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Top Forums Shell Programming and Scripting Calculate age of a file | calculate time difference Post 302495956 by methyl on Friday 11th of February 2011 04:20:26 PM
Old 02-11-2011
AlphaLexman is correct. The "last modified" timestamp is the most useful and is the one used by "ls -la" and "find -mtime" etc..
The "-ctime" timestamp is the timestamp when the inode was last changed. Some backup software changes this timestamp to mark the file "backed up".

Earlier I was trying to avoid the epoch date arithmetic or writing a "C" or "perl" (or whatever) program.

There are many techniques to find files which are less than 20 minutes old even if you don't have the GNU version of "find" - which offers this sort of search as standard.

Let's find out what you are trying to do in more detail.
 

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pam_timestamp(8)					   System Administrator's Manual					  pam_timestamp(8)

NAME
pam_timestamp - authenticate using cached successful authentication attempts SYNOPSIS
auth sufficient /lib/security/pam_timestamp.so session optional /lib/security/pam_timestamp.so DESCRIPTION
In a nutshell, pam_timestamp caches successful authentication attempts, and allows you to use a recent successful attempt as the basis for authentication. When an application opens a session using pam_timestamp, a timestamp file is created in the timestampdir directory for the user. When an application attempts to authenticate the user, a pam_timestamp will treat a sufficiently- recent timestamp file as grounds for succeeding. ARGUMENTS
debug turns on debugging via syslog(3). timestampdir=name tells pam_timestamp.so where to place and search for timestamp files. This should match the directory configured for sudo(1) in the sudoers(5) file. timestamp_timeout=number tells pam_timestamp.so how long it should treat timestamp files as valid after their last modification date. This should match the value configured for sudo(1) in the sudoers(5) file. verbose attempt to inform the user when access is granted. EXAMPLE
/etc/pam.d/some-config-tool: auth sufficient /lib/security/pam_timestamp.so verbose auth required /lib/security/pam_unix.so session required /lib/security/pam_permit.so session optional /lib/security/pam_timestamp.so CAVEATS
Users can get confused when they aren't always asked for passwords when running a given program. Some users reflexively begin typing information before noticing that it's not being asked for. SEE ALSO
pam_timestamp_check(8) BUGS
Let's hope not, but if you find any, please email the author. AUTHOR
Nalin Dahyabhai <nalin@redhat.com> Red Hat Linux 2002/02/07 pam_timestamp(8)
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