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There are a few commands for changing various
properties of an account (i.e., the relevant field
Change the full name field.
Change the login shell.
Change the password.
Other tasks need to be done by hand. For example, to
change the username, you need to edit
directly (with vipw, remember). Likewise, to add
or remove the user to more groups, you need to edit
/etc/group (with vigr). Such
tasks tend to
be rare, however, and should be done with caution: for
you change the username, e-mail will no longer reach the
user, unless you also create a mail alias.
The user's name might change due to marriage, for example, and he might want to have his username reflect his new name.
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