Adding a List of Times Post: 302981243

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Top Forums Shell Programming and Scripting Adding a List of Times Post 302981243 by Brusimm on Thursday 8th of September 2016 08:01:58 PM

09-08-2016

Registered User

Adding a List of Times

Hey gang, I have a list of times I need to sum up. This list can vary from a few to a few thousand entries. Now I had found a closed reference to adding time titled "add up time with xx:yy format in bash how?" In it, the example works great for that formatted list of times... This is the reply code from user AGAMA in that thread:

Code:

list="1:11 0:13 2:06 1:38 1:36 0:06 0:31 0:33 0:38 0:44"

h=0
m=0
for x in ${list}
do
    h=$(( h + ${x%%:*} ))   # add hours and minutes
    m=$(( m + ${x##*:} ))
done

h=$(( h + (m /60) ))    # minutes are likely more than 60, calc hours and add in 
m=$(( m % 60 ))     # adjust minutes

echo "${h}hrs ${m}min

"

BUT what I'm getting hung up on is how would I introduce the third parameter of seconds to this, if my times had the three columns?

I'm not quite verse enough in scripting to understand the formatting of the read in the 'do' loop. Are the '%' and '#' arbitrary or necessary for what they're representing?

In the other thread Agama tries to explain parameter expansion in a latter reply, but try as I may, I'm not wrapping my shrunken brain around this. I do need a bit of assistance trying to figure it out and adding in the seconds to tally up.

Thank you.

Brusimm

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LEARN ABOUT PLAN9

astro

ASTRO(7)						 Miscellaneous Information Manual						  ASTRO(7)

NAME

       astro - print astronomical information

SYNOPSIS

       astro [ -dlepsatokm ] [ -cn ]

DESCRIPTION

       Astro reports upcoming celestial events, by default for 24 hours starting now.  The options are:

       d      Read the starting date.  A prompt gives the input format.

       l      Read the north latitude, west longitude, and elevation of the observation point.	A prompt gives the input format.  If l is missing,
	      the initial position is read from the file /lib/sky/here.

       c      Report for n (default 1) successive days.

       e      Report fractional overlap during eclipses.

       p      Print the positions of objects at the given time rather than searching for interesting conjunctions.  For each, the name is followed
	      by  the  right ascension (hours, minutes, seconds), declination (degrees, minutes, seconds), azimuth (degrees), elevation (degrees),
	      and semidiameter (arc minutes).  For the sun and moon, the magnitude is also printed.

       s      Print output in English words suitable for speech synthesizers.

       a      Include a list of artificial earth satellites for interesting events.  (There are no orbital elements for the  satellites,  so  this
	      option is not usable.)

       t      Read  /T  from  standard  input.   /T  is  the difference between ephemeris and universal time (seconds) due to the slowing of the
	      earth's rotation.  /T is normally calculated from an empirical formula.	This option is needed only for	very  accurate	timing	of
	      occultations, eclipses, etc.

       o      Search for stellar occultations.

       k      Print times in local time (`kitchen clock') as described in the timezone environment variable.

       m      Includes	a  single  comet  in the list of objects.  This is modified (in the source) to refer to an approaching comet but in steady
	      state usually refers to the last interesting comet (currently Levy, 1990c).

FILES

       /lib/sky/estartab
	      ecliptic star data

       /lib/sky/here
	      default latitude (N), longitude (W), and elevation (meters)

SOURCE

       /sys/src/cmd/astro

SEE ALSO

       scat(7)

BUGS

       The k option reverts to GMT outside of 1970-2036.

																	  ASTRO(7)

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