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高级 shell 脚本

棒锤_45f2 2022-06-21 阅读 160
hivebashsed编程语言

《Linux 命令行与 shell 脚本编程大全》


文章目录

  • ​​1. 编写简单的脚本实用工具​​
  • ​​1.1 自动备份​​
  • ​​1.1.1 按日备份​​
  • ​​1.1.2 按小时归档​​
  • ​​1.2 管理用户账户​​
  • ​​1.3 检测磁盘空间​​
  • ​​2. 电子邮件脚本​​
  • ​​3. 一些小有意思的脚本​​
  • ​​3.1 发送消息​​
  • ​​3.2 获取格言​​
  • ​​3.3 编造借口​​

1. 编写简单的脚本实用工具

1.1 自动备份

1.1.1 按日备份

可以借助配置文件，将需要备份的目录列出：

jiaming@jiaming-VirtualBox:~/Documents$ cat ./archive/Files_To_Backup 
/home/jiaming/Documents/emaillist.txt 
/home/jiaming/Desktop/vim/tags
jiaming@jiaming-VirtualBox:~/Documents$ cat Daily_archive.sh 
#!/bin/bash 

# gather current date
DATE=$(date +%y%m%d)

# set archive file name
FILE=archive$DATE.tar.gz

# set configuration and destination file
CONFIG_FILE=~/Documents/archive/Files_To_Backup
DESTINATION=~/Documents/archive/$FILE

# check backup config file exists

if [ -f $CONFIG_FILE ]
then
  echo
else
  echo
  echo "$CONFIG_FILE does not exit."
  echo "Backup not completed due to missing configuration file."
  echo
  exit
fi 

# buile the names of all the files to backup
FILE_NO=1 # start on line 1 of config file
exec < $CONFIG_FILE # redirect std input to name of config file

read FILE_NAME

while [ $? -eq 0 ]
do
  # make sure the file or directory exits.
  if [ -f $FILE_NAME -o -d $FILE_NAME ]
  then
    # if file exits, add its name to the list.
    FILE_LIST="$FILE_LIST $FILE_NAME"
  else
    # if file doesn't exit, issue warning
    echo
    echo "$FILE_NAME, doesn't not exit."
    echo "Obviously, I will not include it in this archive."
    echo "It is listed on line $FILE_NO of the config file."
    echo "Continuing to build archive list..."
    echo
  fi
  FILE_NO=$[$FILE_NO + 1] # increase line/file number by one.
  read FILE_NAME # read next record
done

echo "Starting archive..."
echo

tar -czf $DESTINATION $FILE_LIST 2> /dev/null 

echo "Archive completed"
echo "Resulting archive file is: $DESTINATION"
echo

exit

1.1.2 按小时归档

不必将所有归档文件都放到同一目录中，可以为归档文件创建一个目录层级。月的序号作为目录名，每月的目录中又包含了当月各天对应的目录。


base month 01 day 01 day 02 month 02 

#!/bin/bash 
CONFIG_FILE=~/Documents/archive/hourly/Files_To_Backup
BASEDEST=~/Documents/archive/hourly

DAY=$(date +%d)
MONTH=$(date +%m)
TIME=$(date +%k0%M)

mdkir -p $BASEDEST/$MONTH/$DAY 

DESTINATION=$BASEDEST/$MONTH/$DAY/archive$TIME.tar.gz

# ...

1.2 管理用户账户

删除账户的四个步骤：

  1. 获得正确的待删除用户账户名；
  2. 杀死正在系统上运行的属于该账户的进程；
  3. 确认系统中属于该账户的所有文件；
  4. 删除该用户账户；
jiaming@jiaming-VirtualBox:~/Documents$ bash Delete_User.sh 
Step #1 - Determine User Account name to Delete 


Please enter the username of the user
account you wish to delete from system: user008 

Is user008 the user account
you wish to delete from the system? [y/n] y

I found this record:
user008:x:1008:1008::/home/aoko:/bin/bash

Is this the correctrrect User Account [y/n] y

Step #2 - Find process on system belonging to user account

There are no processes for this account currently running.


Step #3 - Find files on system belonging to user account

Creating a report of all files owned by user008

It is recommended that you backup/archive these files,
and then do one of two things:
  1) Delete the files
  2) Change the files' ownership to a current user account.

Please wait. This may take a while...

Report is complete.
Name of report: user008_Files_210207.rpt
Location of report: /home/jiaming/Documents


Step #4 - Remove user account


Remove user008's account from system? [y/n] y
userdel: Permission denied.
userdel: cannot lock /etc/passwd; try again later.

User account, user008, has been removed

jiaming@jiaming-VirtualBox:~/Documents$ cat Delete_User.sh 
#!/bin/bash 
function get_answer {
  unset ANSWER
  ASK_COUNT=0
  while [ -z "$ANSWER" ]
  do
    ASK_COUNT=$[ $ASK_COUNT + 1 ]

    case $ASK_COUNT in
    2)
      echo
      echo "Please answer the question."
      echo
      ;;
    3)
      echo 
      echo "One last try...please answer the question."
      echo
      ;;
    4)
      echo
      echo "Since you refuse to answer the question..."
      echo "exiting program."
      echo

      exit 
      ;;
  esac
  
  echo

  if [ -n "$LINE2" ]
  then
    echo $LINE1
    echo -e $LINE2" \c"
  else
    echo -e $LINE1" \c"
  fi

  read -t 60 ANSWER
done

unset LINE1
unset LINE2
} # end of get_answer function

function process_answer {
  case $ANSWER in
    y|Y|YES|yes|Yes|yEs|yeS|YEs|yES)
      #If your answers "yes", do nothing  
      ;;
    *)
      # If user answers anything but "yes", exit script
      echo
      echo $EXIT_LINE1
      echo $EXIT_LINE2
      echo
      exit
      ;;
  esac

  # Do a little variable clean-up

  unset EXIT_LINE1
  unset EXIT_LINE2
} # End of process_answer function

echo "Step #1 - Determine User Account name to Delete "
echo
LINE1="Please enter the username of the user "
LINE2="account you wish to delete from system:"
get_answer
USER_ACCOUNT=$ANSWER

# Double check with script user that this is the correct User Account 

LINE1="Is $USER_ACCOUNT the user account "
LINE2="you wish to delete from the system? [y/n]"
get_answer

# Call program function:
# if user answers anything but "yes", exit script

EXIT_LINE1="Because the account, $USER_ACCOUNT, is not "
EXIT_LINE2="the one you wish to delete, we are leaving the script..."
process_answer

# check that USER_ACCOUNT is really an account on the system

USER_ACCOUNT_RECORD=$(cat /etc/passwd | grep -w $USER_ACCOUNT)

if [ $? -eq 1 ] # If the account is not found, exit script
then
  echo
  echo "Account, $USER_ACCOUNT, not found. "
  echo "Leaving the script..."
  echo
  exit
fi

echo
echo "I found this record:"
echo $USER_ACCOUNT_RECORD

LINE1="Is this the correctrrect User Account [y/n]"
get_answer

EXIT_LINE1="Because the account, $USER_ACCOUNT, is not."
EXIT_LINE2="the one you wish to delete, we are leaving the script..."
process_answer

# search for any running processes that belong to the User Account

echo
echo "Step #2 - Find process on system belonging to user account"
echo

ps -u $USER_ACCOUNT >/dev/null # are user processes running

case $? in
  1)
    # No processes running for this User Account
    echo "There are no processes for this account currently running."
    echo
    ;;
  0)
    # processes running for this User account.
    # Ask script User if wants us to kill the processes.

    echo "$USER_ACCOUNT has the following processes running: "
    echo
    ps -u $USER_ACCOUNT

    LINE1="Would you like me to kill the process(es)? [y/n]"
    get_answer

    case $ANSWER in
      y|Y|YES|yes|Yes|yEs|yEs|yeS|YEs|yEs)
        echo
        echo "Killing off process(es)..."
        
        # List user processes running code in variable, COMMAND_1
        COMMAND_1="ps -u $USER_ACCOUNT --no-heading"

        # Create command to kill processs in variable, COMMAND_3
        COMMAND_3="xargs -d\\n /usr/bin/sudo /bin/kill -9"

        # Kill processes via piping commands together
        $COMMAND_1 | gawk '{print $1}' | $COMMAND_3

        echo
        echo "Process(es) killed."
        ;;
      *)
        # If user answers anything but "yes", do not kill.
        echo
        echo "Will not kill the process(es)"
        echo
        ;;
    esac
    ;;
esac

# create a report of all files owned by User Account
echo
echo "Step #3 - Find files on system belonging to user account"
echo
echo "Creating a report of all files owned by $USER_ACCOUNT"
echo
echo "It is recommended that you backup/archive these files,"
echo "and then do one of two things:"
echo "  1) Delete the files"
echo "  2) Change the files' ownership to a current user account."
echo
echo "Please wait. This may take a while..."

REPORT_DATE=$(date +%y%m%d)
REPORT_FILE=$USER_ACCOUNT"_Files_"$REPORT_DATE".rpt"

find / -user $USER_ACCOUNT > $REPORT_FILE 2>/dev/null 

echo
echo "Report is complete."
echo "Name of report: $REPORT_FILE"
echo "Location of report: $(pwd)"
echo

# Remove User Account
echo
echo "Step #4 - Remove user account"
echo
LINE1="Remove $USER_ACCOUNT's account from system? [y/n]"
get_answer

# Call process_answer function:
# if user answers anything but "yes", exit script

EXIT_LINE1="Since you do not wish to remove the user account,"
EXIT_LINE2="$USER_ACCOUNT at this time, exiting the script..."
process_answer

userdel $USER_ACCOUNT
echo
echo "User account, $USER_ACCOUNT, has been removed"
echo

exit

1.3 检测磁盘空间

​​du​​​ 命令能够显示出单个文件和目录的磁盘使用情况。​​-s​​ 选项用来总结目录一级的整体使用情况。

jiaming@jiaming-VirtualBox:~/Documents$ sudo du -s /home/jiaming/Documents/
12756 /home/jiaming/Documents/
jiaming@jiaming-VirtualBox:~/Documents$ sudo du -s /home/*
4 /home/aoko
4 /home/byf
4 /home/djy
148140  /home/jiaming
4 /home/lhb
4 /home/lhm
4 /home/sj
2520  /home/wxc
4 /home/yx

jiaming@jiaming-VirtualBox:~/Documents$ sudo du -s /var/log/*
8 /var/log/alternatives.log
40  /var/log/alternatives.log.1
364 /var/log/apt
8 /var/log/auth.log
84  /var/log/auth.log.1
4 /var/log/boot.log
56  /var/log/bootstrap.log
0 /var/log/btmp
0 /var/log/btmp.1
32  /var/log/cups
4 /var/log/dist-upgrade
384 /var/log/dpkg.log
1288  /var/log/dpkg.log.1
8 /var/log/faillog
8 /var/log/fontconfig.log
4 /var/log/gdm3
4 /var/log/gpu-manager.log
8 /var/log/hp
724 /var/log/installer
73756 /var/log/journal
0 /var/log/kern.log
852 /var/log/kern.log.1
40  /var/log/lastlog
4 /var/log/speech-dispatcher
32  /var/log/syslog
180 /var/log/syslog.1
44  /var/log/syslog.2.gz
44  /var/log/syslog.3.gz
76  /var/log/syslog.4.gz
192 /var/log/syslog.5.gz
184 /var/log/syslog.6.gz
12  /var/log/tallylog
244 /var/log/unattended-upgrades
4 /var/log/vboxadd-install.log
4 /var/log/vboxadd-setup.log
4 /var/log/vboxadd-setup.log.1
4 /var/log/vboxadd-setup.log.2
4 /var/log/vboxadd-setup.log.3
4 /var/log/vboxadd-setup.log.4
4 /var/log/vboxadd-uninstall.log
24  /var/log/wtmp
12  /var/log/wtmp.1
52  /var/log/Xorg.0.log
52  /var/log/Xorg.1.log

​​-S​​ 选项为每个目录和子目录分别提供了总计信息。

jiaming@jiaming-VirtualBox:~/Documents$ sudo du -S /var/log/
73752 /var/log/journal/4e099a704ede4a4aa9a20f35bf22f7c8
4 /var/log/journal
364 /var/log/apt
244 /var/log/unattended-upgrades
4 /var/log/dist-upgrade
724 /var/log/installer
4 /var/log/gdm3
4 /var/log/hp/tmp
4 /var/log/hp
32  /var/log/cups
4 /var/log/speech-dispatcher
3720  /var/log/

排序：

jiaming@jiaming-VirtualBox:~/Documents$ sudo du -S /var/log/ | sort -rn
73752 /var/log/journal/4e099a704ede4a4aa9a20f35bf22f7c8
3720  /var/log/
724 /var/log/installer
364 /var/log/apt
244 /var/log/unattended-upgrades
32  /var/log/cups
4 /var/log/speech-dispatcher
4 /var/log/journal
4 /var/log/hp/tmp
4 /var/log/hp
4 /var/log/gdm3
4 /var/log/dist-upgrade
jiaming@jiaming-VirtualBox:~/Documents$ sudo du -S /var/log/ | 
> sort -rn | 
> sed '{11, $D; =}' | 
> sed 'N; s/\n/ /'  |
> gawk '{printf $1 ":" "\t" $2 "\t" $3 "\n"}'
1:  73752 /var/log/journal/4e099a704ede4a4aa9a20f35bf22f7c8
2:  3720  /var/log/
3:  724 /var/log/installer
4:  364 /var/log/apt
5:  244 /var/log/unattended-upgrades
6:  32  /var/log/cups
7:  4 /var/log/speech-dispatcher
8:  4 /var/log/journal
9:  4 /var/log/hp/tmp
10: 4 /var/log/hp
jiaming@jiaming-VirtualBox:~/Documents$ cat Big_Users.sh 
#!/bin/bash 

CHECK_DIRECTORIES=" /var/log /home" # Directories to check 

DATE=$(date '+%m%d%y')

exec > disk_space$DATE.rpt

echo "Top Ten Disk Space Usage"
echo "for $CHECK_DIRECTORIES Directories"

for DIR_CHECK in $CHECK_DIRECTORIES
do
  echo ""
  echo "The $DIR_CHECK Directory:"

  # Create a listing of top ten disk space users in this dir 
  du -S $DIR_CHECK 2>/dev/null |
    sort -rn |
    sed '{11, $D; =}' |
    sed 'N; s/\n/ /'  |
    gawk '{printf $1 ":" "\t" $2 "\t" $3 "\n"}'
done

exit
Top Ten Disk Space Usage
for  /var/log /home Directories

The /var/log Directory:
1:  73752 /var/log/journal/4e099a704ede4a4aa9a20f35bf22f7c8
2:  3724  /var/log
3:  724 /var/log/installer
4:  364 /var/log/apt
5:  244 /var/log/unattended-upgrades
6:  32  /var/log/cups
7:  4 /var/log/speech-dispatcher
8:  4 /var/log/journal
9:  4 /var/log/hp/tmp
10: 4 /var/log/hp

The /home Directory:
1:  36948 /home/jiaming/.cache/mozilla/firefox/ecbxuag8.default-release/cache2/entries
2:  19500 /home/jiaming/.cache/mozilla/firefox/ecbxuag8.default-release/startupCache
3:  13672 /home/jiaming/.mozilla/firefox/ecbxuag8.default-release/storage/permanent/chrome/idb
4:  13360 /home/jiaming/.mozilla/firefox/ecbxuag8.default-release
5:  12488 /home/jiaming/Documents/bin
6:  4496  /home/jiaming/.mozilla/firefox/ecbxuag8.default-release/security_state
7:  3156  /home/jiaming/.local/share/Trash/files/vim/sqlite
8:  3156  /home/jiaming/Desktop/vim/sqlite
9:  2004  /home/jiaming/.local/share/Trash/files
10: 1560  /home/jiaming/.cache/gnome-software/icons

2. 电子邮件脚本

sudo apt-get install mailutils
sudo apt-get install sendmail
sudo apt-get install Mailx

​​mail [-eIinv] [-a header] [-b addr] [-c addr] [-b subj] to-addr​​

参数

描述

-a

指定额外的 SMTP 头部行

-b

给消息增加一个 BCC:收件人

-c

给消息增加一个 CC:收件人

-e

如果消息为空，不要发送消息

-i

忽略 TTY 中断信号

-I

强调 Mailx 以交互模式运行

-n

不要读取 /etc/mail.rc 启动文件

-s

指定一个主题行

-v

在终端上显示投递细节

jiaming@jiaming-VirtualBox:~$ echo "This is a test message" | mailx -s "Test message" user001
user001@jiaming-VirtualBox:~$ mail
"/var/mail/user001": 1 message 1 new
>N   1 jiaming            一 2月  8 13:1  15/631   Test message
? 
Return-Path: <jiaming@jiaming-VirtualBox>
Received: from jiaming-VirtualBox (localhost [127.0.0.1])
  by jiaming-VirtualBox (8.15.2/8.15.2/Debian-10) with ESMTP id 1185Fu8R017659
  for <user001@jiaming-VirtualBox>; Mon, 8 Feb 2021 13:15:56 +0800
Received: (from jiaming@localhost)
  by jiaming-VirtualBox (8.15.2/8.15.2/Submit) id 1185FuCC017651;
  Mon, 8 Feb 2021 13:15:56 +0800
Date: Mon, 8 Feb 2021 13:15:56 +0800
From: jiaming <jiaming@jiaming-VirtualBox>
Message-Id: <202102080515.1185FuCC017651@jiaming-VirtualBox>
Subject: Test message
To: <user001@jiaming-VirtualBox>
X-Mailer: mail (GNU Mailutils 3.4)

This is a test message
jiaming@jiaming-VirtualBox:~$ cat factmail.sh 
#!/bin/bash 
# mailing the answer to a factorial

MAIL=$(which mailx)
factorial=1
counter=1

read -p "Enter the number: " value
while [ $counter -le $value ]
do
  factorial=$[$factorial * $counter]
  counter=$[$counter + 1]
done

echo The factorial of $value is $factorial | $MAIL -s "Factorial answer" $USER
echo "The result has been mailed to you.":
jiaming@jiaming-VirtualBox:~$ bash factmail.sh 
Enter the number: 6
The result has been mailed to you.:
jiaming@jiaming-VirtualBox:~$ mail
"/var/mail/jiaming": 1 message 1 new
>N   1 jiaming            一 2月  8 13:2  15/638   Factorial answer
? 1
Return-Path: <jiaming@jiaming-VirtualBox>
Received: from jiaming-VirtualBox (localhost [127.0.0.1])
  by jiaming-VirtualBox (8.15.2/8.15.2/Debian-10) with ESMTP id 1185PL1H017732
  for <jiaming@jiaming-VirtualBox>; Mon, 8 Feb 2021 13:25:21 +0800
Received: (from jiaming@localhost)
  by jiaming-VirtualBox (8.15.2/8.15.2/Submit) id 1185PLU2017729;
  Mon, 8 Feb 2021 13:25:21 +0800
Date: Mon, 8 Feb 2021 13:25:21 +0800
From: jiaming <jiaming@jiaming-VirtualBox>
Message-Id: <202102080525.1185PLU2017729@jiaming-VirtualBox>
Subject: Factorial answer
To: <jiaming@jiaming-VirtualBox>
X-Mailer: mail (GNU Mailutils 3.4)

The factorial of 6 is 720
jiaming@jiaming-VirtualBox:~$ cat diskmail.sh 
#!/bin/bash 
# sending the current disk statistics in an e-mail message

date=$(date +%m/%d/%Y)
MAIL=$(which mailx)
TEMP=$(mktemp tmp.XXXXXX)

df -k > $TEMP
cat $TEMP | $MAIL -s "Disk stats for $date" $1
rm -f $TEMP
jiaming@jiaming-VirtualBox:~$ mail
"/var/mail/jiaming": 1 message 1 new
>N   1 root               一 2月  8 13:3  40/2364  Disk stats for 02/08/2021
? 1
Return-Path: <root@jiaming-VirtualBox>
Received: from jiaming-VirtualBox (localhost [127.0.0.1])
  by jiaming-VirtualBox (8.15.2/8.15.2/Debian-10) with ESMTP id 1185YR3j01
7791
  for <jiaming@jiaming-VirtualBox>; Mon, 8 Feb 2021 13:34:27 +0800
Received: (from root@localhost)
  by jiaming-VirtualBox (8.15.2/8.15.2/Submit) id 1185YRbs017790;
  Mon, 8 Feb 2021 13:34:27 +0800
Date: Mon, 8 Feb 2021 13:34:27 +0800
From: root <root@jiaming-VirtualBox>
Message-Id: <202102080534.1185YRbs017790@jiaming-VirtualBox>
Subject: Disk stats for 02/08/2021
To: <jiaming@jiaming-VirtualBox>
X-Mailer: mail (GNU Mailutils 3.4)

Filesystem     1K-blocks    Used Available Use% Mounted on
udev             4052620       0   4052620   0% /dev
tmpfs             815352    1568    813784   1% /run
/dev/sda1       10253588 6046504   3666516  63% /
tmpfs            4076756       0   4076756   0% /dev/shm
tmpfs               5120       4      5116   1% /run/lock
tmpfs            4076756       0   4076756   0% /sys/fs/cgroup
/dev/loop2          2560    2560         0 100% /snap/gnome-calculator/826
/dev/loop1         56832   56832         0 100% /snap/core18/1944
/dev/loop0         91264   91264         0 100% /snap/core/8268
/dev/loop3          4352    4352         0 100% /snap/gnome-calculator/544
/dev/loop4           384     384         0 100% /snap/gnome-characters/570
/dev/loop5          3840    3840         0 100% /snap/gnome-system-monitor/127
/dev/loop7          1024    1024         0 100% /snap/gnome-logs/81
/dev/loop8        166784  166784         0 100% /snap/gnome-3-28-1804/145
/dev/loop9         66432   66432         0 100% /snap/gtk-common-themes/1514
/dev/loop10       164096  164096         0 100% /snap/gnome-3-28-1804/116
/dev/loop11        46080   46080         0 100% /snap/gtk-common-themes/1440
/dev/loop12         2304    2304         0 100% /snap/gnome-system-monitor/148
/dev/loop13        15104   15104         0 100% /snap/gnome-characters/399
/dev/loop15       100352  100352         0 100% /snap/core/10583
/dev/loop14         1024    1024         0 100% /snap/gnome-logs/100
/dev/loop16        56832   56832         0 100% /snap/core18/1988
tmpfs             815348      28    815320   1% /run/user/121
tmpfs             815348      36    815312   1% /run/user/1000
/dev/sr0           59206   59206         0 100% /media/jiaming/VBox_GAs_6.1.12
? q
Saved 1 message in /home/jiaming/mbox
Held 0 messages in /var/mail/jiaming

3. 一些小有意思的脚本

3.1 发送消息

启动消息功能：​​mesg y​​​​who -T​​高级 shell 脚本_sed
消息状态已经变成了加号，表明她可以接收他人的消息了。

高级 shell 脚本_sed_02
使用 write 命令通过其他登录用户的用户名和当前终端向其发送信息。

高级 shell 脚本_sed_03
高级 shell 脚本_sed_04

jiaming@jiaming-VirtualBox:~/Documents$ bash mu.sh user001 Hello user001, biu...user001 is not logged on.
Exiting script...
jiaming@jiaming-VirtualBox:~/Documents$ cat mu.sh 
#!/bin/bash 

# save the username parameter
muser=$1

# determine if user is logged on:
logged_on=$(who | grep -i -m 1 $muser | gawk '{print $1}')

if [ -z $logged_on ]
then
  echo "$muser is not logged on."
  echo "Exiting script..."
  exit 
fi

# determine if user allows messaging:

allowed=$(who -T | grep -i -m 1 $muser | gawk '{print $2}')

if [ $allowed != "+" ]
then
  echo "$muser does not allowing messaging."
  echo "Exiting script..."
  exit
fi

# determine if a message was included:

if [ -z $2 ]
then
  echo "No message parameter included."
  echo "Exiting script..."
  exit
fi

# determine if there is more to the message.

shift

while [ -n "$1" ]
do
  whole_message=$whole_message' '$1
  shift
done

# send message to user

uterminal=$(who | grep -i -m 1 $muser | gawk '{print $2}')

echo $whole_message | write $logged_on $uterminal

exit

3.2 获取格言

jiaming@jiaming-VirtualBox:~/Documents$ bash get_quote.sh 
jiaming@jiaming-VirtualBox:~/Documents$ cat /tmp/daily_quote.txt 
jiaming@jiaming-VirtualBox:~/Documents$ cat get_quote.sh 
#!/bin/bash 

quote_url=www.quotationspage.com/qotd.html

check_url=$(wget -nv --spider $quote_url 2>&1)

if [[ $check_url == *error404* ]]
then
  echo "Bad web address"
  echo "$quote_url invalid"
  echo "Exiting script..."
  exit 
fi

# Download web site's information
wget -o /tmp/quote.log -O /tmp/quote.html $quote_url

# extract the desired data

sed 's/<[^>]*//g' /tmp/quote.html |
  grep "$(date +%B' '%-d,' '%Y)" -A2 |
  sed 's/>//g' |
  sed '/&nbsp;/{n ; d}' |
  gawk 'BEGIN{FS="NBSP;"} {print $1}' |
  tee /tmp/daily_quote.txt > /dev/null 

exit

3.3 编造借口

使用 curl 工具，以及提供免费 SMS 消息发送服务的网站（http://textbelt.com/text），这个网站允许你每天发送最多 75 条短信。

curl http://textbelt.com/text \
-d number=YourPhoneNumber \
-d "message=Your Text Message"
jiaming@jiaming-VirtualBox:~/Documents$ cat send_txt.sh 
#!/bin/bash 

phone="xxxx"
SMSrelay=http://textbelt.com/text 
text_message="System Code Red"

curl -s $SMSrelay -d \
  number=$phone \
  -d "message=$text_message" > /dev/null 

exit


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