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Add a user with root privileges on a linux system running busybox

The problem with busybox is that it doesn't support a whole bunch of useful stuff that would help in this situation, such as sudo, and therefore the wheel solution proposed in other posts, in /etc/sudoers, can't be done. Likewise, usermod is not available, and even adduser -u 0 doesn't work because it complains that "UID 0 is already used".

What you have to do is simple:

  • adduser user
  • vi /etc/passwd and modify the uid of user.

    /etc/passwd will look something like this:

    root:x:0:0:root:/home:/bin/sh
    daemon:x:1:1:daemon:/usr/sbin:/bin/sh
    sampleUser:x:1000:1000:Linux User,,,:/home/sampleUser:/bin/sh

    to give sampleUser root privileges, edit like this:

    sampleUser:x:0:0:Linux User,,,:/home/sampleUser:/bin/sh

    I.e. set sampleUser's uid = 0

Done.

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