Merge 295fe153ad into 63bb627716

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1493 TILs and counting..._
+_1491 TILs and counting..._
 
 ---
 
@@ -771,7 +771,6 @@ _1493 TILs and counting..._
 - [Force SSL When Making A psql Connection](postgres/force-ssl-when-making-a-psql-connection.md)
 - [Generate A UUID](postgres/generate-a-uuid.md)
 - [Generate Modern Primary Key Columns](postgres/generate-modern-primary-key-columns.md)
-- [Generate Random Alphanumeric Identifier](postgres/generate-random-alphanumeric-identifier.md)
 - [Generate Random UUIDs Without An Extension](postgres/generate-random-uuids-without-an-extension.md)
 - [Generate Series Of Numbers](postgres/generate-series-of-numbers.md)
 - [Generating UUIDs With pgcrypto](postgres/generating-uuids-with-pgcrypto.md)
@@ -1517,7 +1516,6 @@ _1493 TILs and counting..._
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [Tell direnv To Load The Env File](unix/tell-direnv-to-load-the-env-file.md)
 - [Touch Access And Modify Times Individually](unix/touch-access-and-modify-times-individually.md)
-- [Undo Changes Made To Current Terminal Prompt](unix/undo-changes-made-to-current-terminal-prompt.md)
 - [Undo Some Command Line Editing](unix/undo-some-command-line-editing.md)
 - [Unrestrict Where ripgrep Searches](unix/unrestrict-where-ripgrep-searches.md)
 - [Update Package Versions Known By asdf Plugin](unix/update-package-versions-known-by-asdf-plugin.md)

postgres/generate-random-alphanumeric-identifier.md

@@ -1,46 +0,0 @@
-# Generate Random Alphanumeric Identifier
-
-Here is a PostgreSQL query that uses
-[`pgcrypto`](https://www.postgresql.org/docs/current/pgcrypto.html) (for
-[`get_random_bytes`](https://www.postgresql.org/docs/current/pgcrypto.html#PGCRYPTO-RANDOM-DATA-FUNCS))
-and a CTE to generate a cryptographically-random 8-character alphanumeric
-identifier.
-
-```sql
--- First ensure pgcrypto is installed
-create extension if not exists pgcrypto;
-
--- Generates a single 8-character identifier
-with chars as (
-  -- excludes some look-alike characters
-  select '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz' as charset
-),
-random_bytes as (
-  select gen_random_bytes(8) as bytes
-),
-positions as (
-  select generate_series(0, 7) as pos
-)
-select string_agg(
-  substr(
-    charset,
-    (get_byte(bytes, pos) % length(charset)) + 1,
-    1
-  ),
-  '' order by pos
-) as short_id
-from positions, random_bytes, chars;
-```
-
-The
-[`generate_series`](https://www.postgresql.org/docs/current/functions-srf.html)
-gives us an 8-row table from 0 to 7 that we can use as indexes into the byte
-positions of the value we get from `gen_random_bytes`. Those random bytes get
-mapped to individual alphanumeric characters from `chars`. That then gets
-squeezed together with `string_agg`.
-
-Note: the character set excludes some characters that can be mistaken for one
-another like `0` and `O` or `1` and `l`.
-
-Note: you could change the right-bound of the `generate_series` to generate a
-different length identifier.

unix/undo-changes-made-to-current-terminal-prompt.md

@@ -1,20 +0,0 @@
-# Undo Change Made to Current Terminal Prompt
-
-I frequently use a variety of ASCII command characters like `ctrl-u` to delete
-the entire line or `ctrl-a` to jump to the front of a long line so I can make
-some edits toward that side of the command or `ctrl-e` to jump to the end of
-the command for the same reason. I sometimes even use `ctrl-k` to delete
-everything after the cursor to the end of the line.
-
-What I didn't realize until now is that any of those commands the modify the
-current line of the termianl prompt plus regular typing and hitting the
-backspace are all _undoable_.
-
-So, if I just wiped out half the line (with `ctrl-k`) and I immediately regret
-it, I can restore it with `ctrl-_`. The system keeps of history of the actions
-you've taken, so you can keep hitting `ctrl-_` to undo even further.
-
-The `ctrl-/` command does the same, per GNU's [Undo Changes in the Emacs
-docs](https://www.gnu.org/software/emacs/manual/html_node/emacs/Basic-Undo.html).
-
-[source](https://jvns.ca/ascii)