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Top Forums UNIX for Beginners Questions & Answers Unable to create new user without lower character Post 302999590 by Don Cragun on Thursday 22nd of June 2017 09:42:48 PM
Old 06-22-2017
You can create an account with a user name that does not contain any lowercase letters, but that poor user will curse you every time they try to login if you do so. When you login to a UNIX system (such as Solaris release 10) with a user name that doesn't contain any lowercase letters, the system will assume that you are logging in from a device (such as a TTY Model 33 teletype) that only has uppercase letters. To login as BG0001, they will need to type in the string \B\G001 and any uppercase characters in their password will also have to be escaped. After they have successfully logged in (if they are able to do so), they'll need to use stty to tell the TTY subsystem that the terminal emulator they're using does understand both uppercase and lowercase letters. Then that user will need to remember the different possible modes they might be working in whenever they try to change their password, enter their user name, type commands into their shell, etc.

The automated scripts that set up new user accounts complain about uppercase only user names for a reason. I strongly encourage you to heed the warning provided by the useradd warnings.
This User Gave Thanks to Don Cragun For This Post:
 

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NWUSERLIST(1)							    nwuserlist							     NWUSERLIST(1)

NAME
nwuserlist - List Users logged in at a NetWare server SYNOPSIS
nwuserlist [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ] [ -a ] [ -q ] [ -f [ -d ] [ -D ] [ -t ]] DESCRIPTION
nwuserlist lists the users logged in at a NetWare server, together with their connection number and their login time. nwuserlist looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more informa- tion. Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons. OPTIONS
-h -h is used to print out a short help text. -S server server is the name of the server you want to use. -U user user is the user name to use for login. -P password password is the password to use for login. If neither -n nor -P are given, and the user has no open connection to the server, nwuserlist prompts for a password. -n -n should be given if no password is required for the login. -C By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off this conversion by -C. -a With option -a the IPX address of the station the user is logged in from is printed as well. -q With option -q object ID is printed in addition to user name. -f List also files opened by each connection. -d List detailed informations about each file. -D List DOS filename instead of filename which was used for opening. -t Show raw hexadecimal values in addition to human readable conversions. AUTHORS
nwuserlist was written by Volker Lendecke. See the Changes file of ncpfs for other contributors. nwuserlist 7/22/1996 NWUSERLIST(1)
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