Update cheatsheets

tldr/linux/last

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# last
+
+> List information of last user logins.
+> See also: `lastb`, `login`.
+> More information: <https://manned.org/last.1>.
+
+- List login information (e.g., username, terminal, boot time, kernel) of all users:
+
+`last`
+
+- List login information of a specific user:
+
+`last {{username}}`
+
+- List information of a specific TTY:
+
+`last {{tty1}}`
+
+- List most recent information (by default, the newest are at the top):
+
+`last | tac`
+
+- List information of system boots:
+
+`last "{{system boot}}"`
+
+- List information with a specific [t]imestamp format:
+
+`last --time-format {{notime|full|iso}}`
+
+- List information [s]ince a specific time and date:
+
+`last --since {{-7days}}`
+
+- List information (i.e., hostname and IP) of remote hosts:
+
+`last --dns`