Update cheatsheets

tldr/last

@@ -8,26 +8,34 @@ source: https://github.com/tldr-pages/tldr.git
 > View the last logged in users.
 > More information: <https://manned.org/last>.
 
-- View last logins, their duration and other information as read from `/var/log/wtmp`:
+- View last login infromation (e.g., username, terminal, boot time, kernel) of all users as read from `/var/log/wtmp`:
 
 `last`
 
+- List login information of a specific user:
+
+`last {{username}}`
+
 - Specify how many of the last logins to show:
 
-`last -n {{login_count}}`
+`last {{[-n|--limit]}} {{login_count}}`
 
 - Print the full date and time for entries and then display the hostname column last to prevent truncation:
 
-`last -F -a`
+`last {{[-F|--fulltimes]}} {{[-a|--hostlast]}}`
 
 - View all logins by a specific user and show the IP address instead of the hostname:
 
-`last {{username}} -i`
+`last {{username}} {{[-i|--ip]}}`
+
+- List information since a specific time and date:
+
+`last {{[-s|--since]}} {{-7days}}`
 
 - View all recorded reboots (i.e., the last logins of the pseudo user "reboot"):
 
 `last reboot`
 
-- View all recorded shutdowns (i.e., the last logins of the pseudo user "shutdown"):
+- Display help:
 
-`last shutdown`
+`last {{[-h|--help]}}`