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I've searched the net for such information and found different command lines, like these ones:

sudo apt-get remove application
sudo apt-get remove application*

sudo apt-get remove --purge application
sudo apt-get remove --purge application*

sudo apt-get purge application
sudo apt-get purge application*

So, what is the correct way? Is it necessary to use that "*"?

After that, I also found these commands:

sudo updatedb
sudo locate application
sudo rm -rf (file/folder name)

Thanks for your time.

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Some of your questions might be answered in this post: askubuntu.com/questions/1143/how-can-i-uninstall-software –  Glutanimate Sep 14 '12 at 22:03
2  
application* can on occasion give unexpected results - for example, if you have a file in the current directory named application_information, the shell would expand it before it's passed to apt-get. If this is happening and you do want the literal asterisk, you can use application\* or 'application*' –  Izkata Sep 15 '12 at 3:27
2  
application* is even more dangerous where there are no files in the current directory: apt-get uses regular expressions, no glob patterns. People have almost wiped the whole system trying to remove wine*. –  Andrea Corbellini Nov 23 '13 at 9:40

5 Answers 5

  • apt-get remove packagename

    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

    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

    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)

    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:

  1. 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).

  2. 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.

  3. 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.

These commands,

sudo updatedb                  # <-- updates the locate database (index). harmless
sudo locate application        # <-- locates the file 'application'. harmless
sudo rm -rf (file/folder name) # <-- removes files/dirs recursively. dangerous.

are completely outside the scope of the package management. 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
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The --purge option is also handy when trying to fully remove any remaining dependencies including their config files: apt-get-autoremove --purge It's also important to note that configuration files in your home directory are unaffected by the --purge option. These you will have to remove manually. –  Glutanimate Sep 14 '12 at 22:16
1  
There was an error here: apt-get accepts RE, not globs; so apt-get remove pack* will remove all packages that starts with pac followed by zero or more k... which is normally unexpected. I edited the anser. See also askubuntu.com/questions/210976/… –  Rmano Oct 9 at 11:12

For Ubuntu 12.04 and maybe higher, the correct method is:

sudo apt-get --purge autoremove packagename

As detailed here.

Do not use packagename* as that can delete unintended packages and cause more problems than it solves. Or if you must, at least run it with a -s/--simulate/--dry-run flag first to see exactly what it will do without doing it.

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You can safely use sudo apt-get remove --purge application or sudo apt-get remove applications 99% of the time. When you use the purge flag, it simply removes all config files too. Which may or may not be what you want, depending on if you want to reinstall said application. The application* will match all applications that start with application, which are usually plugins, additional features, etc of the main application you are removing. i.e.

sudo apt-get remove gedit*

would remove gedit, gedit-plugins and gedit-common. Typically it is not necessary to do this, because most plugins/associated programs are dependent on the main application, and will automatically be removed (or marked for removal) when you uninstall the main application.

Your last command is just to remove leftovers from applications that are known to have messy uninstallers, and it is just removing any remnants of the application.

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It depends on the application you want to remove. Always be sure to check its dependencies before issuing the yes command. When you remove something by command line, it will sometimes show a handful of libraries that are no longer needed. These can be removed with apt-get autoremove.

Beware that by using commands such as sudo apt-get remove --purge applicationname may remove some dependencies that are needed by other applications and, as such, might break your system.

If you want to do it in the safer way, you can always remove it using just the software center or apt-get remove applicationname. If the dependencies aren't needed anymore, issue apt-get autoremove later.

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I found this command in internet.

dpkg --purge --force-depends application

http://www.debian-administration.org/article/Reinstalling_packages_to_fix_problems.

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