Missing solutions to, context for, and files required by exercises

[gcapes]

Many of the exercises don't have solutions. Some don't need solutions because learners can run the commands and see which is the correct answer. In some of the exercises, the commands can't be tested because the data files don't exist e.g. 07-find, "matching and subtracting" - there are no *ose.dat files

The -v flag to grep inverts pattern matching, so that only lines which do not match the pattern are printed. Given that, which of the following commands will find all files in /data whose names end in ose.dat (e.g., sucrose.dat or maltose.dat), but do not contain the word temp?

find /data -name '*.dat' | grep ose | grep -v temp
find /data -name ose.dat | grep -v temp
grep -v "temp" $(find /data -name '*ose.dat')
None of the above.

Sometimes it isn't clear which directory the question refers to.

I plan to submit a series of PRs to address these issues, using existing files as much as possible. Is this of interest to others?

[shwina]

@gcapes - yes, of course! PRs addressing these issues are more than welcome.

[gcapes]

@shwina
See #520.
A bit of context for the latter part of this PR: I think it's very helpful for learners to be able to try the commands, rather than only having a mental exercise e.g. 05-loops/variables in loops

Suppose that ls initially displays...

It is for this reason that I'll be changing the exercises on this episode to use existing files, rather than providing solutions for the exercises as they currently stand.
Cheers

[gcapes]

@shwina
I've now finished submitting PRs to fix this issue:

• Fix #518 for 03-create #521
• Fix #518 for 04-pipefilter #522
• Fix #518 for 05 loop #526
• Fix #518 for 06-script #527
• Fix #518 for 07-find #528

I only had to add files for #528.

I see that #524 adds to #521, but #523 is a duplicate of one of the commits in #522.
Cheers

[shwina]

Thanks for all your contributions and for this summary @gcapes! I'll begin reviewing ASAP.

[gcapes]

Great, thanks!