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…
Category Redhat Centos
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…
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…
Logstash Logrotate Howto
Problems I was facing two problems with my Logstash setup Logstash service constantly required manual restarts (no longer indexing, hanging process) Local log files were filling up my root partition Symptom Logstash failed to: Index events in the queue Trim…
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…
Testing SSL Chaining Issues
Recently I needed to debug an issue by testing SSL chaining issues My old standby tools (curl and openssl were not reporting any errors) The exception javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: Path does not chain with any of…
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 We have a few files there, specifically: * cidr_to_ipset.sh (a script to create an ipset ruleset) * Some example…
barnyard2 won’t log to database – how to fix it
What to do when barnyard2 won’t log to the database…. Are you seeing something like this? [SignatureReferencePullDataStore()]: No Reference found in database … Full text: # /usr/local/bin/barnyard2 -c -d /var/log/snort -f snort.log -w Running in Continuous mode –==…
egrep valid ip address
Example to egrep valid ip address To egrep all valid ip addresses in current directory: egrep -r ‘[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}’ . An Alternative: /bin/egrep ‘\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b’
neo4j SSL howto
Getting SSL to work with neo4j can be very frustrating. The crux of the problem is that their documentation isn’t very robust. Here’s what they don’t tell you: Both the cert and the key MUST be in DER format! example…