Update cheatsheets

tldr/linux/gksu

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gksu
+
+> Frontend for `su`.
+> Allows you to run graphical commands which need root access without having to run an X terminal emulator.
+> Note: This command is deprecated in favor of commands like `pkexec`, and is no longer maintained.
+> See also: `gksudo`.
+> More information: <https://manned.org/man/gksudo>.
+
+- Run a command as a specific user:
+
+`gksu {{[-u|--user]}} {{userid}} {{command}}`
+
+- Run the command while preserving the current environments:
+
+`gksu {{[-u|--user]}} {{userid}} {{[-k|--preserve-env]}} {{command}}`
+
+- Force `gksu` to use `su` to run the command:
+
+`gksu {{[-u|--user]}} {{userid}} {{[-w|--su-mode]}} {{command}}`
+
+- Force `gksu` to use `sudo` to run the command:
+
+`gksu {{[-u|--user]}} {{userid}} {{[-S|--sudo-mode]}} {{command}}`
+
+- Output debug info for the given command:
+
+`gksu {{[-u|--user]}} {{userid}} {{[-d|--debug]}} {{command}}`