《Linux命令行与shell脚本编程大全》第二十六章 一些有意思的脚本

 xcy@xcy-virtual-machine:~/shell/26zhang$ cat mu.sh 
 #!/bin/bash
 muser=$1
 logged_on=$(who | grep -i -m 1 $muser | gawk '{print $1}')
  
 #1) determine if user is logged
 if [ -z $logged_on ]
 then
          echo "$muser is not logged on"
          echo "Exiting script......"
          exit
 fi
  
 #2) determine if user allows messages
 allowed=$(who -T | grep -i -m 1 $muser | gawk '{print $2}')
 if [ $allowed != "+" ]
 then
          echo "$muser does not allowing messageing."
          echo "Exiting script......"
          exit
 fi
  
 # 3) check message
 if [ -z $2 ]
 then
          echo "No message parameter included"
          echo "Exiting script......"
          exit
 fi
  
 shift
  
 while [ -n "$1" ]
 do
          whole_message=$whole_message' '$1
          shift
 done
  
 # 4) Send message to user
 uterminal=$(who | grep -i -m 1 $muser | gawk '{print $2}')
 echo $whole_message | write $logged_on $uterminal
 exit
 

 xcy@xcy-virtual-machine:~/shell/26zhang$ cat quota.sh 
 #!/bin/bash
 quote_url=www.quotationspage.com/qotd.html
 #quote_url=www.baidu.com
  
 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
  
 #wget -o /tmp/quote.log -O /tmp/quote.html $quote_url
 wget -o quote.log -O quote.html $quote_url
  
 sed 's/<[^>]*//g' quote.html | #去除<>
 #grep "$(date +%B' '%-d,' '%Y)" -A2 | #匹配格言中当前日期的右边。-A2选项提取出另外 两行文本
 grep "28, $(date +%Y)" -A2 | # xcy add
 sed 's/>//g' |  # 删除>
 sed '/&nbsp;/{n ; d}' |
 gawk 'BEGIN{FS="&nbsp;"} {print $1}' |
 tee daily_quote.txt > /dev/null #保存文件
 exit
 xcy@xcy-virtual-machine:~/shell/26zhang$ ./quota.sh 
 xcy@xcy-virtual-machine:~/shell/26zhang$ cat daily_quote.txt 
 Selected from Michael Moncur's Collection of Quotations - November 28, 2017
 Perpetual devotion to what a man calls his business, is only to be sustained by perpetual neglect of many other things. Robert Louis Stevenson (1850 - 1894) 
 xcy@xcy-virtual-machine:~/shell/26zhang$