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Rsync delete orphan files from target only - no copy

Calling rsync in the following way, using --existing, --ignore-existing and --delete allows the following:

• Files at target that do not exist at source will be deleted.
• Skip all file copy operations from source to target.

$ rsync \
 --delete \

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Nginx upstream HTTP keepalive config example

As per Nginx documentation, the key directives of proxy_http_version and proxy_set_header need to be set as per below:

upstream backend {
	server 127.0.0.1:8080;
	keepalive 8;
}

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Cancel Ubuntu Grub2 menu after failed boot/shutdown

Use the following values in /etc/default/grub:

GRUB_HIDDEN_TIMEOUT=2
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=0
GRUB_RECORDFAIL_TIMEOUT=2

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Escaping token replace values for sed

In this case replacement is passed in $1. Will replace TOKEN_NAME in given /path/to/my/templatefile.txt.

The magic is sed --regexp-extended 's/[\/&]/\\&/g' - ensures replace value is not tripped up in call to sed.

#!/bin/bash -e

tokenReplace=$1

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#!/bin/bash -e

LINE_BREAK="======================================"
REQUEST_HEADERS="Content-Type"
REQUEST_METHOD="GET"


function exitError {

	echo "Error: $1" >&2

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BIND - delegate a sub domain for a zone

The scenario:

• DNS zone myzone.com defined in BIND.
• Authoritative name server at 123.16.123.1.
• Subzone sub.myzone.com with an authoritative name server at 123.16.123.10.
• Wishing to forward sub-zone to authoritative name server.

Config

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Bash getopts template

• Example
• Reference

#!/bin/bash -e

function usage {
	cat <&2

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Keybase proof

I hereby claim:

• I am magnetikonline on github.
• I am magnetikonline (https://keybase.io/magnetikonline) on keybase.
• I have a public key whose fingerprint is FA4A B218 5B57 20B2 A93C C1E4 9C83 B9FB 627C 44B8

To claim this, I am signing this object:

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AWS Elastic Beanstalk deploy user restricted IAM policy

An IAM user policy document to give minimal rights for deploying an Elastic Beanstalk application.

Where:

• REGION: AWS region.
• ACCOUNT_ID: AWS account ID.
• APPLICATION_NAME: Desired target Elastic Beanstalk application name(space).
• IAM_INSTANCE_PROFILE_ROLE: The instance profile (IAM role) Elastic Beanstalk EC2 instaces will run under.

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#!/bin/bash

IFS=$'\n'
counter=1

for file in $(ls -1tr *.jpg); do
	mv "$file" "$(printf "img_%04d.jpg" "$counter")"
	counter=$(($counter + 1))
done