In this section, we learned about:

• Github Workflows and the YAML syntax they use:
  • Establishing a workflow’s metadata via directives like name, on, push, release, tags, etc.
  • Making one or more jobs for the workflow with the jobs directive
  • Establishing when your job runs, using the runs-on directive
  • What a matrix strategy is, and how to build one using the strategy and matrix directives
  • Establishing what steps your job takes, using the steps directive
  • Using pre-written steps, written by you or others, via the uses directive
  • Running arbitrary shell code in a step using the run directive
  • Passing environment variables to a step using the env keyword
  • Running a step only when certain conditions are met, using the if directive
  • Passing arguments to a step using the with directive
• What the difference between the bin/ and libexec/ directories are for, according to the Filesystem Hierarchy Standard
• Testing whether a shell option is turned on via the [[ -o <optionanme> ]] syntax
• How to test the type of a variable using parameter expansion, coupled with the (t) parameter
• How to generate completions for a command in zsh, using compctl -K
• How to generate completions for a command in Bash, using complete -F
• What a bindir or bin_dir is
• How RBENV automatically re-generates its shims when a gem is installed or uninstalled, using the RubyGems hooks ecosystem.
• Why you might use a delimiter other than / when using sed to search-and-replace.