ntp: added

wiki/linux/ntp.md

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+# NTP
+
+[NTP](https://www.rfc-editor.org/rfc/rfc5905) - short for Network Time Protocol
+- is the most common method to synchronize the software clock of a
+[Linux](/wiki/linux/linux.md) system.
+
+## Setup
+
+NTP can be installed on most distributions by installing the
+`ntp` package.
+
+## Usage
+
+The following section describes the usage of the NTP package.
+
+### Synchronize Time once
+
+For one time synchronization of the time and date the `ntpdate` command can be
+used.
+The following command is an example for a one time sync.
+Note that the server has to be changed for different time zones.
+In this case a german time server is used.
+
+```sh
+ntpdate -q 0.de.pool.ntp.org
+```