Created BSD (markdown)

BSD.md

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+# Package managers for various OS
+
+1. Edit script: `nano something.sh`
+2. Save and Exit: Ctrl-o Enter Ctrl-x Enter
+3. Make executeable: `chmod +x *.sh`
+
+## Ubuntu
+
+update.sh
+```
+sudo apt update
+sudo apt -y dist-upgrade
+sudo snap refresh
+flatpak update
+```
+clean.sh
+```
+sudo apt clean
+sudo apt -y autoclean
+sudo apt -y autoremove
+```
+install.sh
+```
+sudo apt -y install $1
+```
+uninstall.sh
+```
+sudo apt remove $1
+# more dangerous, all configs and data: sudo apt --purge remove $1
+```
+
+## NetBSD
+
+Before these, change to root:
+```
+su
+```
+update.sh
+```
+pkgin upgrade
+```
+install.sh
+```
+pkgin install $1
+```
+uninstall.sh
+```
+pkg_delete $1
+```