added an alias for tree command if it doesnt exist on the system

Author: harleypig

recipes/Bash/tree_alias/LICENSE.md

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+This work is released to the public domain under the CC0 (Creative Commons) license terms: https://creativecommons.org/publicdomain/zero/1.0/legalcode

recipes/Bash/tree_alias/README.md

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+### An alias for the tree command
+
+Author: Unknown
+Submitter: Alan Young (harleypig)
+
+If the tree command does not exist on your system, this alias will fake it.
+
+I got this from a co-worker a long time ago. I don't remember when, or who it was. If it was you, let me know and I'll update this.

recipes/Bash/tree_alias/tree

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+#!/bin/bash
+
+# I got this from a co-worker many moons ago. Unfortunately, I don't remember
+# who. Basically, if a tree program is not installed, fake it with this.
+
+if ! command -v tree > /dev/null 2>&1; then
+
+  alias tree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"
+
+fi