Shell Basics

This Repository is meant for learning and documenting Shell Lessons just like in Just Python

1. Create a bash file using standard linux editor vi.
2. Execute the following commands to open a file namely vi start_with_bash.bash.
3. Start with #!/usr/bin/bash as the first line. The significane of having this line as the first line tells the OS to invoke the specified shell to execute the commands that follow in the script. #! is often referred to as a "hash-bang", "she-bang" or "sha-bang".
4. Add a few lines as below.
5. Exit after saving using :wq. Change the script execution permissions using the command chmod u+x start_with_bash.bash.
6. Execute the script using the command ./start_with_bash.bash

#!/usr/bin/bash 

echo "Printing the script."

The following are the keywords which cannot be used for declaring variables.

1. read
2. echo
3. readonly
4. set
5. unset
6. shift
7. export
8. if
9. then
10. else
11. fi
12. elif
13. case
14. esac
15. break
16. continue
17. while
18. until
19. for
20. select
21. do
22. done
23. eval
24. trap
25. test
26. exec
27. sleep
28. wait
29. return
30. exit

	#!/usr/bin/bash 
	echo "A comment will follow after this line" # Here is the comment
	echo "A # here does not begin a comment" 
	echo A \# here does not begin a comment 
	echo The # here begins a comment 

As in the above scripts, anything after # is depricated. See the output on executing the above script.

A comment will follow after this line
A # here does not begin a comment
A # here does not begin a comment
The

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