pacman

-D, --database 		# operate on the package database. can also check for internal consistancy.
-Q, --query			# query the package database. view packages and thier files, queries can be filtered.
-R, --remove 		# remove packages from the system. groups can be specified, every package in that group would be removed.
-S, --sync 			# synchronize packages. packages are installed directly from remote repos.
-T, --deptest		# check dependencies. (operation accepts no other options)
-U, --upgrade 		# upgrade or add a package to the system and install required dependencies from sync repos. 
-F, --files 		# query the files database.  operation allows looking for packages owning certain files.  only packages part of your sync database are searched.
-V, --version 		# display version number.
-h, --help 			# display syntax for the given operation.

sudo pacman -Syu    # basic update.
sudo pacman -Syyu   # force full refresh. (must do when switching branches or mirrors)
sudo pacman -Syyuu  # force full refresh plus allow downgrade of packages. (only needed when switching to older branch)
sudo pacman -Syu --ignore=firefox	# keeps an application from updating.

sudo pacman -Syu package1     # ideal way to install packages.
sudo pacman -U /var/cache/pacman/pkg/smplayer-19.5.0-1-x86_64.pkg.tar.xz  # install directly from system.
sudo pacman -U https://mirror.alpix.eu/manjaro/stable/community/x86_64/smplayer-19.5.0-1-x86_64.pkg.tar.xz
pacman -S package1 package2   # not advised to install packages this way. (may lead to partial upgrades)
pacman -S version/package1    # install a certain version.
pacman -Fl <package>		# check which files a package not yet installed would and where.

pacman -Ss string1 string2 ...    # search packages in sync database.
pacman -Fs string1 string2 ...    # search packages in file database.
pacman -Qs string1 string2 ...    # search for already installed packages.
pacman -Q 	  	# list all packages on the system.
pacman -Qc 		# view change log for installed application.
pacman -Qd 		# list all packages installed as dependencies.
pacman -Qe    	# list only packages you have installed. (explicitly)
pacman -Qen   	# the n makes it so version info is gone, just names of packages. (good for scripts)
pacman -Qet		# list explicit packages that have no dependencies.
pacman -Ql		# find all files owned by a package.
pacman -Qm    	# list only AUR packages.
pacman -Qn    	# list only packages from core. (sync database)
pacman -Qo		# check location of binary executable file owned by a package.
pacman -Qu		# find packages that need to be updated.

pacman -Qtd     # check for packages installed as dependency, but no longer used by any packages.  If orphaned packages is still needed (not a dependency) change installation reason to explicit.  Otherwise, remove it.  Run after `pacman -Syu`
sudo pacman -Rs $(pacman -Qdtq)   # remove all orphans
pacman -Qm    # see packages that are no longer in remote repository.

sudo pacman -Sw smplayer  # package and dependencies download to pacman cache `/var/cache/pacman/pkg`

pacman -Sg gnome      # list packages for gnome group

sudo pacman -Rsu smplayer 	# removes package & unneeded dependencies
sudo pacman -Rsun smplayer 	# removes package, dependencies, and backup config files
pacman -R package_name    	# remove package & leaves dependencies behind
pacman -Rs package_name   	# remove a package and its dependencies not used by other installed packages.
pacman -Sc                	# removes all cached packages that have not been installed.

pacman -Rn package_name
pacman -Rns package   		# best way to remove a package

sudo pacman -Si package   	# get info on package not on system
sudo pacman -Qi package   	# get info on package installed on system 

pacman -Sy      			# would do a partial install--very bad | always use `pacman -Syu` to upgrade
pacman -Rsc package_name    # removes package and all dependencies and all packages that depend on it recursively
pacman -Rdd package_name    # removes package required by another package, w/o removing dependent package.  skips dependency checks during package removal.  As a result, a package providing a critical dependency could be removed, resulting in a broken system.
pacman --overwrite    		# only use if explicitly told by arch developer

pacman -Si <package> | egrep -i groups		# shows all groups a package belongs to.

Color   					# add and comment out monochrome
ILoveCandy    				# changes progress bar to pacman eating powerpills