企业实战:Shell编程的多元化案例分析

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"《Shell编程企业应用案例.pdf》是一份深入浅出的文档,它为企业级Shell编程提供了丰富的实战案例,通过详细的思考步骤和多种方法,帮助读者理解和掌握如何在实际工作中灵活运用Shell脚本。这份教程注重培养读者的多元化思维,使其在解决企业技术问题时能有独特的见解和解决方案。 书中首先介绍了Shell编程的基础概念,如bash shell脚本语言、命令行操作、常用工具如if-else、httpd、MySQL等的整合。通过实例演示,学习者可以学会如何配置Web服务器(如设置80/8080端口)、连接MySQL数据库,并利用netstat、ss、lsof等工具进行网络监听和资源管理。 在实战部分,作者详细讲解了如何使用`netstat`和`telnet`进行端口扫描,以及`nmap`和`nc`进行网络通信测试。例如,通过`mysql -u root -p`命令进行远程数据库查询,同时使用管道操作(`|`)结合`grep`和`wc-l`统计命令行输出结果,展示了一种高效的资源监控方法。 文档还涉及到网络安全相关的内容,如防止DDoS攻击,通过`yum`安装必要的安全工具,如`nc`,并利用`ss`和`lsof`检查特定端口的活动情况。此外,书中还演示了如何使用`ps-ef`和`grep`组合来查找特定进程,以及如何使用`wget`和`curl`下载网页资源。 整个案例涵盖了企业环境中常见的任务,如服务管理、数据查询、网络检测和安全防护,旨在让读者在解决实际工作中的问题时能熟练运用Shell编程技巧。通过这份资料,读者不仅能提升技术面试的表现,还能在日常工作中更加游刃有余地应对各种挑战。" 这份文档不仅适合想要提升Shell编程技能的专业人士,也适合对IT运维有兴趣的初学者,通过学习这些企业级的实战案例,能够大大提高自身的技术水平和问题解决能力。
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Shell脚本高级编程教程,希望对你有所帮助。 Example 10-23. Using continue N in an actual task: 1 # Albert Reiner gives an example of how to use "continue N": 2 # --------------------------------------------------------- 3 4 # Suppose I have a large number of jobs that need to be run, with 5 #+ any data that is to be treated in files of a given name pattern in a 6 #+ directory. There are several machines that access this directory, and 7 #+ I want to distribute the work over these different boxen. Then I 8 #+ usually nohup something like the following on every box: 9 10 while true 11 do 12 for n in .iso.* 13 do 14 [ "$n" = ".iso.opts" ] && continue 15 beta=${n#.iso.} 16 [ -r .Iso.$beta ] && continue 17 [ -r .lock.$beta ] && sleep 10 && continue 18 lockfile -r0 .lock.$beta || continue 19 echo -n "$beta: " `date` 20 run-isotherm $beta 21 date 22 ls -alF .Iso.$beta 23 [ -r .Iso.$beta ] && rm -f .lock.$beta 24 continue 2 25 done 26 break 27 done 28 29 # The details, in particular the sleep N, are particular to my 30 #+ application, but the general pattern is: 31 32 while true 33 do 34 for job in {pattern} 35 do 36 {job already done or running} && continue 37 {mark job as running, do job, mark job as done} 38 continue 2 39 done 40 break # Or something like `sleep 600' to avoid termination. 41 done 42 43 # This way the script will stop only when there are no more jobs to do 44 #+ (including jobs that were added during runtime). Through the use 45 #+ of appropriate lockfiles it can be run on several machines 46 #+ concurrently without duplication of calculations [which run a couple 47 #+ of hours in my case, so I really want to avoid this]. Also, as search 48 #+ always starts again from the beginning, one can encode priorities in 49 #+ the file names. Of course, one could also do this without `continue 2', 50 #+ but then one would have to actually check whether or not some job 51 #+ was done (so that we should immediately look for the next job) or not 52 #+ (in which case we terminate or sleep for a long time before checking 53 #+ for a new job).