What is PostgreSQL? Part 1 of the PostgreSQL Tutorial explains databases, tables, rows, columns, keys and SQL in plain words, and how PostgreSQL works. No installs yet.
not valid in this context is zsh refusing a variable name with a dot in it. ASP.NET Core log categories are full of dots, so to turn one down through an environment variable, export won't do. env will.
curl http://localhost:5190/demo/enum?status=placed and grep -rn 'class' src --include=*.cs both failed with zsh: no matches found, and neither program ever ran. Commands like these work in bash, and they appear that way in a lot of tutorials. In zsh, you have to quote them.
![A zsh terminal where echo ====== prints zsh: ===== not found, and [ "$a" == 1 ] && echo same prints zsh: = not found.](https://i0.wp.com/jd-bots.com/wp-content/uploads/2026/11/zsh-equals-01-error.webp?fit=600%2C195&ssl=1)
I printed a line of equals signs in zsh, the default shell on macOS, and got zsh: ===== not found instead. The same thing happens to [ "$a" == 1 ], as zsh: = not found. zsh reads a word that starts with = as the name of a command; quote the word, and the line prints.
The Adaptive Cards Designer always writes version 1.6 into the JSON it copies and exports, even after you type 1.5. Teams and Copilot Chat support 1.5, so change the version in your copy.
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