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Top Forums Shell Programming and Scripting Day/Hour diff between two date Post 302951222 by sea on Tuesday 4th of August 2015 05:18:33 AM
Old 08-04-2015
I'm no expert with awk, but here's something i'd like to share:

While i do agree that one-liners are cool, there are occasions it just makes no sense.
Saying, a well formated code is easier to read - and find issues/improvements, than within a one liner of that length. (me have FHD (1920x1080) display, and i need to scroll sideways)

This said, you might want to use a function (rather than an if-block) to transform time and date to seconds and to avoid things like:
Code:
... +((0*3600+0*60+0)+ ..

For which you could have just written +0.

Once you transformed the date+time to seconds, you simply subtract the one from the other and get the difference.

Hope my 2 cents help
 

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calendar(1)						      General Commands Manual						       calendar(1)

Name
       calendar - calendar reminder service

Syntax
       calendar [-]

Description
       The  command  consults the file `calendar' in the current directory and prints out lines that contain today's or tomorrow's date.  The com-
       mand recognizes most month-day dates, such as Dec. 7, december 7, 12/7, but it does not recognize dates formatted in the following ways:  7
       December  or  7/12.  If you give the month as * with a date, such as, * 1, that day in any month will do.  On weekends, specifying tomorrow
       extends through Monday.

       When an argument is present, the command searches through a user's calendar file in his login directory and sends him any positive  results
       by Normally this is done daily under control of

       The  calendar  file  is	first  run  through  the  C  preprocessor, to include any other calendar files specified with the #include syntax.
       Included calendars are shared by all users, and are maintained and documented by the local administration.

Options
       -    Functions for every user who has a calendar file in his login directory.

Restrictions
       The extended idea of tomorrow does not account for holidays.

Files
       calendar
       /usr/lib/calendar to figure out today's and tomorrow's dates
       /etc/passwd
       /tmp/cal*
       /lib/cpp, egrep, sed, mail as subprocesses

See Also
       at(1), cron(8), mail(1)

																       calendar(1)
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