04-25-2007
"vi"-ing a constantly updated file
Hi,
A bit of a dumb question here. Sorry folks.
Suppose I have this file which is being updated at irregular intervals (a few seconds, a few minutes, who knows) by a background process.
I 'vi' this file with the intention of editing it, so it opens up a temp copy as the usual /tmp/720cwhatever
Now suppose, whilst I have this file opened, its updated several times by the background process.
I make my changes, save-quit.
What happens to the updates that were made by the background process during the time I had the file opened?
How do I mitigate this?
(unfortunately, stopping the background process is not an option).
The file is fairly big also (about 40Mb) so it takes vi a few seconds to load it up, save to it etc.....
Unix is ksh.
OS is SunOS.
Hope you guys can help! - thanks in advance!
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shell(1F) FMLI Commands shell(1F)
NAME
shell - run a command using shell
SYNOPSIS
shell command [command] ...
DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
/usr/bin/sh).
EXAMPLES
Example 1: A sample output of shell command.
Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.
`shell "build prog > /dev/null &"`
If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe-
cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to
save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing.
shell can also be used to execute a command that has the same name as an FMLI built-in function.
NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments
will not be expanded by the shell because "local" means "local to the current process."
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
sh(1), attributes(5)
SunOS 5.10 5 Jul 1990 shell(1F)