When I add myself "vboxusers" group I an no longer in the "admins" group

Question

Code:

digits.each do |digit|
  puts digit.content #&0000000000032056.00000032 056
  value = digit.content[24..-1].strip
  puts value #32 056 it's ok
  puts value.gsub(/\s+/, "") #32 056 !!!! I expected 32056
  population << value
end

I don't understand why gsub does not work as I expected :/ Could somebody help?

[EDIT]

Anyway I do it another way:

  value = digit.content.split(".")[0]
  value = value[12..-1].strip

but I am still wonder, why first solution sucks.

Solution 1

Your second command is right.

By default, usermod -G replaces all supplementary groups the user is in (the primary group is generally named the same as your username, and specified separately; don't mess with that though). By also using -a it appends the groups you give.

So this should work (and does, for me, just tried it):

usermod -aG vboxusers myusername

If running that command takes you out of any other group then you've found a bug. Note you have to relogin to see the effects.

Solution 2

According to the usermod man page the correct command to add a user to a group is

sudo usermod -G group -a username

or in your case since you want to add your self to the vboxusers group that will be

sudo usermod -G vboxusers -a $USER

Solution 3

Alternatively:

gpasswd --add myusername vboxusers

Solution 4

Never use the top method to add a user to vboxusers by using the usermod -G vboxusers myusername command. This will make you lose your sudo privileges!

If you have lost your sudo privileges, you can use the method described here to recover them. It boils down to executing the following command:

usermod -G adm,cdrom,sudo,dip,plugdev,lpadmin,guoshicheng,vboxusers myusername

View more solutions

Comments

[R9TySix]

@Caesium Thank u. Thanks all :) Solved by following Caesium's solution :D

[Caesium]

Then you should fix the accepted answer, currently a non-working solution is accepted which will confuse future visitors.

[Bruno Pereira]

That will add a new user and make the user belong only to those groups.

[Caesium]

If that's so, then Oli's answer is wrong too?

[Caesium]

Exactly equivalent to -aG group (assuming usermod knows how to parse args)

[keram]

puts value.class gives me String :/, puts digit.content.class is String too. Maybe wikipedia has some kind of parsing protection? I try to parse: pl.wikipedia.org/wiki/Miasta_w_Polsce_(statystyki) (5th column values)

[keram]

Ooops I totally forget about   Thanks.

[bender]

Welcome to Ask Ubuntu! The question's author already used the command you're telling him not to use. He has also already accepted a solution for his problem. There is actually no point in anwering the question again. And linking to a site in Chinese is also not very helpful on an English site.

[Symin]

@bender Actually there is a point if the answer is valid and on topic. Accepting answer means that it worked for the OP. Please read the about page.

[bender]

@Symin: Nevertheless, the question's author already used this command. Strictly seen, this is already not an answer to the question. The accepted answer already describes in detail what has been done wrong and why, this answer adds (almost) no new information. And describing (once again) how to get back lost privileges has been done many many many times on this site. And just for the sake of completeness, this command won't work any more after sudo privileges were lost (unless one hasn't logged off yet or still has an open root shell).

[Edward Torvalds]

i am getting error: usermod: group 'vboxusers' does not exist