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Top Forums UNIX for Dummies Questions & Answers Unix user ID's case-sensitive? Post 45055 by Perderabo on Sunday 14th of December 2003 06:02:24 PM
Old 12-14-2003
This is actually a difficult question. My answer is that I would never depend on being able to create two accounts like daveb and daveB. And as a system admininistrator I would prohibit it on all systems that I administer. But as a programmer, I would insure that programs work correctly iif two such accounts are encountered.

Neo mentions mail and that is correct. Internet mail must ignore case and so daveb@xyz.org and daveB@xyz.org are the same address. The mail problem would not be impossible to solve but it would be very hard. One of the accounts will need an external mail address that doesn't match the user name. This may require writing a custom delivery agent. I suspect that "mailx Neo" and "mailx neo" would both work. But if it doesn't work, I certainly would not want to call the vendor and complain. And in any case, "mailx neo@localhost" and "mailx Neo@localhost" could not both work.

I'm dating myself here, but terminals originally were not multicase. They were upper case only. Unix had support for that environment. It is mostly gone, but some versions still have various pieces left. On HP-UX, if you sign on as DAVEB, the system will assume that you meant daveb and that you are using a terminal that cannot handle lower case.

Because of these problems, many adduser programs will disallow this sort of thing. But if you manually edit the passwd file, you will probably succeed in getting it to work.

So don't do that, you will regret it. But don't assume that no one else has done it. And be aware that many programmers have assumed that no one has done it.
 

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XDG-EMAIL(1)															      XDG-EMAIL(1)

NAME
xdg-email - command line tool for sending mail using the user's preferred e-mail composer SYNOPSIS
xdg-email [--utf8] [--cc address] [--bcc address] [--subject text] [--body text] [--attach file] [mailto-uri address(es)] xdg-email {--help --manual --version} DESCRIPTION
xdg-email opens the user's preferred e-mail composer in order to send a mail to address(es) or mailto-uri. RFC2368 defines mailto: URIs. xdg-email limits support to, cc, subject and body fields in mailto-uri, all other fields are silently ignored. address(es) must follow the syntax of RFC822. Multiple addresses may be provided as separate arguments. All information provided on the command line is used to prefill corresponding fields in the user's e-mail composer. The user will have the opportunity to change any of this information before actually sending the e-mail. xdg-email is for use inside a desktop session only. It is not recommended to use xdg-email as root. See http://portland.freedesktop.org/EmailConfig for information on how the user can change the e-mail composer that is used. OPTIONS
--utf8 Indicates that all command line options that follow are in utf8. Without this option, command line options are expected to be encoded according to locale. If the locale already specifies utf8 this option has no effect. This option does not affect mailto URIs that are passed on the command line. --cc address Specify a recipient to be copied on the e-mail. --bcc address Specify a recipient to be blindly copied on the e-mail. --subject text Specify a subject for the e-mail. --body text Specify a body for the e-mail. Since the user will be able to make changes before actually sending the e-mail, this can be used to provide the user with a template for the e-mail. text may contain linebreaks. --attach file Specify an attachment for the e-mail. file must point to an existing file. Some e-mail applications require the file to remain present after xdg-email returns. --help Show command synopsis. --manual Show this manualpage. --version Show the xdg-utils version information. ENVIRONMENT VARIABLES
xdg-email honours the following environment variables: XDG_UTILS_DEBUG_LEVEL Setting this environment variable to a non-zero numerical value makes xdg-email do more verbose reporting on stderr. Setting a higher value increases the verbosity. EXIT CODES
An exit code of 0 indicates success while a non-zero exit code indicates failure. The following failure codes can be returned: 1 Error in command line syntax. 2 One of the files passed on the command line did not exist. 3 A required tool could not be found. 4 The action failed. 5 No permission to read one of the files passed on the command line. CONFIGURATION
Visit http://portland.freedesktop.org/EmailConfig for information how to configure xdg-email to use the email client of your choice. EXAMPLES
xdg-email 'Jeremy White <jwhite@example.com>' xdg-email --attach /tmp/logo.png --subject 'Logo contest' --body 'Attached you find the logo for the contest.' 'jwhite@example.com' xdg-email --subject 'Your password is about to expire' 'jwhite@example.com' 'bastian@example.com' 'whipple@example.com' AUTHOR
Kevin Krammer, Jeremy White. <kevin.krammer@gmx.at> <jwhite@codeweavers.com> xdg-utils 1.0 06/24/2007 XDG-EMAIL(1)
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