Update cheatsheets

unimatrix

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# unimatrix
+
+> Simulate the Matrix look with Unicode characters.
+> See also: `cmatrix`.
+> More information: <https://github.com/will8211/unimatrix>.
+
+- Mimic the default output of `cmatrix` (no unicode, works in a TTY):
+
+`unimatrix --no-bold --speed {{96}} --character-list {{o}}`
+
+- No bold characters, slowly, with emojis, numbers, and a few symbols:
+
+`unimatrix --no-bold --speed {{50}} --character-list {{ens}}`
+
+- Change the color of characters:
+
+`unimatrix --color {{red|green|blue|white|...}}`
+
+- Select character set(s) using letter codes (see `unimatrix --help` for available character sets):
+
+`unimatrix --character-list {{character_sets}}`
+
+- Change the scrolling speed:
+
+`unimatrix --speed {{number}}`