shellLearning

#!/bin/bash
echo "Hello World !"
# 注释内容
chmod +x ./test.sh  #使脚本具有执行权限
./test.sh  #执行脚本

your_name="qinjx"   # 定义变量
for file in `ls /etc`  # 定义变量2

echo $your_name
echo ${your_name}   #加括号为了方便识别

vairable=$(command)  #命令的执行结果赋值给变量

readonly your_name  #定义变量只读
unset your_name  # 删除变量

#!/bin/bash
url="http://c.xinbaoku.com"
website1='新宝库：${url}'
website2="新宝库：${url}"
echo $website1  #新宝库：${url}
echo $website2  #新宝库：http://c.xinbaoku.com

your_name="runoob"
greeting_1="hello, ${your_name} !"  #字符串拼接
echo ${#greeting_1} #输出 字符串长度

url="c.xinbaoku.com"
echo ${url: 2: 9}   #biancheng

#!/bin/bash

nums=(29 100 13 8 91 44)
echo ${nums[@]}  #输出所有数组元素
nums[10]=66  #给第10个元素赋值（此时会增加数组长度）
echo ${nums[*]}  #输出所有数组元素
echo ${nums[4]}  #输出第4个元素

echo ${#nums[*]}   #获取数组长度
#向数组中添加元素
nums[10]="http://c.xinbaoku.com/shell/"
echo ${#nums[@]}
echo ${#nums[10]}
#删除数组元素
unset nums[1]
echo ${#nums[*]}

#!/bin/bash

array1=(23 56)
array2=(99 "http://c.xinbaoku.com/shell/")
array_new=(${array1[@]} ${array2[*]})   #数组拼接

echo ${array_new[@]}  #也可以写作 ${array_new[*]}

funWithParam(){
    echo "第一个参数为 $1 !"
    echo "第二个参数为 $2 !"
    echo "第十个参数为 $10 !"
    echo "第十个参数为 ${10} !"
    echo "第十一个参数为 ${11} !"
    echo "参数总数有 $# 个!"
    echo "作为一个字符串输出所有参数 $* !"
}
funWithParam 1 2 3 4 5 6 7 8 9 34 73

#!/bin/bash
#得到两个数相加的和
function add(){
    return `expr $1 + $2`
}
add 23 50  #调用函数
echo $?  #获取函数返回值

#!/bin/bash

read age    # test 和 []  用法

if test $age -le 2; then
    echo "婴儿"
elif test $age -ge 3 && test $age -le 8; then
    echo "幼儿"
elif [ $age -ge 9 ] && [ $age -le 17 ]; then
    echo "少年"
elif [ $age -ge 18 ] && [ $age -le 25 ]; then
    echo "成年"
elif test $age -ge 26 && test $age -le 40; then
    echo "青年"
elif test $age -ge 41 && [ $age -le 60 ]; then
    echo "中年"
else
    echo "老年"
fi

echo $((++a))  #如果++在a的前面，输出整个表达式时，先进行自增或自减计算，因为a为9，且要自增1，所以输出10。

a=10 b=35
let a+=6 c=a+b  #多个表达式以空格为分隔
echo let a+b  #错误，echo会把 let a+b作为一个字符串输出

# if-else 结构 
if test $[num1] -eq $[num2]
then
    echo '两个数字相等!'
else
    echo '两个数字不相等!'
fi
# for-循环结构
for loop in 1 2 3 4 5
do
    echo "The value is: $loop"
done
#while 循环结构
while(( $int<=5 ))
do
    echo $int
    let "int++"
done
# util 循环结构
until [ ! $a -lt 10 ]
do
   echo $a
   a=`expr $a + 1`
done
#case 结构
echo '你输入的数字为:'
read aNum
case $aNum in
    1)  echo '你选择了 1'
    ;;
    2)  echo '你选择了 2'
    ;;
    3)  echo '你选择了 3'
    ;;
    4)  echo '你选择了 4'
    ;;
    *)  echo '你没有输入 1 到 4 之间的数字'
    ;;
esac

#break-continue 结构
while :
do
    echo -n "输入 1 到 5 之间的数字: "
    read aNum
    case $aNum in
        1|2|3|4|5) echo "你输入的数字为 $aNum!"
        ;;
        *) echo "你输入的数字不是 1 到 5 之间的!"
            continue
            echo "游戏结束"
        ;;
    esac
done

today=`date +%y%m%d`
ls /usr/bin -al > log.$today

#超时计数输入
if read -t 5 -p "Please enter your name:" name
then
	echo "Hello, $name, welcome to my script"
else
	#起到换行的作用
	echo
	#输入计数 -n1
	read -n1 -p "Do you want to continue [Y/N]?" answer
	case $answer in
	Y | y) echo
		   echo "Fine, continue on...";;
	N | n) echo
		   echo "OK，goodbye";;
	*) echo
	   echo "OK, wrong, goodbye"
	esac
	echo "Sorry, this is the end of the script"
fi

#从文件中读取数据
count=1
cat test | while read line
do
	echo "Line $count: $line"
	count=$[ $count + 1 ]
done
echo "Finished processing the file"

echo this is a line. | grep -E -o "[a-z]*\."

echo -e "1\n2\n3\n4" | grep -v -E "[1-2]"

#!/bin/sh
ps -fe|grep processString |grep -v grep   #管道命令
if [ $? -ne 0 ]
then
echo "start process....."
else
echo "runing....."
fi

#!/bin/bash
if [ $# -eq 1 ]
then
PROC_NAME="$1"
echo "server name:"${PROC_NAME}
num=`ps -ef | grep "${PROC_NAME}" | grep -v "grep" | grep -v "bash" | wc -l `
pidvar=`ps x | grep "${PROC_NAME}" | grep -v "grep" | grep -v "bash" | awk '{print $1}'`
echo $num
if [ $num -gt 0 ]
then
echo $pidvar
fi
else
echo "语法错误，正确语法如下:"
echo "getpidparam.sh process_name"
fi

#!/bin/sh
echo "`date`"
echo "Start $0---------"
echo ""
#每十秒监视一下
sec=10
#取得指定进程名为mainAPP，内存的使用率，进程运行状态，进程名称
eval $(ps | grep "mainApp" | grep -v grep | awk {'printf("memInfo=%s;myStatus=%s;pName=%s",$3,$4,$5)'})
echo $pName $myStatus $memInfo
testPrg=""
while [ -n "$pName" -a "$myStatus" != "Z" ]
do
    echo "----------`date`---------------------"
    echo $pName $myStatus $memInfo
    sleep $sec
    ####You must initialize them again!!!!!
    pName=""
    myStatus=""
    memInfo=""
    eval $(ps | grep "mainApp" | grep -v grep | awk {'printf("memInfo=%s;myStatus=%s;pName=%s",$3,$4,$5)'})
    testPrg=`ps | grep "MyTester" | grep -v grep | awk '{print $0}'`
    if [ -z "$testPrg" ]; then
        break
    fi
    ##注意一定要再次初始化为空
    testPrg=""
done
echo "End $0---($pName,$myStatus,$testPrg)-------------------"
if [ -z "$pName" ]; then
        ###发现测被测试程序异常退出后，停止测试程序
    killall MyTester
    echo "stop TestProgram MyTester"
fi
echo "`date`"
echo "---------------Current Status------------------"
ps | grep -E "mainApp|SubApp" | grep -v grep
echo ""

#!/bin/bash 
function information 
{ 
  echo "---------------------------"
  echo "图书馆管理系统（5.4版本）"
  echo 
  echo -n "| " ;echo "1:添加图书"
  echo -n "| " ;echo "2:删除图书"
  echo -n "| " ;echo "3:图书列表"
  echo -n "| " ;echo "4:查找图书"
  echo -n "| " ;echo "5|q:退出系统"
  echo 
  echo "---------------------------"
  read -p "请输入你的选择:" a 
    
  
  case "$a" in
  1) 
    add ;; 
  2) 
    delete ;; 
  3) 
    list ;; 
  4) 
    search;; 
  5|q|Q) 
    return -1 ;; 
  *) 
    information ;; 
  esac 
} 
  
  
function file_exist 
{ 
  if [ ! -f .book.txt ];then
    touch .book.txt 
  fi
} 
  
  
function add 
{ 
  read -p "请输入图书的编号：" number 
  read -p "请输入图书的书名：" book_name 
  read -p "请输入图书的作者：" author 
  read -p "请输入图书的价格：" price  
    echo -e "$number\t$book_name\t$author\t$price" >>.book.txt && { 
      echo "添加图书成功！"
      echo "-------------------"
    } 
  if [ $? -ne 0 ];then
    echo "添加图书失败"
  fi
  information 
  
} 
  
function delete 
{ 
  read -p "请输入要删除的图书的编号：" number 
  grep $number .book.txt &>/dev/null && { 
      sed -i '/\<'$number'\>/d' .book.txt &>/dev/null && 
      echo "删除图书成功" 
  echo "-------------------------"
  } 
    
  if [ $? -ne 0 ];then
    echo "删除图书失败"
    echo "你要删除的图书不存在"
  fi
  information 
} 
  
#列出所有图书的信息 
function list 
{ 
  echo -e "编号\t书名\t作者\t价格"
  cat .book.txt 
  echo "----------------------------"
  information 
    
} 
  
  
#下面的函数用到的查询菜单 
function search_menu 
{ 
  echo;echo "----------------------------" 
  echo -n "|";echo -e "1：\t按图书编号查询"
  echo -n "|";echo -e "2：\t按图书书名查询"
  echo -n "|";echo -e "3：\t按图书作者查询"
  echo -n "|";echo -e "4：\t按图书价格查询"
  echo -n "|";echo -e "5|q：\t退出查询系统"
  echo;echo "----------------------------" 
  
} 
function search 
{ 
  search_menu 
  read -p "请输出你的选择：" myselect 
  case "$myselect" in
  1) 
    read -p "请输入要查询的图书的编号：" mynumber 
    echo -e "编号\t书名\t作者\t价格\n"
    awk '$1=='$mynumber'{print $0}' .book.txt 2>/dev/null 
                
    if [ $? -ne 0 ];then
      echo "图书不存在"
    fi
    search 
    ;; 
  2) 
    read -p "请输入你要查询的书名：" mybook_name 
    echo -e "编号\t书名\t作者\t价格\n"
    awk '$2~/'$mybook_name'/{print $0}' .book.txt 2>/dev/null
    if [ $? -ne 0 ];then
      echo "图书不存在"
    fi
    search 
    ;; 
  3) 
    read -p "请输入图书的作者：" myauthor 
    echo -e "编号\t书名\t作者\t价格\n"
    awk '$3~/'$myauthor'/{;print $0}' .book.txt 2>/dev/null
    if [ $? -ne 0 ];then
      echo "图书不存在"
    fi
    search 
    ;; 
  4) 
    read -p "请输入图书的价格：" myprice 
    echo -e "编号\t书名\t作者\t价格\n"
    awk '$4=='$myprice'{print $0}' .book.txt 2>/dev/null
    if [ $? -ne 0 ];then
      echo "图书不存在"
    fi
    search 
    ;; 
  5) 
    information 
    ;; 
  *) 
    information 
    ;; 
  esac 
  
}