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Install The Silver Searcher (ag) on macOS from source

A quick n' dirty bash script to install the following:

• automake, pkg-config, PCRE, xz - all needed by ag configure.
• ag - from source.

Requires as a minimum Xcode CLI tools (don't need a full Xcode install). Can be done via the following:

$ xcode-select --install

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Golang net/http middleware flow

$ go run main.go
Called middleware03()
Called middleware02()
Called middleware01()
Called initial()

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Golang private modules within a GitHub organization

You've got Golang modules within a private repository or an organization and would like to go get them.

For this example the GitHub organization will be spacely-sprockets.

Howto

Set GOPRIVATE (ideally placed in your .bashrc / dotfiles):

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Find latest non beta/RC release for Docker CLI

Using curl and jq to:

• Pull list of GitHub release tags.
• Filter out all that don't match vX.Y.Z (stripping beta/rc).
• Finally return just the first entry (latest tag).

$ curl --silent \

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Creating a 'run once' systemd unit

Systemd unit template which calls a script exactly once upon startup and keeps unit status active after script finishes.

Unit file placed in /etc/systemd/system and enabled with:

$ sudo systemctl enable runonce.service
$ sudo systemctl start runonce.service

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DynamoDB local quick usage guide

Running a local version of DynamoDB inside a Docker container.

Commands

$ docker pull amazon/dynamodb-local:latest
$ docker run --publish 8000:8000 amazon/dynamodb-local

# in another terminal

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Golang io.TeeReader() example

• Opening a source words file.
• Create a io.TeeReader(), writing read file chunks also to a gzip writer.
• Output source chunks as read and total bytes.
• Finally, output compressed bytes and total compressed size.

Output

$ go run main.go

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GitHub token validation regular expressions

Regular expressions to check if a given GitHub token could be valid.

• Personal access tokens (classic)
• Fine-grained personal access tokens
• GitHub Actions
• Combined together

Personal access tokens (classic)

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Backblaze B2 via rclone cheatsheet

• Create B2 remote
• Tasks
  • List buckets
  • Synchronize local files to bucket
  • Synchronize local files to bucket - checksum
  • Verify local files against bucket
• Reference

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VirtualBox create host-only interface and attach

A host-only network interface is created virtually in software which appears to the host system.

This interface can be attached to one or more VMs, allowing connectivity between those VMs and communication between the host system and VMs.

• Create & attach interface
• Configure Ubuntu guests
  • Ubuntu 18.04+
  • Ubuntu pre 18.04