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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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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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