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Mastering Linux Shell Scripting

You're reading from   Mastering Linux Shell Scripting A practical guide to Linux command-line, Bash scripting, and Shell programming

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Product type Paperback
Published in Apr 2018
Publisher
ISBN-13 9781788990554
Length 284 pages
Edition 2nd Edition
Languages
Tools
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Authors (2):
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Mokhtar Ebrahim Mokhtar Ebrahim
Author Profile Icon Mokhtar Ebrahim
Mokhtar Ebrahim
Andrew Mallett Andrew Mallett
Author Profile Icon Andrew Mallett
Andrew Mallett
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Table of Contents (17) Chapters Close

Preface 1. The What and Why of Scripting with Bash FREE CHAPTER 2. Creating Interactive Scripts 3. Conditions Attached 4. Creating Code Snippets 5. Alternative Syntax 6. Iterating with Loops 7. Creating Building Blocks with Functions 8. Introducing the Stream Editor 9. Automating Apache Virtual Hosts 10. AWK Fundamentals 11. Regular Expressions 12. Summarizing Logs with AWK 13. A Better lastlog with AWK 14. Using Python as a Bash Scripting Alternative 15. Assessments 16. Other Books You May Enjoy

Saying Hello World the Python way

The code we write in Python should be clear and uncluttered: sparse is better than dense. We will need the shebang on the first line and then the print statement. The print function includes the newline and we do not need semicolons at the end of the line. We can see the edited version of $HOME/bin/hello.py in the following example:

#!/usr/bin/python3
print("Hello World")

We will still need to add the execute permission, but we can run the code as earlier using chmod. This is shown in the following command but we should be a little used to this now:

$ chmod u+x $HOME/bin/hello.py

Finally, we can now execute the code to see our greeting.

Similarly, you can run the file using the Python interpreter from the command line like this:

$ python3 $HOME/bin/hello.py

Or in some Linux distributions, you can run it like this:

$ python36 $HOME/bin...
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