Introduction to Shell Scripting
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quick introduction to the C# team to linux shell scripting and to the benefits of using it
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Introduction to Shell Scripting
- 2. Jeremie Charlet 10 06 2015 Introduction to Shell Scripting
- 3. Introduction Why use the shell? (copy/paste from “Why automate?” slide from “Getting Started with Puppet - PuppetConf 2013” https://www.youtube.com/watch?v=TdAmAj3eaFI) •Speed •Consistency •To get to fun things 3
- 4. PLAN Demonstration and quick displays of code on the following topics: 1.Start simple: analyse some logs 2.Write your own scripts 3.Reuse your scripts to do automation
- 5. 5 1. Start simple: to analyse logs Read the logs of one batch application •Find out if there are any errors •List the document ids in error Check whether those documents exists in the collection
- 6. 6 Useful commands Ls Echo wc -l Cat / more / less touch Vi / vim / emacs Grep / egrep / zgrep Find Awk Sed Cut Xargs Host Wget Curl Watch ps Mongo Java Mysql git
- 7. 7 2. Write scripts From simple naïve scripts: To more complex stuff:
- 8. 8 A few hints • Add colours to your shell • If you do something frequently……. …… write a script • Get the job done, do not polish it, you will get to it on next time
- 9. 9 Happy Consequences • You do not prevent yourself from writing scripts because it is going to take ages • You progress and learn gradually, over time • You stop looking for big tools, you answer simple needs with simple solutions > Example: Monitoring tool for daily updates on categories
- 10. 10 3. Reuse your scripts to do automation Sample with the Monitoring tool Cron (scheduled task) ran every day Script to monitor: monitorDailyUpdates.sh Dependencies: • checkDailyUpdates.sh • sendMail.sh
- 11. 11
Editor's Notes
- Retrieve all document references that could not be processed in taxonomy batch application. grep "document could not be processed because it was not found in the index" /tmp/processQueueMessages.log | awk '{print $19}' | cut -c -7 | sort | uniq grep "document could not be processed because it was not found in the index" /tmp/processQueueMessages.log | awk '{print $19}'| sed "s/,//g" | head -3 | xargs -I {} curl --silent "http://localhost:8985/solr/IAVIEWS_SNAPSHOT/select?q=DOCREFERENCE%3A{}" | egrep "(numFound|DOCREFERENCE)"
- sendMail.sh “email@department.gov.uk" "Untagged Docs on series WO 185" "$(echo "$(cat untaggedDocsOnSeries-WO_185-20150605.json)" | awk ' {print $0"<br/>"}')“