Update cheatsheets

linux/ac

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ac
+
+> Print statistics on how long users have been connected.
+> More information: <https://www.gnu.org/software/acct/manual/accounting.html#ac>.
+
+- Print how long the current user has been connected in hours:
+
+`ac`
+
+- Print how long users have been connected in hours:
+
+`ac --individual-totals`
+
+- Print how long a particular user has been connected in hours:
+
+`ac --individual-totals {{username}}`
+
+- Print how long a particular user has been connected in hours per day (with total):
+
+`ac --daily-totals --individual-totals {{username}}`
+
+- Also display additional details:
+
+`ac --compatibility`