06-03-2010
Also, "." should never be in your PATH anyway.
This prevents a situation where someone can put a file named, for example, "ls" in their own home directory, which contains commands only root can execute, and have you unknowingly execute it as root (by simply typing "ls").
So, you should always be referencing your scripts with either ./ or full path.
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LEARN ABOUT REDHAT
update
update(n) Tcl Built-In Commands update(n)
__________________________________________________________________________________________________________________________________________________
NAME
update - Process pending events and idle callbacks
SYNOPSIS
update ?idletasks?
_________________________________________________________________
DESCRIPTION
This command is used to bring the application ``up to date'' by entering the event loop repeatedly until all pending events (including idle
callbacks) have been processed.
If the idletasks keyword is specified as an argument to the command, then no new events or errors are processed; only idle callbacks are
invoked. This causes operations that are normally deferred, such as display updates and window layout calculations, to be performed imme-
diately.
The update idletasks command is useful in scripts where changes have been made to the application's state and you want those changes to
appear on the display immediately, rather than waiting for the script to complete. Most display updates are performed as idle callbacks,
so update idletasks will cause them to run. However, there are some kinds of updates that only happen in response to events, such as those
triggered by window size changes; these updates will not occur in update idletasks.
The update command with no options is useful in scripts where you are performing a long-running computation but you still want the applica-
tion to respond to events such as user interactions; if you occasionally call update then user input will be processed during the next
call to update.
SEE ALSO
after(n), bgerror(n)
KEYWORDS
event, flush, handler, idle, update
Tcl 7.5 update(n)