WRITE BASH SCRIPTS for CTF Solutions (PicoCTF 08 'file-run1')

[@_JohnHammond]

Check out Snyk's Capture the Flag 101 Workshop! snyk.co/ctf101 (pssst, click the link. hey you. yeah you. click the link) (click it) (click the link) CLICK THE LINK

[@_AN203]

**Subliminal message** :/ Me : meh

[@StreamNexus]

Good for you by prefacing your experience and being honest. I’ve seen your videos and honestly I grumbled at some of the “easy” things you were talking about but that’s me being pretentious…keep it up!

[@StreamNexus]

You use push/pop d for when you are traversing frequently to multiple various, typical distant dirs, to keep a stack of paths. Usually useful for shell scripting in scenarios to shorthand running commands without having to rewrite cd /a/long/ass/path for working directories

[@willbill5684]

Sir how about start python series or JS series for writing own scripts for CTF it's gonna be real one heck of series and i can't wait for this one to start. Thanks.

[@ЯнДьяконов-е9м]

It's a workshop, but it's free. Sounds strange.

[@0xbitbybit]

Looks like we need you to do more crappy "challenges", loved the bash scripting side-quest! Super interesting and useful!

[@SuperSohaizai]

Just when I am planning to pick up bash scripting again, perfect timing. Thanks John!

[@CorporateMonk]

Fantastic demo, John! I've been looking for a practical demo of Bash scripting applied to CTF for awhile! Great job!

[@micleh]

This is your strong suit and shows your excellence as a KZbinr and educator: A challenge that seemed to be a trifle turned out to be a worth-while lesson.

[@darkivy7207]

I had a good laugh when you cracked that puzzle. Thanks for uploading it.

[@tobisdevelopercorner1190]

John, thank you for pointing out Snyk's workshop! Much appreciated!

[@seclilc]

Love how you made an entire video on this simple challenge and i learned a little something along the way!

[@Shad33]

The fumbling is why I love your channel. If the John Hammond fumbles then I shouldn't feel bad when I do lol

[@m4rt_]

it shows that he is human humans are not perfect

[@evenblackercrow4476]

Thank you. Helps me to learn linux, which makes everything I learn a CTF exercise.

[@zaviermiller8980]

genius concept, getting to learn unix and ctf at the same time very nice

[@marco201ful]

Your eyes seem tired but your voice show drive and motivation toward your content. Awesome work man. Hopefully I'll have the opportunity to meet you one day. Vegas local here!!

[@NoONE-bk7ud]

it's all about learning John

[@cruzalex9662]

Have really learnt alot from you Chief....am grateful

[@mjtonyfire]

Super excellent John, I've been thinking about the same problem lol

[@berthold9582]

J' ai besoin d'un prof comme toi John

[@duscraftphoto]

I love BASH and I love your content. This was a great display of how you can use BASH scripts to save so much time!

[@jeremirynkiewicz4913]

Very cool! Didn't know you could do cat file

[@CA-FE-C0-FF-EE-00]

Thanks... Found the video where you explained the scripts :) thank you so much for you videos, they are really motivating me and hyping me for the htb CTF on Saturday :)

[@greyether777]

Another informative vid. Always learning from you. Thanks so much for taking the time to make these John.

[@mossdem]

Ah another video I never knew I needed lol! Discovered I could use bash for a lot more than I knew. Learning a lot from your channel as always

[@azizutkuozdemir]

When u use bash, u have my hearth 💓

[@devonburelle400]

Great video! I'd love to see more bash scripting in the scope of cyber security!

[@nuridincersaygili]

You create your own challenge! So cook!

[@TheH2OWeb]

We love you too man !!!!

[@notme9801]

Awesome! I think I've found my new hobby

[@decoder6878]

Wonderful as always

[@andrecosta4979]

eheh you are awasome johnnyyy. "embarrassed to upload this" eheheh Keep the good work. I am big fan :)

[@m4rt_]

7:35 If you move a directory while inside it, you still kinda have it, but when you go out of it, it is gone. In Linux you can continue using something you deleted until you close it, and then it is gone

[@VA3KAMA3]

is it not dangerous in certain environments?

[@TechieGuy82]

Really super cool Thank you thumbs up

[@pranav9068]

Ik i am a beginner but using xxd to see the flag or run a binary to get the flag is a bit absurd The video helped me learn tho

[@mattkelly2938]

"I don't like saying that out loud." fucking dying!!!!

[@StreamNexus]

Me yelling…”cut”…”just use cut” “CUT” …I get way to into it

[@lancemarchetti8673]

Genius eyedear 😎

[@REDSPYTECH]

I love Bash script 😍

[@ancestrall794]

We love you too

[@cheikhdione2895]

Keep going 👏🏾

[@tonyitalia7798]

I try: file-run1 strings run | grep picoCTF file-run2 (you help me) strings run |grep -oE "picoCTF{.*}"

[@michaelhawthorn8254]

Hi John I am a complete noob to coding, is zsh another type of bash shell or language.

[@stumbling]

0:53 These poor people have been hacked! Look at the code writing itself on their screens! :O

[@steemycoinz]

good stuff

[@EricSchmeling]

Why you no chmod 755? 😊

[@josephseed3393]

whats that song at the end of your video?

[@c1chef206]

I'll be playing

[@m4rt_]

13:55 I wrote the exact same as you, but I couldn't get it to work also the history thing just ends up returning the command used to run the script

[@BristlyBright]

I encountered the same thing. history command returns itself as the last line. I found this to be the solution: history | tail -2 | head -1

[@m4rt_]

@@BristlyBright thanks, I'll try it later.

[@papsnap9724]

@@BristlyBright i use ubuntu and it solve the problem

[@MiguelDevOps]

W

[@EricSchmeling]

👍👍

[@danielbigombe3024]

The first flag was a big joke, I agree 😂

[@apozlevich]

So many comments and no mention of $PWD and $OLDPWD...

[@ashleydelgado-r7e]

"i dont like saying that out loud" lmaoooo

[@shyhotboy1352]

5:39 What did he say???

[@m4rt_]

can i pushd

[@ChrisLeftBlank]

Can i make a suggestion @yt-algorithms. When you refer someone to a video its polite to leave a link i think. Especially when its relevant. So next time you reference an already covered video - leave a link. Pl0x

[@errollgnargnar9534]

🧙‍♂️

[@masudrahman253]

Continue

[@ghm2188]

oHHHHHHHHHHHHHHh looooolll

[@hassenfadl990]

3:50 😂😂😂

[@bhagyalakshmi1053]

C,c++ details

[@vymvn6]

To be even more lazy, make a cron tab that checks the picoCTF sub directories for a “flag.txt” and it exists then it marks it done

[@_AN203]

Gosh no 😂😂😂😂😂😂😂 Really 😂😂😂

[@cyclops74air11]

You can love me all you want

[@tvathome562]

Lol pushd XD

[@StreamNexus]

Or read some Man-Pages and source code…oh yeah and stay off my lawn

[@bech2342]

don't be mad at me, but this video is a bit nonsense. looks like it was just to fill the video. i'm a bit disappointed.

[@m4rt_]

it was literally the point, he says it at the end

[@bech2342]

@@m4rt_ doesn't make it better

[@angz2717]

However it still has more sense then other type of 'content creator' videos

[@m4rt_]

@@bech2342 He is teaching us stuff, that's why you are watching this, right? to learn stuff. if not just leave the video after he completes the ctf challenge.

[@bech2342]

@@angz2717 I would never deny

[@lfcbpro]

pushd - slight snigger :P

[@JNET_Reloaded]

how av you not made a function or alias for chmod command yet? thats like the 1st thing i do on linux! lol i litrally use x instead of sudo chmod +x *.sh

[@m4rt_]

the ones I always do is alias ll="ls --color=auto -lha" alias rm="rm -i" alias cp="cp -i" alias mv="mv -i"