Update cheatsheets

linux/ntpdate

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ntpdate
+
+> Synchronize and set the date and time via NTP.
+> More information: <http://support.ntp.org/documentation>.
+
+- Synchronize and set date and time:
+
+`sudo ntpdate {{host}}`
+
+- Query the host without setting the time:
+
+`ntpdate -q {{host}}`
+
+- Use an unprivileged port in case a firewall is blocking privileged ports:
+
+`sudo ntpdate -u {{host}}`
+
+- Force time to be stepped using `settimeofday` instead of `slewed`:
+
+`sudo ntpdate -b {{host}}`