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Full Discussion: Knowing when a different program modifies a file
Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302797473 by alister on Monday 22nd of April 2013 03:35:17 PM
Old 04-22-2013
Quote:
Originally Posted by hanson44
Just to make sure, I did the same test on syslog. If you edit syslog (normally not a good idea), wait a while for something to be appended, write and exit vi, the newly added content is not there. The original poster thought syslog stopped working only because the newly added content was overwritten with the original file when vi saved/exited.
If by "overwritten" you mean that the editor changed the file's contents, then you are wrong. If by "overwritten" you mean that the editor created a completely different file, then you are correct.

If an editor simply overwrites the file's contents, after the edit, syslog's new messages would continue to appear in the file.

If the messages cease to reach the named file, then the original file has been unlinked and replaced by a new file (a different inode) with the same name. Meanwhile, syslog is still happily logging to the original log file (now with no name).

The OP stated having to restart to resume logging. That would not be necessary if the file's inode had not changed.

Regards,
Alister
 

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LEARN ABOUT OSX

fsirand

fsirand(1M)						  System Administration Commands					       fsirand(1M)

NAME

       fsirand - install random inode generation numbers

SYNOPSIS

       fsirand [-p] special

DESCRIPTION

       fsirand installs random inode generation numbers on all the inodes on device special, and also installs a file system ID in the superblock.
       This helps increase the security of file systems exported by NFS.

       fsirand must be used only on an unmounted file system that has been checked with fsck(1M) The only exception is that it can be used on  the
       root file system in single-user mode, if the system is immediately re-booted afterwards.

OPTIONS

       -p	Print out the generation numbers for all the inodes, but do not change the generation numbers.

USAGE

       See largefile(5) for the description of the behavior of fsirand when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fsck(1M), attributes(5), largefile(5)

SunOS 5.10							    16 Sep 1996 						       fsirand(1M)
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