davidkarim

aws ec2 describe-instances --region us-east-1 | jq -r '.Reservations[].Instances[] | .InstanceId + " " + .State.Name + " " + .PublicIpAddress + " " + .Placement.AvailabilityZone + " " + .KeyName + " " + (.Tags[] | select(.Key == "Name") | .Value)'

davidkarim

#!/bin/bash

# Function to compare version numbers
version_gt() { test "$(echo "$@" | tr " " "\n" | sort -V | head -n 1)" != "$1"; }

# Check if the current directory is a git repository
if git rev-parse --git-dir > /dev/null 2>&1; then
    echo "Current directory is a git repository."
    # Find all subdirectories
    for dir in */ ; do

davidkarim

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x389E80",false],"id":1}' -H "Content-Type: application/json" http://localhost:8545

{"jsonrpc":"2.0","id":1,"result":{"baseFeePerGas":"0x73","difficulty":"0x0","extraData":"0x","gasLimit":"0x17d7840","gasUsed":"0x167820","hash":"0x6b46b1ada3465df628b382b74c22295eeb069ae5d7d5fed2297f1f44285f4ce6","logsBloom":"0x00040000200000000000080080000000000000042000000000002008100103800000000000000000000000000820004400000000000020000000100000200000000000402028000002010008060002000080040000040000020000000000000000040000020000028000004000000a100400100000084100000000100000001000000100004000000000000800000000000000000040044800000000204000000a0080000000400000000000000004000014008000000000000008000040000000200002200010010200000000020000004000000000101200005000000060000010200000000000080000000000000000010000000040000000800000000000","miner":"0x4200000000000000000000000000000000000011","mixHash":"0x3b1033a5d1e576afca1eee93524532756390dd41954cb3f746

davidkarim

Guessing game

Ask the gamer his name (store it in a varialbe).

The program needs to generate a random number between 1 and 20.

Ask the user to guess the number (user their name whenever you ask something; like: ok David, guess a number)

After each guess, say if the answer is higher or lower than what they guessed.

davidkarim

Reverse Shell on Raspberry Pi

Place the reverse_shell.py script in /home/pi/

Got to /etc/systemd/system and place the reverse_shell.service file there.

# Start the service
systemctl start reverse_shell.service
# Enalbe the service, to make sure it restarts when rebooting

davidkarim

REMIX EXAMPLE PROJECT

Remix example project is present when Remix loads very first time or there are no files existing in the File Explorer. 
It contains 3 directories:

1. 'contracts': Holds three contracts with different complexity level, denoted with number prefix in file name.
2. 'scripts': Holds two scripts to deploy a contract. It is explained below.
3. 'tests': Contains one test file for 'Ballot' contract with unit tests in Solidity.

SCRIPTS

davidkarim

array=("167.71.98.4" "159.89.41.47" "157.245.10.243" "64.225.3.62" "167.172.17.254")
#array=("159.89.41.47" "157.245.10.243")
username='test'
for i in ${array[@]}
do
  echo $i
  ssh -i ./ssh root@$i "adduser --disabled-password --gecos \"\" $username"
  ssh -i ./ssh root@$i "mkdir /home/$username/.ssh"
  scp -i ./ssh ./authorized_keys root@$i:/home/$username/.ssh/authorized_keys
done

davidkarim

FROM ubuntu:18.04

RUN apt-get update && apt-get install -y openssh-server
RUN mkdir /var/run/sshd
RUN chmod 0755 /var/run/sshd
COPY startup.sh /startup.sh

CMD /startup.sh

davidkarim

### Keybase proof

I hereby claim:

  * I am davidkarim on github.
  * I am davidkarim (https://keybase.io/davidkarim) on keybase.
  * I have a public key ASAIKuJMocub512vJJZ-KNTufkHm200JPyxVH3TRdmYaJgo

To claim this, I am signing this object:

davidkarim

# create bashvars.sh, chmod +x bashvars.sh
# call it with one or two arguments (i.e. ./bashvars.sh hi dude)
echo "The value you passed was $1"
if [ $1 = "hi" ]
then
  echo "Hi !"
elif [ $1 = "bye" ]
then
  echo "Goodbye !"
fi