Bulk Lookup Owner of IP Address

To perform a bulk whois lookup of a list of IP addresses use the following script: Bulk whois lookup while read ip; do if [ ! -z "$ip" ]; then echo -n "$ip - " && whois $ip 2>/dev/null grep "Organization" -m 1; fi; done < ip_list.txt Example input (ip_list.txt) Output... » read more

Howto Use Roku at a Hotel

Using you Roku at a hotel can be problematic because you are unable to accept the terms of service when using the internet. This post explains how to use a Roku at a Hotel. These instructions can be followed pretty much verbatim for any other device (wii u, xbox, etc). Instructions Go to “Settings”, and... » read more

Add Current PATH to crontab

Add Current PATH to crontab Are you sick of your cron job failing because you are not explicitly listing the full path of everything in your shell script? Here’s how to fix it! Problem Your script works when you run it from the console but fails in cron. Cause Your crontab doesn’t have the right... » read more

self deleting bash script

How to create a bash script that deletes itself This script will delete itself via the shred command (secure deletion) when it exits #!/bin/bash # # Author: Steve Stonebraker # Date: August 20, 2013 # Name: shred_self.sh # Purpose: securely self-deleting shell script # http://brakertech.com/self-deleting-bash-script currentscript=$0 # function that is called when the script exits... » read more

Howto Add Hex Numbers via Command Line

Recently I needed to calculate the starting and ending memory addresses of an IOS application (in order to dump it). As a result i needed to figure out how to add two hex addresses. Here’s what I discovered. Basic Example In this case we are adding 0x4f000 and 0x2000 $ printf "0x%X\n" $(( 0x4f000+0x2000 ))... » read more

Bash Cheat Sheet

Here’s my bash cheat sheet: Tests Combining [ condition ] && action; # action executes if condition is true. [ condition ] || action; # action executes if condition is false. Filesystem related tests We can test different filesystem related attributes using different condition flags as follows: [ -f $file_var ]: Returns true if the... » read more

Whitelist Entire Country with ipset

Goal: Whitelist an Entire Country with ipset For this article i’ll be referencing the github repository I set up at https://github.com/ssstonebraker/braker-scripts/tree/master/working-scripts/ipset We have a few files there, specifically: * cidr_to_ipset.sh (a script to create an ipset ruleset) * Some example CIDR blocks for Italy (IT.txt), Spain (ES.txt), Great Britian (GB.txt), USA (US.TXT) * sample_firewall.txt (example... » read more

passing bash variable to perl command in bash script

Recently I tried passing a bash variable to perl command in bash script, it didn’t end well. Troy Engel from http://tacticalvim.wordpress.com/ was nice enough to point out the issue: use sed instead of perl for what you need; it’s simpler, faster and uses the bash variables easily. I set up a test script /home/someuser/test.sh to show:... » read more

sed delete all lines after

Objective: Prep dev httpd.conf for production Tasks: Remove jenkins virtual host entry (which starts with a comment line “#Start Jenkins”) Replace .dev with nothing (ex: www.dev.example.com becomes www.example.com) Replace debug with error (ex: Loglevel debug becomes Loglevel error) Sed to remove lines after match In this example we will use sed delete all lines after... » read more

redhat add multiple users

useradd script to add multiple users to a system and force them to change their password upon login try the following script: Redhat # for name in someuser anotheruser yetanotheruser; do useradd $name; echo 'password' | passwd --stdin $name; chage -d 0 $name; done The above script will add three users to the system (someuser... » read more