Show HN: Oops I deleted my bin/ dir

#1

Post by jarv » Wed, Jul 22, 2020, 9:11 AM UTC

Show HN: Oops I deleted my bin/ dir
oops.cmdchallenge.com

Re: Show HN: Oops I deleted my bin/ dir

#2

Post by jarv » Wed, Jul 22, 2020, 9:23 AM UTC

Hello HN: This is a a modification to an old side-project that explores what is possible when you are left with a shell and no utilities on a Linux machine.

Re: Show HN: Oops I deleted my bin/ dir

#3

Post by cerberusss » Wed, Jul 22, 2020, 2:15 PM UTC

Great fun! As a non-native speaker, I was confused by the "Print its contents" exercise. I tried things involving /dev/lpr.

Re: Show HN: Oops I deleted my bin/ dir

#4

Post by jarv » Wed, Jul 22, 2020, 2:30 PM UTC

cerberusss wrote: post #3

Great fun! As a non-native speaker, I was confused by the "Print its contents" exercise. I tried things involving /dev/lpr.

thanks for the feedback, maybe something like "display its contents" would be clearer.

Re: Show HN: Oops I deleted my bin/ dir

#5

Post by KMnO4 » Wed, Jul 22, 2020, 2:31 PM UTC

Very cool! I was a bit confused with the marking criteria. For example, my solution for "list all files on one line" appears to work correctly but is said to be incorrect.

    shopt -s dotglob; for i in *; do echo -n "$i "; done

EDIT: I now see that the correct answer is simply "`echo *`". Despite having a dotfile in the directory, it should not be shown.

Re: Show HN: Oops I deleted my bin/ dir

#6

Post by cerberusss » Wed, Jul 22, 2020, 2:37 PM UTC

jarv wrote: post #4

cerberusss wrote: post #3

Great fun! As a non-native speaker, I was confused by the "Print its contents" exercise. I tried things involving /dev/lpr.

thanks for the feedback, maybe something like "display its contents" would be clearer.

Yeah that sounds clear. Awesome puzzle game, very educational.

Re: Show HN: Oops I deleted my bin/ dir

#7

Post by jarv » Wed, Jul 22, 2020, 2:39 PM UTC

KMnO4 wrote: post #5

Very cool! I was a bit confused with the marking criteria. For example, my solution for "list all files on one line" appears to work correctly but is said to be incorrect. shopt -s dotglob; for i in *; do echo -n "$i "; done EDIT: I now see that the correct answer is simply "`echo *`". Despite having a dotfile in the directory, it should not be shown.

Ah, that is a bug the dotfile should not be there. Thanks!

Re: Show HN: Oops I deleted my bin/ dir

#8

Post by Jaruzel » Wed, Jul 22, 2020, 2:55 PM UTC

jarv wrote: post #2

Hello HN: This is a a modification to an old side-project that explores what is possible when you are left with a shell and no utilities on a Linux machine.

It's not really that educational tbh. I am not a bash guru, nor do I wish to be one, so the second question left me cold with no desire to proceed any further.

It's a fun game for those with the skills, but an instructional tool it is not.

Re: Show HN: Oops I deleted my bin/ dir

#9

Post by dexen » Wed, Jul 22, 2020, 3:11 PM UTC

Very amusing - and brings back memories of when a friend actually did remove the /bin (and IIRC the /lib64) a couple months ago :-)

Getting stuck on #/oops_print_file_contents - the command times out. Not sure if I'm missing a better solution or perhaps the server is overloaded

The command I tried was (here protected with rot13):

zncsvyr sbbone --

A mild irritant is that the usual ^W (delete word to the left) instead closes tab in Firefox. Perhaps this could be prevented...?

Re: Show HN: Oops I deleted my bin/ dir

#10

Post by heavenlyblue » Wed, Jul 22, 2020, 3:25 PM UTC

Jaruzel wrote: post #8

jarv wrote: post #2

Hello HN: This is a a modification to an old side-project that explores what is possible when you are left with a shell and no utilities on a Linux machine.

It's not really that educational tbh. I am not a bash guru, nor do I wish to be one, so the second question left me cold with no desire to proceed any further. It's a fun game for those with the skills, but an instructional tool it is not.

It's an algebra game.

Given a set of operations, can you get to state X?

Usually requires a lot of searching and/or expertise, however the solutions will break pretty easily depending on which shell you're using, etc. So doesn't really teach you anything aside from iterating over a set of all possible operation combinations.