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Top Forums Shell Programming and Scripting Getting a relative timestamp from timestamp stored in a file Post 302517525 by vaibhavkorde on Wednesday 27th of April 2011 04:27:05 AM
Old 04-27-2011
Getting a relative timestamp from timestamp stored in a file

Hi,
I've a file in the following format
Code:
1999-APR-8 17:31:06     1500     3     45
1999-APR-8 17:31:15     1500     3     45
1999-APR-8 17:31:25     1500     3     45
1999-APR-8 17:31:30     1500     3     45
1999-APR-8 17:31:55     1500     3     45
1999-APR-8 17:32:06     1500     3     45

As you can see the file is sorted according to the timestamp.
I want the output in such a form that it will consist of relative timestamp in seconds for every timestamp in each line stored in a file.
For eg:
For above file the relative timestamp will be calculated w.r.t first timestamp.
Thus, the desired output would be
Code:
1999-APR-8 17:31:06     1500     3     45     0
1999-APR-8 17:31:15     1500     3     45     9
1999-APR-8 17:31:25     1500     3     45     19
1999-APR-8 17:31:30     1500     3     45     24
1999-APR-8 17:31:55     1500     3     45     49
1999-APR-8 17:32:06     1500     3     45     60

How can I deal with this?
Thanks in advance.
 

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libapache2-mod-perl2-2.0.7::docs::api::APR::OS(3pm)	User Contributed Perl Documentation    libapache2-mod-perl2-2.0.7::docs::api::APR::OS(3pm)

NAME
APR::OS - Perl API for Platform-specific APR API Synopsis use APR::OS (); # get current thread id my $tid = APR::OS::current_thread_id(); Description "APR::OS" provides the Perl interface to platform-specific APR API. You should be extremely careful when relying on any of the API provided by this module, since they are no portable. So if you use those you application will be non-portable as well. API
"APR::OS" provides the following methods: "current_thread_id" Get the current thread ID $tid = APR::OS::current_thread_id(); ret: $tid ( integer ) under threaded MPMs returns the current thread ID, otherwise 0. since: 2.0.00 Example: use Apache2::MPM (); use APR::OS (); if (Apache2::MPM->is_threaded) { my $tid_obj = APR::OS::current_thread_id(); print "TID: $tid"; } else { print "PID: $$"; } See Also mod_perl 2.0 documentation. Copyright mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0. Authors The mod_perl development team and numerous contributors. perl v5.14.2 2011-02-08 libapache2-mod-perl2-2.0.7::docs::api::APR::OS(3pm)
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