add the old snippet md files

old_snippets/lower-case.en.md

@@ -0,0 +1,20 @@
+---
+title: "lower case string"
+seo_description: "Shell snippet expanding how to lower case words"
+date: 2022-02-13T12:17:50+01:00
+draft: false
+snippet_types:
+- tr
+---
+
+TR is a Unix until to translate characters I recently learned about as part of [this awk snippet](/snippets/awk-last-column).
+
+```shell
+$ echo "TRAVIS" | tr '[:upper:]' '[:lower:]'
+travis
+```
+
+[source](https://www.shellscript.sh/tips/case/)
+
+
+