08-20-2008
The answer depends on your filesystem. Older filesystems UFS, ext2, etc do not store this information. Most of the newer filesystems do keep this information somewhere within their metadata, e.g. ext4 in crtime (creation timestamp), UFS2 in di_birthdate.
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LEARN ABOUT CENTOS
pam_timestamp_check
PAM_TIMESTAMP_CHECK(8) Linux-PAM Manual PAM_TIMESTAMP_CHECK(8)
NAME
pam_timestamp_check - Check to see if the default timestamp is valid
SYNOPSIS
pam_timestamp_check [-k] [-d] [target_user]
DESCRIPTION
With no arguments pam_timestamp_check will check to see if the default timestamp is valid, or optionally remove it.
OPTIONS
-k
Instead of checking the validity of a timestamp, remove it. This is analogous to sudo's -k option.
-d
Instead of returning validity using an exit status, loop indefinitely, polling regularly and printing the status on standard output.
target_user
By default pam_timestamp_check checks or removes timestamps generated by pam_timestamp when the user authenticates as herself. When the
user authenticates as a different user, the name of the timestamp file changes to accommodate this. target_user allows to specify this
user name.
RETURN VALUES
0
The timestamp is valid.
2
The binary is not setuid root.
3
Invalid invocation.
4
User is unknown.
5
Permissions error.
6
Invalid controlling tty.
7
Timestamp is not valid.
NOTES
Users can get confused when they are not always asked for passwords when running a given program. Some users reflexively begin typing
information before noticing that it is not being asked for.
EXAMPLES
auth sufficient pam_timestamp.so verbose
auth required pam_unix.so
session required pam_unix.so
session optional pam_timestamp.so
FILES
/var/run/sudo/...
timestamp files and directories
SEE ALSO
pam_timestamp_check(8), pam.conf(5), pam.d(5), pam(8)
AUTHOR
pam_tally was written by Nalin Dahyabhai.
Linux-PAM Manual 09/19/2013 PAM_TIMESTAMP_CHECK(8)