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Unable to create new user without lower character

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Top Forums UNIX for Beginners Questions & Answers Unable to create new user without lower character
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Old 06-23-2017
I've not had an issue with all capital letter users either, except on the console. There I would fail a login using any random lower-case characters and then you can login with the one you want.

I ran AIX, Solaris (2.5 to v8), HP-UX 11.11, Dynix 4 and RHEL 5 & 6 quite happily like this. Our application required all capitals because it was originally grown on an IBM mainframe running VM/XA & MVS/ESA (gosh I'm old! Smilie) and they assumed every user account was only capitals.



Login over the network seemed never to be a problem. Are we worried about users defined in LDAP / AD perhaps etc.? We'd gone away from user login to the server by that point so they logged in to the application instead.


Robin
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LEARN ABOUT REDHAT

adduser

USERADD(8)						      System Manager's Manual							USERADD(8)

NAME

       useradd - Create a new user or update default new user information

SYNOPSIS

       useradd [-c comment] [-d home_dir]
	       [-e expire_date] [-f inactive_time]
	       [-g initial_group] [-G group[,...]]
	       [-m [-k skeleton_dir] | -M] [-n] [-o] [-p passwd] [-r]
	       [-s shell] [-u uid] login

       useradd -D [-g default_group] [-b default_home]
	       [-e default_expire_date] [-f default_inactive]
	       [-s default_shell]

DESCRIPTION

   Creating New Users
       When  invoked  without the -D option, the useradd command creates a new user account using the values specified on the command line and the
       default values from the system.	The new user account will be entered into the system files as needed, the home directory will be  created,
       and initial files copied, depending on the command line options.  The version provided with Red Hat Linux will create a group for each user
       added to the system, unless the -n option is given.  The options which apply to the useradd command are:

       -c comment
	      The new user's password file comment field.

       -d home_dir
	      The new user will be created using home_dir as the value for the user's login directory.	The default is to append the login name to
	      default_home and use that as the login directory name.

       -e expire_date
	      The date on which the user account will be disabled.  The date is specified in the format YYYY-MM-DD.

       -f inactive_days
	      The number of days after a password expires until the account is permanently disabled.  A value of 0 disables the account as soon as
	      the password has expired, and a value of -1 disables the feature.  The default value is -1.

       -g initial_group
	      The group name or number of the user's initial login group.  The group name must exist.  A group number must  refer  to  an  already
	      existing group.  The default group number is 1 or whatever is specified in /etc/default/useradd.

       -G group,[...]
	      A list of supplementary groups which the user is also a member of.  Each group is separated from the next by a comma, with no inter-
	      vening whitespace.  The groups are subject to the same restrictions as the group given with the -g option.  The default is  for  the
	      user to belong only to the initial group.

       -m     The  user's  home  directory  will  be created if it does not exist.  The files contained in skeleton_dir will be copied to the home
	      directory if the -k option is used, otherwise the files contained in /etc/skel will be used instead.  Any directories  contained	in
	      skeleton_dir or /etc/skel will be created in the user's home directory as well.  The -k option is only valid in conjunction with the
	      -m option.  The default is to not create the directory and to not copy any files.

       -M     The user home directory will not be created, even if the system wide settings from /etc/login.defs is to create home dirs.

       -n     A group having the same name as the user being added to the system will be created by default. This option will turn  off  this  Red
	      Hat Linux specific behavior.

       -o     Allow create user with duplicate (non-unique) UID.

       -p passwd
	      The encrypted password, as returned by crypt(3).	The default is to disable the account.

       -r     This  flag is used to create a system account. That is, a user with a UID lower than the value of UID_MIN defined in /etc/login.defs
	      and whose password does not expire. Note that useradd will not create a home directory for such an user, regardless of  the  default
	      setting in /etc/login.defs.  You have to specify -m option if you want a home directory for a system account to be created.  This is
	      an option added by Red Hat.

       -s shell
	      The name of the user's login shell.  The default is to leave this field blank, which causes the system to select the  default  login
	      shell.

       -u uid The  numerical  value  of  the user's ID.  This value must be unique, unless the -o option is used.  The value must be non-negative.
	      The default is to use the smallest ID value greater than 99 and greater than every other user.  Values between 0 and  99	are  typi-
	      cally reserved for system accounts.

   Changing the default values
       When  invoked  with  the  -D  option, useradd will either display the current default values, or update the default values from the command
       line.  The valid options are

       -b default_home
	      The initial path prefix for a new user's home directory.	The user's name will be affixed to the end of default_home to  create  the
	      new directory name if the -d option is not used when creating a new account.

       -e default_expire_date
	      The date on which the user account is disabled.

       -f default_inactive
	      The number of days after a password has expired before the account will be disabled.

       -g default_group
	      The  group  name	or  ID for a new user's initial group.	The named group must exist, and a numerical group ID must have an existing
	      entry .

       -s default_shell
	      The name of the new user's login shell.  The named program will be used for all future new user accounts.

       If no options are specified, useradd displays the current default values.

NOTES

       The system administrator is responsible for placing the default user files in the /etc/skel directory.
       This version of useradd was modified by Red Hat to suit Red Hat user/group conventions.

CAVEATS

       You may not add a user to an NIS group.	This must be performed on the NIS server.

FILES

       /etc/passwd - user account information
       /etc/shadow - secure user account information
       /etc/group - group information
       /etc/gshadow - secure group information
       /etc/default/useradd - default information
       /etc/login.defs - system-wide settings
       /etc/skel - directory containing default files

SEE ALSO

       chfn(1), chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8), userdel(8), usermod(8)

AUTHOR

       Julianne Frances Haugh (jockgrrl@ix.netcom.com)

																	USERADD(8)