plumbing

Information

Points	Category	Level
200	General Skills	Easy

Challenge

Sometimes you need to handle process data outside of a file. Can you find a way to keep the output from this program and search for the flag? Connect to 2019shell1.picoctf.com 57911.

Submit!

Hint

Remember the flag format is picoCTF{XXXX} What’s a pipe? No not that kind of pipe… This kind

Solution

To get the file we need to use the shell of the site so open this url In order to connect you need to enter your username and password. No to get the problem folder we need to go back 2 folders and then enter the problem folder so write:

cd ..
cd ..
cd /problems/first-grep--part-ii_0_b68f6a4e9cb3a7aad4090dea9dd80ce1/files

Now us ls to see what in the directory:

ls

So there are many directory in it, and many more in it’s and on and on and on… We really need to do grep in each folder?

There is an easy way to do grep search in recursive way (that way we will search in each inner folder).

The way to do that, it’s only include the -r flag in the grep command so let’s write:

grep -r 'picoCTF{'

And we got this:

files9/file26:picoCTF{grep_r_to_find_this_e4fa3ba7}

We found the flag and it’s in the files26 that in the files9 folder

Flag

picoCTF{grep_r_to_find_this_e4fa3ba7}

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