Update cheatsheets

tldr/linux/systemd-cryptsetup

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemd-cryptsetup
+
+> Create or remove decrypted mappings of encrypted volumes. Equivalent of `cryptsetup open` and `cryptsetup close`.
+> Arguments to this command are written exactly like a line in `/etc/crypttab`. It's used by systemd to unlock devices on boot.
+> See also: `cryptsetup`.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemd-cryptsetup.html>.
+
+- Open a LUKS volume and create a decrypted mapping at `/dev/mapper/mapping_name`:
+
+`systemd-cryptsetup attach {{mapping_name}} {{/dev/sdXY}}`
+
+- Open a LUKS volume with additional options and create a decrypted mapping at `/dev/mapper/mapping_name`:
+
+`systemd-cryptsetup attach {{mapping_name}} {{/dev/sdXY}} none {{crypttab_options}}`
+
+- Open a LUKS volume with a keyfile and create a decrypted mapping at `/dev/mapper/mapping_name`:
+
+`systemd-cryptsetup attach {{mapping_name}} {{/dev/sdXY}} {{path/to/keyfile}} {{crypttab_options}}`
+
+- Remove an existing mapping:
+
+`systemd-cryptsetup detach {{mapping_name}}`