README_Shubh.md

Bandit_level.1-level.15_solutions

0-1.

to login in ssh server at hostname and port as user

ssh <user>@<hostname> -p <port>

1-2.

to work with dashed files use ‘<-’ instead of ’-’

cat <-

2-3.

to use , use escape sequence <space>

cat spaces\ in\ this\ filename

3-4. to check hidden files in directory

ls -a

4-5.

check file type of all files , ascii files will be human readable .

 Cd inhere
 File inhere/\*

File dir/* prints all file types in dir directory

5-6.

to find a file of size x bytes in y dir (c for bytes)

find y -size xc

here,

find / -size 1033c

6-7.

find -user <username> -group <groupname> -size 33c

7-8.

use grep to search within files

grep -F <pattern> <filename>

-F for fixed string pattern

8-9.

use diff by piping two stdout as stdin

diff --normal <(sort -R data.txt | uniq --all-seperated -) <(sort -R data.txt | uniq -u -)

can only use uniq -u with sorted files

9-10.

use grep to match output with at least == pattern after piping stdout from strings function ,strings will print all human readable characters

strings data.txt | grep == -

10-11.

decode the given base64 encoded data

base64 -d data.txt

11-12.

use translate -t giving range as array set taking input from data.txt file , in default case it translates characters from set1 to set 2

tr -t [A-Za-z] [N-ZA-Mn-za-m] < data.txt

12-13.

first, retrieve the compressed file from hexdump file,
then decompress repeatedly using bzip2, gzip, tar

for reverse hexdump,
xxd -r data\_copy.txt > data0.txt

data0.txt is a compressed file of gzip, bzip2, tar which is checked by file command ,then rename file using mv to add appropriate suffix like gz, bz2

gzip -d data0.txt.gz
bzip2 -d data0.txt.bz2

13-14.

since private key is already generated and given as file, to use private key for ssh server use -i tag

ssh -i <filename> <user>@<hostname> -p <port>

14-15.

path for password is given in prev level, so we have to just transfer data between two ports on the localhost, using nc we check for the status of the ports 2220 (source) and 30000 (destination)

nc -l localhost 2220 output: already in use

nc -l localhost 30000 output: already in use

to send password string to port 30000 of localhost

(use <<<’’ for string and < for file )

nc localhost 30000 <<< ‘<password for level14>’