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hdiutil

Glen.tx.rr.com# hdiutil
hdiutil: missing verb
Usage: hdiutil  
 is one of the following:
help            	flatten
attach          	imageinfo
detach          	isencrypted
eject           	makehybrid
verify          	mount
create          	mountvol
compact         	unmount
convert         	plugins
burn            	resize
info            	segment
checksum        	pmap
chpass          	udifderez
erasekeys       	udifrez
unflatten

softwareupdate

Glen.tx.rr.com# softwareupdate
usage: softwareupdate  [ ...]

** Manage Updates:
	-l | --list		List all appropriate update labels (options:  --no-scan, --product-types)
	-d | --download		Download Only
	-e | --cancel-download		Cancel a download
	-i | --install		Install
		 ...	specific updates
		-a | --all		All appropriate updates
		-R | --restart		Automatically restart (or shut down) if required to complete installation.
		-r | --recommended	Only recommended updates
	--fetch-full-installer		Install the latest macOS Installer
		--full-installer-version	The version of macOS to install. Ex: --full-installer-version 10.15
	--background		Trigger a background scan and update operation
	--ignore  ...	Ignore specific updates
	--reset-ignored		Clear all ignored updates

** Other Tools:
	--dump-state		Log the internal state of the SU daemon to /var/log/install.log
	--evaluate-products	Evaluate a list of product keys specified by the --products option
	--history		Show the install history.  By default, only displays updates installed by softwareupdate.
	--all 			Include all processes in history (including App installs)

** Options:
	--no-scan		Do not scan when listing or installing updates (use available updates previously scanned)
	--product-types 		Limit a scan to a particular product type only - ignoring all others
		Ex:  --product-types macOS  || --product-types macOS,Safari
	--products		A comma-separated (no spaces) list of product keys to operate on.
	--force			Force an operation to complete.  Use with --background to trigger a background scan regardless of "Automatically check" pref

	--verbose		Enable verbose output
	--help			Print this help

sw_vers

To query the operating system for its current version from the command line (or terminal window) you may execute the sw_vers command. This is useful in scripting and automation.

US-GLENG-MACBOOK:~ gleng$ sw_vers -productVersion
10.14.6
US-GLENG-MACBOOK:~ gleng$