What does option g is ambiguous mean in linux ?

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Write a program in C to mimic the "adduser" command on Linux. This command will add either an ordinary user or a system user. It has to handle 2 files "passwd" and "shadow". Both these files will be in some folder specified by an environment variable PFILE. The program has to take all arguments as command line arguments

for the above question i have very hardly done some research and done some coding .
code is of no errors .
but when i try to add user using command like ...

adduser –u 100 –g 200 –c "M S DHONI"msdhoni

it gives me option g is ambiguous .
can anyone tell me what is wrong

What I have tried:

I have tried to research about what is option g is ambiguous but could not find anything

Posted 17-May-20 5:35am

Member 14830575

Updated 18-May-20 20:30pm

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Rick York 17-May-20 12:15pm

Yes : your program does not work right.

3 solutions

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k5054 · Answer 1 · 2020-05-17T05:47:00

Solution 1

Check the man page for adduser on your system. On Fedora31 system, -g adds the user to the (already defined) group given. On my raspbian system (debian based, so probably the same for other debian based systems i.e. ubuntu), -g is not an option, but --gid is.

Posted 17-May-20 5:47am

k5054

phil.o · Answer 2 · 2020-05-17T05:48:00

Solution 2

Linux adduser and addgroup commands help and examples[^]
There is no -g flag to adduser command. There is a -gid flag to put the new user into the group with specified id, and there is a -group flag to create a group with the same name as the user.

You should always refer to documentation for this kind of issues.

Posted 17-May-20 5:48am

phil.o

Comments

Member 14830575 18-May-20 1:31am

can you tell me what should be the command for adding newuser?
instead of the below command what should be the command?
adduser –u 100 –g 200 –c “M S DHONI”msdhoni -

phil.o 18-May-20 3:48am

Everything is explained on the link I provided. You can also type

man adduser

to get syntax and usage examples. There also exists an useradd command accepting -g as option. Check it with

man useradd

Member 14830575 19-May-20 4:01am

useradd –u 100 –g 200 –c “M S DHONI”msdhoni - I TRIED THIS AND I GOT group does not exist on the screen

Andy Allinger · Answer 3 · 2020-05-18T20:31:00

Solution 3

Did you name your program adduser? Maybe you need to name it something else. Try

which adduser

Posted 18-May-20 20:31pm

Andy Allinger