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Full Discussion: Date Subtraction
Top Forums UNIX for Dummies Questions & Answers Date Subtraction Post 302878953 by priyaa2010 on Monday 9th of December 2013 09:11:39 PM
Old 12-09-2013
Date Subtraction

Hello All,
I am a newbie to unix shell scripting and need to write a script that displays the difference between two variables that stores date value.

For example,
Code:
F1=`ls -ltr file1* | tail -1 |tr -s ' ' |cut -d' ' -f6,7,8`
F2=`ls -ltr file2* | tail -1 |tr -s ' ' |cut -d' ' -f6,7,8`

F1 and F2 stores the values like Aug 02 06:54(month,date and time). I need to find the difference between these two variables. I tried using expr and just regular subtraction which doesnt work. Can you please help me understand how to do date arithmetic in unix?

I tried searching and found some stuff like date -d option which doesnt work in my case.

Please share your valuable suggestions.

Thanks,
Priya.

Last edited by Franklin52; 12-10-2013 at 03:17 AM.. Reason: Please use code tags
 

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DM_ZDUMP(1)						User Contributed Perl Documentation					       DM_ZDUMP(1)

NAME
dm_zdump - timezone dumper SYNOPSIS
This performs the same operation as the unix 'zdump' command, but using the Date::Manip module. dm_zdump [-v] [-c YEAR] [ZONE ZONE ...] DESCRIPTION
This displays the current time in each ZONE named on the command line unless the -v option is given. -h, --help Print online help. -v, --verbose This displays all critical dates (i.e. the times when a time change occurs due to the timezone description) for each of the timezones listed (or the local timezone if none are listed). Each critical date is printed as two lines of output: the last second before the change occurs, and the first second of the new time. By default, all critical dates from Jan 1, 0001 until the year 20 years in the future are printed, but this can be changed with the -c option. -c, --cutoff YEAR This specifies the cutoff year. All critical dates up to the start of YEAR are given. The GMT time Jan 01, YEAR at 00:00:00 is the cutoff time. KNOWN BUGS
None known. BUGS AND QUESTIONS
Please refer to the Date::Manip::Problems documentation for information on submitting bug reports or questions to the author. SEE ALSO
Date::Manip::Date LICENSE
This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR
Sullivan Beck (sbeck@cpan.org) perl v5.16.3 2014-06-09 DM_ZDUMP(1)
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