I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
I think your numbering got eaten by the editor! Almost all the examples are number 1.
There's a syntax error in your example 9; it should be cp file-a file-b.
In your 8th example 1 , touch isn't a command to create a file - that's a side effect of its real purpose, and there are lots of commands which will incidentally create a file for you. More importantly (or pedantically?) you don't need to do it so it's something beginners don't need to learn.
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I think your numbering got eaten by the editor! Almost all the examples are number 1.
There's a syntax error in your example 9; it should be
cp file-a file-b.In your 8th example 1 ,
touchisn't a command to create a file - that's a side effect of its real purpose, and there are lots of commands which will incidentally create a file for you. More importantly (or pedantically?) you don't need to do it so it's something beginners don't need to learn.