Arch Linux

The only way to currently install a new package is to use pacman -Sy foo. Pretty much every documentation source states this as the way to install a package without explaining that, in fact, one really should issue a -Syu afterwards. Otherwise, problems like  FS#15566  can happen. However, this is rarely documented and one can hardly blame users for not knowing the dangers of a standalone -Sy foo.

It seems to me that a standalone -Sy foo should be strongly discouraged then, but IMO, this can only happen if we actually have a command that installs a package that way it is intended to be done! That is, there should be -Su foo and -Syu foo commands that issue a (-S foo; -Su) or a (-Sy foo; -Su) respectively. Then we can update the documentation to officially sanction these operations and start to ween users off of issuing standalone -Sy foo's. The -Sy foo command would instead become more of an expert operation where one can update a package if they know what you're doing. Perhaps the command should even give a warning to this effect.