Update cheatsheets

osx/systemsetup

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemsetup
+
+> Configure System Preferences machine settings.
+> More information: <https://support.apple.com/guide/remote-desktop/about-systemsetup-apd95406b8d/mac>.
+
+- Enable remote login (SSH):
+
+`systemsetup -setremotelogin on`
+
+- Specify timezone, NTP Server and enable network time:
+
+`systemsetup -settimezone "{{US/Pacific}}" -setnetworktimeserver {{us.pool.ntp.org}} -setusingnetworktime on`
+
+- Make the machine never sleep and automatically restart on power failure or kernel panic:
+
+`systemsetup -setsleep off -setrestartpowerfailure on -setrestartfreeze on`
+
+- List valid startup disks:
+
+`systemsetup -liststartupdisks`
+
+- Specify a new startup disk:
+
+`systemsetup -setstartupdisk {{path/to/directory}}`