Update cheatsheets

linux/xterm

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xterm
+
+> A terminal emulator for the X Window System.
+> More information: <https://manned.org/xterm>.
+
+- Open the terminal with a title of `Example`:
+
+`xterm -T {{Example}}`
+
+- Open the terminal in fullscreen mode:
+
+`xterm -fullscreen`
+
+- Open the terminal with a dark blue background and yellow foreground (font color):
+
+`xterm -bg {{darkblue}} -fg {{yellow}}`
+
+- Open the terminal with 100 characters per line and 35 lines, in screen position x=200px, y=20px:
+
+`xterm -geometry {{100}}x{{35}}+{{200}}+{{20}}`
+
+- Open the terminal using a Serif font and a font size equal to 20:
+
+`xterm -fa {{'Serif'}} -fs {{20}}`