What is the correct way to completely remove an application?

What is the correct way to completely remove an application?

apt-get remove packagename  删除二进制可执行文件

will remove the binaries, but not the configuration or data files of the package

packagename

. It will also leave dependencies installed with it on installation time untouched.

apt-get purge packagename

or

apt-get remove --purge packagename
删除所有与包相关的文件。

will remove about everything regarding the package

packagename

, but not the dependencies installed with it on installation. Both commands are equivalent.

Particularly useful when you want to 'start all over' with an application because you messed up the configuration. However, it does not remove configuration or data files residing in users home directories, usually in hidden folders there. There is no easy
way to get those removed as well.

apt-get autoremove 删除所有不再被依赖的包。

removes orphaned packages, i.e. installed packages that used to be installed as an dependency, but aren't any longer. Use this after removing a package which had installed dependencies you're no longer interested in.

aptitude remove packagename

or

aptitude purge packagename

(likewise)
一次性同时删除本package及相关的功能依赖包

will also attempt to remove then not used dependencies anymore in one step.

And many more exist. Lower-level

dpkg

-commands can be used (advanced), or GUI tools like Muon, Synaptic, Software Center, etc.
There's no single 'correct way' of removing applications or performing other tasks interacting with your package management.

The list you found are just examples. Make sure you understand the meanings and try out what it wants to do before accepting the action (you need to press

Y

before it actually performs the actions as proposed).

The asterisk version in the question is probably wrong;

apt-get

accepts a regular expression and not a glob pattern as the shell. So what happens with

sudo apt-get remove application*

is the following:

The shell try to expand

application*

looking at the files in the current directory. If (as normally is the case) find nothing, it returns the glob patter unaltered (supposing

bash

with default behavior here ---

zsh

will error out).

apt-get

will remove the packages whose name contains a string that satisfy the regular expression

application*

, that is,

applicatio

followed by an arbitrary number of

n

:

applicatio

,

application

,

applicationn

,

libapplicatio

, etc.

to see how this can be dangerous, try (without root for double safety)

apt-get -s remove "wine*"

(

-s

will simulate the thing instead of doing it) --- it will say is going to remove all packages that has "win" in their name and the
dependant, almost all system...

Probably, the command that was meant is really

sudo apt-get remove "^application.*"

(note the quotes and the dot) which will remove all packages whose name starts with

application

.

Do not remove files belonging to packages without using the package management! It will get confused and is the
wrong way to do things.

If you don't know to which package a file belongs, try this:

dpkg -S /path/to/file