NAME

ckuid - prompts for and validates a user ID

SYNOPSIS

ckuid [-Q] [-W width] [-m] [-d default] [-h help] [-e error]
[-p prompt]
[-k pid [-s signal]]

erruid [-W] [-e error]
helpuid [-W] [-m] [-h help]
valuid input

DESCRIPTION

ckuid prompts a user and validates the response. It defines, among other things, a prompt message whose response should be an existing user ID, text for help and error messages, and a default value (which will be returned if the user responds with a carriage return). All messages are limited in length to 70 characters and are formatted automatically. Any white space used in the definition (including newline) is stripped. The -W option cancels the automatic formatting. When a tilde is placed at the beginning or end of a message definition, the default text will be inserted at that point, allowing both custom text and the default text to be displayed. If the prompt, help or error message is not defined, the default message (as defined under NOTES) will be displayed. Three visual tool modules are linked to the ckuid command. They are erruid (which formats and displays an error message), helpuid (which formats and displays a help message), and valuid (which validates a response). These modules should be used in conjunction with FML objects. In this instance, the FML object defines the prompt. The options and arguments for this command are:

-Q Specifies that quit will not be allowed as a valid response.

-W Specifies that prompt, help and error messages will be formatted to a line length of width.

-m Displays a list of all logins when help is requested or when the user makes an error.

-d Defines the default value as default. The default is not validated and so does not have to meet any criteria.

-h Defines the help messages as help.

-e Defines the error message as error.

-p Defines the prompt message as prompt.

-k Specifies that process ID pid is to be sent a signal if the user chooses to abort.

-s Specifies that the process ID pid defined with the -k option is to be sent signal signal when quit is chosen. If no signal is specified, SIGTERM is used.

input

Input to be verified against /etc/passwd.

EXIT CODES

0 = Successful execution
1 = EOF on input
2 = Usage error
3 = User termination (quit)

NOTES

The default prompt for ckuid is:

Enter the login name of an existing user [?,q]:

The default error message is:

ERROR - Please enter the login name of an existing user.
Select the help option (?) for a list of valid login names.
(Last line appears only if the -m option of ckuid is used)

The default help message is:

   Please enter the login name of an existing user.
   (If the -m option of ckuid is used, a list of  valid  groups
   is also displayed.)
When the quit option is chosen (and  allowed),  q  is  returned
along  with the return code 3.  The valuid module will not pro-
duce any output.  It returns zero for success and non-zero  for
failure.