An item that provides click-through is one that a user can activate with one click, even though the item is in an inactive window. (To activate an item that does not support click-through, the user must first make the containing window active and then click the item.) Although click-through can make some user tasks easier, it can also confuse users if they click items unintentionally.
Click-through is not a property of a class of controls; any control, including toolbar items, can support click-through. This also means that you can support click-through for any subset of items; you don’t have to choose between supporting click-through for all items in a window or none. Follow the guidelines in this section so that you can support click-through when it’s appropriate.
Avoid providing click-through for an item or action whose result might be dangerous or undesirable. Specifically, avoid enabling click-through for an item that:
Performs a potentially harmful action that users can’t cancel (for example, the Delete button in Mail)
Performs an action that is difficult or impossible to cancel (such as the Send button in Mail)
Dismisses a dialog without telling the user what action was taken (for example, the Save button in a Save dialog that overwrites an existing file and automatically dismisses the dialog)
Removes the user from the current context (for example, selecting a new item in a Finder column that changes the target of the Finder window)
Clicking in any one of these situations should cause the window that contains the item to be brought forward, but no other action to be taken.
In general, it’s safe to provide click-through for an item that asks the user for confirmation before executing, even if the command ultimately results in destruction of data. For example, you can provide click-through for a delete button if you also make sure to give users the opportunity to cancel or confirm the action before it proceeds.
Think twice before supporting click-through for items that don’t provide confirmation feedback. Specifically, consider how dangerous the action might be, and determine how difficult it will be for the user to undo the action after it’s performed. For example, the Mail Delete button does not provide click-through because it deletes a message without asking for confirmation, which is a potentially harmful action that can be difficult to undo. On the other hand, click-through for the New button in Mail is fine because its resulting action is not harmful and is easy to undo.
Ensure that items that don’t support click-through appear disabled when their window is inactive. The disabled appearance helps users understand that these controls are unavailable. For example, the Delete and Mark as Junk buttons in the inactive Mail window shown below don’t support click-through.
logging – Where is “/var/log/messages” on mac-osx? – Server Fault
TL;DR: because most of it is in /var/log/system.log which is configured in /etc/asl.conf, but the documentation example about syslog.conf never got updated.
NAME
asl.conf -- configuration file for syslogd(8) and aslmanager(8)
DESCRIPTION
The syslogd(8) server reads the /etc/asl.conf file at startup, and re-reads the file when it receives a HUP signal. The aslmanager(8) daemon reads the file when it starts. See the
ASLMANAGER PARAMETER SETTINGS section for details on aslmanager-specific parameters.
When you read the man pages on Mac OS X, there are references to /var/log/messages, but if you look for the file, it doesn’t exist:
$ ls -l /var/log/messages
ls: /var/log/messages: No such file or directory
A:
2009 era: If you look at the actual /etc/syslog.conf instead of the man page, you see *.notice;authpriv,remoteauth,ftp,install.none;kern.debug;mail.crit /var/log/system.log
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The Wiert Corner - irregular stream of stuff 