Update cheatsheets

linux/urxvt

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# urxvt
+
+> Rxvt-unicode.
+> A customizable terminal emulator.
+> More information: <https://manned.org/urxvt>.
+
+- Open a new urxvt window:
+
+`urxvt`
+
+- Run in a specific directory:
+
+`urxvt -cd {{path/to/directory}}`
+
+- Run a command in a new urxvt window:
+
+`urxvt -e {{command}}`
+
+- Run a command and keep the window open:
+
+`urxvt --hold -e {{command}}`
+
+- Run a command within the `sh` shell:
+
+`urxvt -e {{sh}} -c {{command}}`