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I want to create a user in such a way that it can create a file and update the contents of the file.

useradd username

Now for sudo, we can create username and linking to sudo like below: 

useradd username sudo

But I dont want to give sudo access. Without sudo access, I am unable to create files and update files.

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  • If you don't want to give sudo privilege, then don't give sudo privilege (don't add user to group, sudo). All users can create, write, read files.
    – ctrl-alt-delor
    Jul 19, 2016 at 8:08

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Depending on what files you want, you can create a new group (/etc/group) and make the file writable (and the directory containing it if you want the user to create new files) by that group (e.g., chgrp <groupname> <file>; chmod g+w <file>

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