Hello, my name is DJ and this is 'autodidactics', a lightweight blog where I write about bits and pieces that I pick up from content created by other folks - in particular small things that I learn from studying the code they write. Find out more about me and the content I create over on my home website.

Latest Post

Case modification operators in parameter substitution (16 Oct)

Today I learned that in addition to the usual ways of uppercasing strings, Bash 4 brought the addition of case modification operators to the parameter substitution family.

Archive

2020

MID$ and shell parameter expansion (11 Oct)

Understanding declare (8 Oct)

Desnowballification with set -o errexit (6 Oct)

Checking a command is available before use (4 Oct)

curl and multipart/form-data (4 Oct)

Using exec to jump (3 Oct)

Shell parameter expansion with :+ is useful (27 Sep)

You can mask sensitive hostnames with wildcards and host aliases (25 Aug)

The open square bracket [ is an executable (21 Aug)

Why we have /bin/ and /usr/bin/ (16 Aug)

String.prototype.replace() can take a function (4 Aug)

continue-on-error can prevent a job step failure causing an action failure (21 Jul)

In an mta.yaml file you can use the service-name parameter to point to an existing resource (20 Jul)

git diff can emit different exit codes (20 Jul)