Shell Exercises (ii)

Exercise 1: Counting Memory usage

Requirements: Write a script that calculates the amount of memory that is consumed by all processes in the Linux system. (Hint: use PS or top command)

Reference Answer:

#!/bin/bash# date:2018 February 6 # using top to calculate Echo-n "top statistics:"; top-bn1|sed ' 1,7 ' D|awk ' {(sum=sum+$6)}; END {print sum} ' # uses PS to calculate echo-n "PS statistic result:";p s aux|grep-v ' RSS ' |awk ' {(sum=sum+$6)}; END {print sum} ' # use for loop sum=0for men in ' ps aux|grep-v ' RSS ' |awk ' {print $6} ' do sum=$[$sum + $men]doneecho "(PS) the tot Al memory is $sum "K"

Exercise 2: Designing a Monitoring script

requirements: design a script that monitors the surviving state of a remote machine (assuming IP 123.23.11.21) and sends a message to yourself when it finds an outage

tip:  1. You can use the ping command    PING-C10 192.168.139.128
            2. The e-mail script can refer to mail.py
            3. The script can be turned into a dead loop, every 30s detection

Reference Answer:

#!/bin/bash# date:2018 February 6 ip= "192.168.139.128" email= "[email protected]" while:d o ping-c10 $ip >/dev/null 2>/de V/null if [$?-ne "0"];thenpython/root/shell/mail.py "$email" "$ip Down" "$ip are down ..." elseecho "Mail send fail! "Fisleep 30done

Mail Script mail.py

#!/usr/bin/env python#-*- coding: utf-8 -*-import os,sysreload (SYS) Sys.setdefaultencoding (' UTF8 ') import getoptimport smtplibfrom email. Mimetext import mimetextfrom email. Mimemultipart import mimemultipartfrom  subprocess import *def sendqqmail ( username,password,mailfrom,mailto,subject,content):    gserver =  ' smtp.163.com '     gport = 25    try:         msg = mimetext (Unicode (content). Encode (' Utf-8 '))          msg[' from '] = mailfrom        msg[' to '] =  mailto        msg[' reply-to '] = mailfrom         msg[' Subject '] = subject         smtp  = smtplib. SMTP (gserver, gport)         smtp.set_debuglevel (0)          smtp.ehlo ()         smtp.login ( Username,password)         smtp.sendmail (mailfrom, mailto,  Msg.as_string ())         smtp.close ()     except  Exception,err:        print  "send mail failed.  error: %s " % errdef main ():    to=sys.argv[1]     subject=sys.argv[2]    content=sys.argv[3]    sendqqmail (' [Email  protected] ', ' email Authorization Code ', ' [email protected] ', to,subject,content) if __name__ ==  "__main__ ":     main ()

Shell Exercises (ii)