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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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XtSetSensitive(3)						   XT FUNCTIONS 						 XtSetSensitive(3)

NAME
XtSetSensitive, XtIsSensitive - set and check a widget's sensitivity state SYNTAX
void XtSetSensitive(Widget w, Boolean sensitive); Boolean XtIsSensitive(Widget w); ARGUMENTS
sensitive Specifies a Boolean value that indicates whether the widget should receive keyboard and pointer events. w Specifies the widget. DESCRIPTION
The XtSetSensitive function first calls XtSetValues on the current widget with an argument list specifying that the sensitive field should change to the new value. It then recursively propagates the new value down the managed children tree by calling XtSetValues on each child to set the ancestor_sensitive to the new value if the new values for sensitive and the child's ancestor_sensitive are not the same. XtSetSensitive calls XtSetValues to change sensitive and ancestor_sensitive. Therefore, when one of these changes, the widget's set_values procedure should take whatever display actions are needed (for example, greying out or stippling the widget). XtSetSensitive maintains the invariant that if parent has either sensitive or ancestor_sensitive False, then all children have ances- tor_sensitive False. The XtIsSensitive function returns True or False to indicate whether or not user input events are being dispatched. If both core.sensitive and core.ancestor_sensitive are True, XtIsSensitive returns True; otherwise, it returns False. SEE ALSO
X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface X Version 11 libXt 1.0.5 XtSetSensitive(3)
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