# Mastering Openssl Command and NSS Database Management
Practical OpenSSL and certutil guide: inspecting certificates, managing PKCS#12 (PFX) files, and working with the NSS certificate database.
Practical OpenSSL and certutil guide: inspecting certificates, managing PKCS#12 (PFX) files, and working with the NSS certificate database.
A hands-on tutorial for testing Angular apps with Karma and Jasmine: project setup, in-memory web API, services, specs, a cheatsheet and common Q&A.
Step-by-step guide to building unsigned and GPG-signed RPM packages with rpmbuild, verifying signatures, and creating yum repos with createrepo.
My tmux cheat sheet: shortcuts for panes, windows and sessions, plus configuration, plugins, iTerm2 integration and my own .tmux.conf tweaks.
My Docker notes: building images with a multi-stage Dockerfile or docker commit, export and import, and running a private Docker registry.
My Git cheat sheet: config, branches, fast-forward merge, clone, checkout, remotes, log, diff, stash, squash, and how to revert or reset commits.