Usermod and history output

up vote
1
down vote

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I used usermod -G without the -a option, now the main user has only 2 groups. I want to restore all the previous groups but the problem is that i need to list all the groups before the changes

I am trying to use

locate /etc/groups

and grep username in the previous version of the file to get all the previous group

How can I access to the file from the db and read them ?

edited May 15 at 15:52

asked May 15 at 15:14

eDen

379

Possible duplicate of Default groups for user in Ubuntu?
â€“Â muru
May 15 at 15:46

And you'll probably need askubuntu.com/q/70442/158442 as well to get back your lost sudo rights.
â€“Â muru
May 15 at 15:46

1

Possible duplicate of How do I add myself back as a sudo user?
â€“Â karel
May 15 at 21:03

add a commentÂ |Â

up vote
1
down vote

favorite

I used usermod -G without the -a option, now the main user has only 2 groups. I want to restore all the previous groups but the problem is that i need to list all the groups before the changes

I am trying to use

locate /etc/groups

and grep username in the previous version of the file to get all the previous group

How can I access to the file from the db and read them ?

edited May 15 at 15:52

asked May 15 at 15:14

eDen

379

Possible duplicate of Default groups for user in Ubuntu?
â€“Â muru
May 15 at 15:46

And you'll probably need askubuntu.com/q/70442/158442 as well to get back your lost sudo rights.
â€“Â muru
May 15 at 15:46

1

Possible duplicate of How do I add myself back as a sudo user?
â€“Â karel
May 15 at 21:03

add a commentÂ |Â

up vote
1
down vote

favorite

I used usermod -G without the -a option, now the main user has only 2 groups. I want to restore all the previous groups but the problem is that i need to list all the groups before the changes

I am trying to use

locate /etc/groups

and grep username in the previous version of the file to get all the previous group

How can I access to the file from the db and read them ?

edited May 15 at 15:52

asked May 15 at 15:14

eDen

379

I used usermod -G without the -a option, now the main user has only 2 groups. I want to restore all the previous groups but the problem is that i need to list all the groups before the changes

I am trying to use

locate /etc/groups

and grep username in the previous version of the file to get all the previous group

How can I access to the file from the db and read them ?

edited May 15 at 15:52

asked May 15 at 15:14

eDen

379

edited May 15 at 15:52

asked May 15 at 15:14

eDen

379

asked May 15 at 15:14

eDen

379

asked May 15 at 15:14

eDen

379

Possible duplicate of Default groups for user in Ubuntu?
â€“Â muru
May 15 at 15:46

And you'll probably need askubuntu.com/q/70442/158442 as well to get back your lost sudo rights.
â€“Â muru
May 15 at 15:46

1

Possible duplicate of How do I add myself back as a sudo user?
â€“Â karel
May 15 at 21:03

add a commentÂ |Â

Possible duplicate of Default groups for user in Ubuntu?
â€“Â muru
May 15 at 15:46

And you'll probably need askubuntu.com/q/70442/158442 as well to get back your lost sudo rights.
â€“Â muru
May 15 at 15:46

1

Possible duplicate of How do I add myself back as a sudo user?
â€“Â karel
May 15 at 21:03

Possible duplicate of Default groups for user in Ubuntu?
â€“Â muru
May 15 at 15:46

And you'll probably need askubuntu.com/q/70442/158442 as well to get back your lost sudo rights.
â€“Â muru
May 15 at 15:46

Possible duplicate of How do I add myself back as a sudo user?
â€“Â karel
May 15 at 21:03

add a commentÂ |Â

1 Answer
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1
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There is no /etc/groups. There's /etc/group and /etc/group- (the backup). To get results for your user from the backup, you can do:

grep username /etc/group-

Or, to get just the groups, using awk:

awk -F: -v u=username '$NF ~ u print $1' /etc/group-

To then add those groups back, as root:

awk -F: -v u=username '$NF ~ u print $1' /etc/group- |
 xargs -n1 gpasswd -a username

answered May 15 at 16:04

muru

129k19271460

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1 Answer
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active

oldest

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1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

There is no /etc/groups. There's /etc/group and /etc/group- (the backup). To get results for your user from the backup, you can do:

grep username /etc/group-

Or, to get just the groups, using awk:

awk -F: -v u=username '$NF ~ u print $1' /etc/group-

To then add those groups back, as root:

awk -F: -v u=username '$NF ~ u print $1' /etc/group- |
 xargs -n1 gpasswd -a username

answered May 15 at 16:04

muru

129k19271460

add a commentÂ |Â

up vote
1
down vote

accepted

There is no /etc/groups. There's /etc/group and /etc/group- (the backup). To get results for your user from the backup, you can do:

grep username /etc/group-

Or, to get just the groups, using awk:

awk -F: -v u=username '$NF ~ u print $1' /etc/group-

To then add those groups back, as root:

awk -F: -v u=username '$NF ~ u print $1' /etc/group- |
 xargs -n1 gpasswd -a username

answered May 15 at 16:04

muru

129k19271460

add a commentÂ |Â

up vote
1
down vote

accepted

There is no /etc/groups. There's /etc/group and /etc/group- (the backup). To get results for your user from the backup, you can do:

grep username /etc/group-

Or, to get just the groups, using awk:

awk -F: -v u=username '$NF ~ u print $1' /etc/group-

To then add those groups back, as root:

awk -F: -v u=username '$NF ~ u print $1' /etc/group- |
 xargs -n1 gpasswd -a username

answered May 15 at 16:04

muru

129k19271460

There is no /etc/groups. There's /etc/group and /etc/group- (the backup). To get results for your user from the backup, you can do:

grep username /etc/group-

Or, to get just the groups, using awk:

awk -F: -v u=username '$NF ~ u print $1' /etc/group-

To then add those groups back, as root:

awk -F: -v u=username '$NF ~ u print $1' /etc/group- |
 xargs -n1 gpasswd -a username

answered May 15 at 16:04

muru

129k19271460

answered May 15 at 16:04

muru

129k19271460

answered May 15 at 16:04

muru

129k19271460

answered May 15 at 16:04

muru

129k19271460

add a commentÂ |Â

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