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 Ubuntu
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…
Install byobu Ubuntu Precise
To fix the infinite scrolling issue with byobu and Ubuntu precise install it the following way: apt-get install byobu echo “at the next prompt select ‘screen’ as the backend” byobu-select-backend
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…
How to Send Mail From Ubuntu Precise
Configuration To send mail from the command line in Ubuntu Precise sudo apt-get install mailutils If you mess up configuring or want to reconfigure dpkg-reconfigure mailutils Sending your test email Let’s send a test email! echo “test email body” |…
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…
restart service over ssh
I recently ran in to trouble restarting neo4j over ssh here’s the fix: From machine calling neo4j host ssh -f $USER@$HOST ‘sh -c “( (nohup sudo restart 2>&1 >output.file </dev/null) & )”‘ Target Machine Sudoers Replace “someuser” with whatever…
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…
Download a Single File from Amazon S3
How can we easily download a single file from Amazon S3? Install s3cmd apt-get install ipset Setup s3cmd s3cmd –configure List your buckets and files s3cmd ls Download your file s3cmd get s3://bucket-name//file-name