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Top Forums UNIX for Dummies Questions & Answers "vi"-ing a constantly updated file Post 302115554 by Percy on Wednesday 25th of April 2007 12:28:32 PM
Old 04-25-2007
OK cheers guys!

A bit more info:

What exactly I want to do is this:

This is a big file, full of filenames and a hashcode for each filename.
each line in the file is
filename, date, hashcode
filename, date, hashcode
...

Anyway, so a file comes into a server, gets a hashcode which is then put into this big log file of mine, and then the file is processed.

Should the file be sent in again to the server, its hashcode is checked and if it exists (ie, my process has dealt with it already) it deals with the file appropriately.

I come unstuck when I need to reprocess the same file again - so I need to edit the large log file and remove the entry (the whole line - name,date,hashcode) so that I can feed it through again.


Write a sh to deal with this? - not sure - its one of those where it happens often, but not often enough to justify a sh....but its something I guess I could look into.


One other thing:

Suppose two people sudos to a user (the same user) first, and then edits the file - you don't get the message about the file changing when you save/quit right? - at least that's what it appears to happen over here in bizarro world...
 

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CHGRP(3)								 1								  CHGRP(3)

chgrp - Changes file group

SYNOPSIS
bool chgrp (string $filename, mixed $group) DESCRIPTION
Attempts to change the group of the file $filename to $group. Only the superuser may change the group of a file arbitrarily; other users may change the group of a file to any group of which that user is a member. PARAMETERS
o $filename - Path to the file. o $group - A group name or number. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Changing a file's group <?php $filename = 'shared_file.txt'; $format = "%s's Group ID @ %s: %d "; printf($format, $filename, date('r'), filegroup($filename)); chgrp($filename, 8); clearstatcache(); // do not cache filegroup() results printf($format, $filename, date('r'), filegroup($filename)); ?> NOTES
Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note When safe mode is enabled, PHP checks whether the files or directories being operated upon have the same UID (owner) as the script that is being executed. SEE ALSO
chown(3), chmod(3). PHP Documentation Group CHGRP(3)
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