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Bash One-Liners

A collection of various moderate to very complex one-liners I use occasionally. I have a collection of various Bash commands here:

count number of lines, all files in a folder, sort

find . -type f -print0 | wc -l --files0-from=- | sort -n

replace line 5 in a text file

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Bash Scripting Cheatsheet

This a collection of simple to advanced scripting techniques for Bash.

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#!/bin/bash

# update apt-get
export DEBIAN_FRONTEND="noninteractive"
sudo apt-get update

# remove previously installed Docker
sudo apt-get purge lxc-docker*
sudo apt-get purge docker.io*

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#!/bin/bash

# rotate ALL users, including yourself
# allUsers=$(aws iam list-users --output text | cut -f 6);

# read from a file, one username per line
# preferably set their username to their email address
allUsers=$(cat ./user-names.txt);

for userName in $allUsers; do

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print all 255 ASCII characters in hex

for x in range(255): print hex(x),

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diff --git a/ext/json/ext/fbuffer/fbuffer.h b/ext/json/ext/fbuffer/fbuffer.h
index af74187..9524fb1 100644
--- a/ext/json/ext/fbuffer/fbuffer.h
+++ b/ext/json/ext/fbuffer/fbuffer.h
@@ -172,7 +172,7 @@ static FBuffer *fbuffer_dup(FBuffer *fb)

 static VALUE fbuffer_to_s(FBuffer *fb)
 {
-    VALUE result = rb_str_new(FBUFFER_PAIR(fb));
+    VALUE result = rb_str_new(FBUFFER_PTR(fb), FBUFFER_LEN(fb));

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Buffer Overflow Tutorial

This tutorial is based on the Computerphile video, made by Dr. Mike Pound

https://www.youtube.com/watch?v=1S0aBV-Waeo

The tutorial will show you how to trigger and exploit a buffer overflow attack against a custom C program, using Kali Linux 32-bit PAE 2016.1.

Torrent Link: https://images.offensive-security.com/virtual-images/Kali-Linux-2016.1-vbox-i686.torrent

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Make sure you are running an HTTP proxy on 127.0.0.1:8080 I suggest Burpsuite, Free Edition: https://portswigger.net/burp/download.html

I wrote this in Bash, not because it was easy, but because it was fast. This script lets you max out your CPU and network resources far better than Burpsuite, or a stand-alone python script, by taking advantage of the parallel program, and the many decades of C code optimization that's gone into Bash and GnuUtils.

[enumerate_url.sh]

#!/bin/bash

curlJsonEnum(){

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[nmap_scanner.sh]

#!/bin/bash

# create the output directory
mkdir ./nmap_scan

# loop over each ending ip octet

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MongoDB Cheatsheet

Setup

installation, Ubuntu

https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10