Tag command-line
Toggling Your Bluetooth Connection using bluetoothctl on the Command-Line (1 mins read).
How to script bluetoothctl to toggle your connection to a Bluetooth device.
by 
Jamie Tanna
.
#blogumentation
#command-line
#bluetoothctl
#bluetooth.
A great addition for those scripting with curl!
by Jamie Tanna
.
#command-line.
Splitting an X509 PEM-Encoded Certificate Bundle into Multiple Files (1 mins read).
Splitting a certificate bundle into separate files using split or awk.
by Jamie Tanna
.
#blogumentation
#command-line
#certificates.
by Jamie Tanna
.
#command-line
#linux
#unix.
How to Use curl to Send Requests to Domains Without Editing Your /etc/hosts File (1 mins read).
Using curl's --resolve flag to perform custom lookup for hosts.
Triggering an AWS Lambda from the Command-Line (1 mins read).
How to invoke an AWS Lambda function from the Command-Line.
Generating HMAC Signatures on the Command Line with OpenSSL (1 mins read).
How to generate HMAC signatures for a given string, using openssl.
by Jamie Tanna
.
#blogumentation
#command-line
#openssl
#hmac
#java.
Creating Signed JWTs (JWS) with Node.JS (1 mins read).
How to use the jsonwebtoken library to create a Signed JSON Web Token (JWS) with Node.JS.
by Jamie Tanna
.
#blogumentation
#nodejs
#command-line
#jwt
#json.
I used to write a lot of shell scripts before realising that what I was trying to do was treat shell scripting as a "full" scripting language (I won't define here what I mean by "full").
Its not - reach for a higher level scripting language like Ruby or Python when things are getting more complicated, and allow shell scripts to glue things together, or be for quick tasks maybe a few lines long.
When you do write them, this advice is great but it's definitely worth gaining understanding of when you should and shouldn't use them.
by Jamie Tanna
.
#command-line
#shell
#bash.
Parsing a Unix Epoch With Bash/Ruby on the Command-Line (1 mins read).
How to convert a Unix Epoch to a human-readable date format.
by Jamie Tanna
.
#blogumentation
#command-line
#ruby
#shell.
Very interesting to see that there's even more to the command than expected - and some great new features coming soon.
by Jamie Tanna
.
#command-line.
Pretty Printing XML on the Command-Line (1 mins read).
How to use xmllint to pretty-print XML/HTML files.
by Jamie Tanna
.
#blogumentation
#html
#xml
#pretty-print
#command-line.
List What Files Changed in a Git Commit (1 mins read).
How to list what files changed in a given commit.
Using the OpenSSL Command-Line to Verify an SSL/TLS Connection (2 mins read).
How to use the openssl command-line to verify whether certs are valid.
by Jamie Tanna
.
#blogumentation
#openssl
#certificates
#command-line
#nablopomo.
Pretty Printing YAML with the Ruby Command-Line (1 mins read).
Using Ruby's YAML library to pretty-print YAML files from the command-line.
by Jamie Tanna
.
#nablopomo
#blogumentation
#ruby
#yaml
#pretty-print
#command-line.
This is my go-to for tidying up disk space issues when working with Docker
Piping Data When Not Running a Command with sudo (1 mins read).
How to (more) safely pipe stdin to an elevated command with sudo tee.
by Jamie Tanna
.
#blogumentation
#command-line
#nablopomo
#security.
Minifying JSON with Python (1 mins read).
How to take a pretty-printed JSON string and replace it with a minifed JSON string using Python.
by Jamie Tanna
.
#python
#command-line
#blogumentation
#nablopomo
#json
#minify-json.
Minifying JSON with Ruby (1 mins read).
How to take a pretty-printed JSON string and replace it with a minifed JSON string using Ruby.
by Jamie Tanna
.
#ruby
#command-line
#blogumentation
#nablopomo
#json
#minify-json.
This is a great resource to highlight the difficulty of creating temporary files safely - something I've tried to share before but without these great examples.
Its especially bad if using a shared CI/CD server and putting downloaded files into /tmp as you don't know whether it'll be clobbered / stolen by others on the instance
by Jamie Tanna
.
#linux
#command-line.
This is a great article about how to be safer when writing shell scripts. I am a huge proponent of not using them where possible, and instead moving them to another scripting language (Ruby, Python, Node) which you can test, and use a shared standard library.
by Jamie Tanna
.
#shell
#command-line.
Adding Newlines to all Files in Git (3 mins read).
Adding newlines at the end of all Git-tracked files.
Easily Parsing Failed Cucumber Scenarios from the JSON Report (2 mins read).
How to parse a Cucumber JSON report to display the failed scenarios and their causes.
by Jamie Tanna
.
#blogumentation
#cucumber
#ruby
#command-line.
This is a great post - I thoroughly recommend learning how to use common commandline tools such as awk, grep, sed, but also adopting a scripting language for more complicated stuff. I don't mean Bash, or another shell scripting language, but something like Node, Python or Ruby, as it'll give you the opportunity for a greater standard library, as well as tonnes of packages built by others.
by Jamie Tanna
.
#command-line.
Pretty Printing JSON Files Inline on the Command Line (2 mins read).
How to rewrite multiple JSON files inline on the Command Line.
by Jamie Tanna
.
#blogumentation
#pretty-print
#command-line
#ruby.
Pretty Printing JSON Web Tokens (JWTs) on the Command Line using OpenSSL (3 mins read).
How to easily introspect a JWT on the command line using OpenSSL and optionally Python for real pretty-printing.
by Jamie Tanna
.
#blogumentation
#python
#command-line
#jwt
#json
#pretty-print.
In every programming language, there is a linting tool that can help pick up on some common style issues. ShellCheck isn't one of those - it's so much more!
I've been using it for many years now, and since it came into my life it's honestly changed the way I use shell scripts. There have been so many pitfalls that I've avoided falling into since learning about them (and adding ShellCheck to my Vim linting setup.
This is a great read from Vidar, the ShellCheck author, about a case where it could've caught issues that caused the deletion of a production database!
by Jamie Tanna
.
#shell
#command-line.
URL Decoding with Ruby on the Command Line (1 mins read).
How to use Ruby's standard library to decode URLs with a handy one-liner.
Viewing X.509 DER Certificate Fingerprints with OpenSSL (1 mins read).
How to view an X.509 DER certificate's fingerprint using openssl commands.
by Jamie Tanna
.
#blogumentation
#certificates
#command-line
#der
#openssl.
Viewing X.509 PEM Certificate Fingerprints with OpenSSL (1 mins read).
How to view an X.509 PEM certificate's fingerprint using openssl commands.
by Jamie Tanna
.
#blogumentation
#certificates
#command-line
#pem
#openssl.
Verifying Signed JWTs (JWS) with Node.JS (3 mins read).
How to use the jsonwebtoken and node-jose libraries to verify the signature of a Signed JSON Web Token (JWS) with Node.JS.
by Jamie Tanna
.
#blogumentation
#nodejs
#command-line
#jwt
#json.
Setting your default AWS profile for the AWS CLI and SDKs (2 mins read).
Setting the default AWS profile when working with multiple profiles and the AWS CLI / SDKs.
by Jamie Tanna
.
#blogumentation
#aws
#aws-cli
#aws-sdk
#command-line.
Viewing X.509 DER Certificate Details with OpenSSL (2 mins read).
How to convert an X.509 DER file to a human-readable format using openssl commands.
by Jamie Tanna
.
#blogumentation
#certificates
#command-line
#der
#openssl.
Viewing X.509 PEM Certificate Details with OpenSSL (2 mins read).
How to convert an X.509 PEM file to a human-readable format using openssl commands.
by Jamie Tanna
.
#blogumentation
#certificates
#command-line
#pem
#openssl.
Safely Force Pushing with Git using --force-with-lease=ref (6 mins read).
How git push --force-with-lease=ref can save you from overriding others' changes on shared Git branches.
My editorial workflow for blog posts (8 mins read).
Taking you through the journey I go on when writing blog posts, from ideation to publishing the post.
by Jamie Tanna
.
#www.jvt.me
#workflow
#ci
#gitlab
#git
#automation
#command-line
#shell
#gitlab-ci
#review-apps.
Viewing Git history of a file in git log while ignoring file renames (5 mins read).
How to track changes to files in Git without pesky file renames getting in the way, using git log --follow.