Add Search For Gem Versions Available To Install as a Ruby TIL

Author: jbranchaud

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).
 
-_1341 TILs and counting..._
+_1342 TILs and counting..._
 
 ---
 
@@ -1124,6 +1124,7 @@ _1341 TILs and counting..._
 - [Safe Navigation Operator](ruby/safe-navigation-operator.md)
 - [Scripting With RVM](ruby/scripting-with-rvm.md)
 - [Scroll To Top Of Page With Capybara](ruby/scroll-to-top-of-page-with-capybara.md)
+- [Search For Gem Versions Available To Install](ruby/search-for-gem-versions-available-to-install.md)
 - [Set RVM Default Ruby](ruby/set-rvm-default-ruby.md)
 - [Shift The Month On A Date Object](ruby/shift-the-month-on-a-date-object.md)
 - [Show Public Methods With Pry](ruby/show-public-methods-with-pry.md)

ruby/search-for-gem-versions-available-to-install.md

@@ -0,0 +1,33 @@
+# Search For Gem Versions Available To Install
+
+The [`gem list`](https://guides.rubygems.org/command-reference/#gem-list)
+command combined with a few flags will produce a listing of all available
+versions of that gem like so:
+
+```bash
+gem list rails --exact --remote --all
+
+*** REMOTE GEMS ***
+
+rails (7.1.0, 7.0.8, 7.0.7.2, 7.0.7.1, 7.0.7, ...)
+```
+
+I can then apply a bit of command-line transformation with `sed` and `tr` to
+turn that list of version numbers into a list that can be nicely consumed by
+other commands. In particular, I will pipe that list to `fzf` so that I can
+fuzzy-search through the huge list for specific version matches.
+
+```bash
+$ gem list rails --exact --remote --all \
+  | sed -n 's/.*(\([^)]*\)).*/\1/p' \
+  | tr ',' '\n' \
+  | sed 's/^ //' \
+  | fzf
+```
+
+The first `sed` command captures everything inside the parentheses. The `tr`
+command replaces the commas with new lines. And the second `sed` command
+removes those leading space on each line.
+
+Lastly, [`fzf`](https://github.com/junegunn/fzf) provides a fuzzy-search
+interface over the list of versions.