUR_DIR/../watchdog/bin/watchdog.sh start > /dev/null 2>&1
    bash $CUR_DIR/../watchdog/bin/watchdog.sh mon > /dev/null 2>&1
fi