11-25-2013
Quote:
As per my understanding ,since these commands wont give any output, you are getting a zero byte file.
I believe you are looking for some kind of tracking to know what has happened with the files -- audit any changes made on the file.
I am not sure if there is any command that let us do this audit trail, but on googling i found the below link, may be you can take a look to get some idea,
http://www.cyberciti.biz/tips/linux-...to-a-file.html
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audit(1M) audit(1M)
NAME
audit - control the behavior of the audit daemon
SYNOPSIS
audit -n | -s | -t | -v [path]
The audit command is the system administrator's interface to maintaining the audit trail. The audit daemon can be notified to read the con-
tents of the audit_control(4) file and re-initialize the current audit directory to the first directory listed in the audit_control file or
to open a new audit file in the current audit directory specified in the audit_control file, as last read by the audit daemon. Reading
audit_control also causes the minfree and plugin configuration lines to be re-read and reset within auditd. The audit daemon can also be
signaled to close the audit trail and disable auditing.
-n Notify the audit daemon to close the current audit file and open a new audit file in the current audit directory.
-s Notify the audit daemon to read the audit control file. The audit daemon stores the information internally. If the audit daemon is
not running but audit has been enabled by means of bsmconv(1M), the audit daemon is started.
-t Direct the audit daemon to close the current audit trail file, disable auditing, and die. Use -s to restart auditing.
-v path Verify the syntax for the audit control file stored in path. The audit command displays an approval message or outputs specific
error messages for each error found.
The audit command will exit with 0 upon success and a positive integer upon failure.
/etc/security/audit_user
/etc/security/audit_control
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Stability |Evolving |
+-----------------------------+-----------------------------+
bsmconv(1M), praudit(1M), audit(2), audit_control(4), audit_user(4), attributes(5)
The functionality described in this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for
more information.
The audit command does not modify a process's preselection mask. It functions are limited to the following:
o affects which audit directories are used for audit data storage;
o specifies the minimum free space setting;
o resets the parameters supplied by means of the plugin directive.
For the -s option, audit validates the audit_control syntax and displays an error message if a syntax error is found. If a syntax error
message is displayed, the audit daemon does not re-read audit_control. Because audit_control is processed at boot time, the -v option is
provided to allow syntax checking of an edited copy of audit_control. Using -v, audit exits with 0 if the syntax is correct; otherwise, it
returns a positive integer.
The -v option can be used in any zone, but the -t, -s, and -n options are valid only in local zones and, then, only if the perzone audit
policy is set. See auditd(1M) and auditconfig(1M) for per-zone audit configuration.
25 May 2004 audit(1M)