update

docs/cmnds/linux-commands.md

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+### Send command every X seconds automatically
+
+Replace {{command}} with your command and {{seconds}} with number of seconds you want between each message.
+
+```
+while true;do {{command}};sleep {{seconds}}; done
+```
+
+### Sudo with password 1-line
+
+Replace {{password}} with root password
+
+```
+echo {{password}} | sudo -S apt-get update && sudo apt-get upgrade -y
+```