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Full Discussion: How to convert hex numbers to decimal ?
Top Forums Shell Programming and Scripting How to convert hex numbers to decimal ? Post 302297421 by jack2 on Friday 13th of March 2009 10:28:51 AM
Old 03-13-2009
Quote:
Originally Posted by daptal
To convert hex to decimal try using bc
Eg:- bc
ibase=16
3039
12345

and the second part of conversion of seconds to min 1 min = 60 sec so if $x sec is given $x/60 will give u min and so on

similarly for bytes use 1000 or 1024 as a standard
Thanks for your excellent solution.
Unfortunately neither my Linux embedded machine not Nokia Tablet come
with bc installable package.
So I have to look for another shell based only solution.

Great idea is to use in bc - input and out base (there is a number of good bc calculator examples I learned from Google).

For seconds conversion it would be nice to use timestamp, datetime
to read seconds as input and output result in one of available formats,
the same with bytes to Mbytes, Gbytes conversion,
as I need to write another conversion script for use in main script.

minutes = seconds (mod 60)

expr 5 % 3
2
works fine for constants

didn't work for seconds as variable
/="slash-equal" (divide variable by a constant)
%="mod-equal" (remainder of dividing variable by a constant)
It started to work for me as in the following example
# If you need a random int within a certain range, use the 'modulo' operator.
# This returns the remainder of a division operation.

RANGE=500

echo

number=$RANDOM
let "number %= $RANGE"
# ^^
echo "Random number less than $RANGE --- $number"
-
for remainder
seconds %= seconds
for minutes
minutes /= seconds
..

a=9
let "a %= 4"
echo $a
1

so a mod(4) = 1, exactly as 9 = 2*4 + 1 -

for conversion of seconds I would like to use epoch time
and date +%s
I get 95958

should be

The current Unix epoch time is 1236954365


-
-
What is epoch time?

The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds. The epoch timestamp 0 can be written in ISO 8601 format as: 1970-01-01T00:00:00Z. One epoch hour is 3600 seconds, one epoch day is 86400 seconds long, leap seconds are not calculated. Many Unix systems store epoch dates as a signed 32-bit integer, which might cause problems on January 19, 2038 (known as the Year 2038 problem or Y2038).

Human readable time Seconds 1 minute60 seconds 1 hour3600 seconds 1 day86400 seconds 1 week604800 seconds 1 month (30.44 days) 2629743 seconds 1 year (365.24 days) 31556926 seconds

Jack
 

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LEARN ABOUT DEBIAN

timetrans

TIMETRANS(1p)						User Contributed Perl Documentation					     TIMETRANS(1p)

NAME

       timetrans - Converts time into time

SYNOPSIS

	 timetrans [units-options] [-count]

DESCRIPTION

       timetrans converts time from one type of unit to another.  If any of the units options are specified, then timetrans will convert those
       time units into the number of seconds to which they add up.  If given the count option, timetrans will convert that number of seconds into
       the appropriate number of weeks, days, hours, minutes, and seconds.  The converted result is printed out.  Units options cannot be
       specified in the same execution as the count option, and vice versa.

       timetrans is intended for use with DNSSEC-Tools, for calculating a zone's expiration time.

OPTIONS

   Units Options
       The converted value of each unit is totaled and a single result printed.

       -seconds seconds
	   Count of seconds to convert to seconds.

       -minutes minutes
	   Count of minutes to convert to seconds.

       -hours hours
	   Count of hours to convert to seconds.

       -days days
	   Count of days to convert to seconds.

       -weeks weeks
	   Count of weeks to convert to seconds.

   Count Option
       The specified seconds count is converted to the appropriate number of weeks, days, hours, minutes, and seconds.

       -count seconds
	   Count of seconds to convert to the appropriate set of units.

   Other Options
       timetrans has the following miscellaneous options.

       -Version
	   Displays the version information for timetrans and the DNSSEC-Tools package.

EXAMPLES

       Example 1:  Converting 5 days into seconds

	   $(42)> timetrans -days 5
	   432000

       Example 2:  Converting 2 weeks into seconds

	   $(43)> timetrans -w 2
	   1209600

       Example 3:  Converting 8 days and 8 hours into seconds

	   $(44)> timetrans -d 8 -hours 8
	   720000

       Example 4:  Converting 1 week, 1 day, and 8 hours into seconds

	   $(46)> timetrans -w 1 -days 1 -h 8
	   720000

       Example 5:  Converting 14 weeks, 4 days, 21 hours, 8 minutes, and 8 seconds into seconds

	   $(47)> timetrans -w 14 -d 4 -h 21 -m 8 -s 8
	   8888888

       Example 6:  Converting 720000 seconds into time units

	   $(48)> timetrans -c 720000
	   1 week, 1 day, 8 hours

       Example 7:  Converting 1814421 seconds into time units

	   $(49)> timetrans -c 1814421
	   3 weeks, 21 seconds

       Example 8:  Converting 8888888 seconds into time units

	   $(50)> timetrans -c 8888888
	   14 weeks, 4 days, 21 hours, 8 minutes, 8 seconds

COPYRIGHT

       Copyright 2004-2012 SPARTA, Inc.  All rights reserved.  See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

       Wayne Morrison, tewok@tislabs.com

SEE ALSO

       zonesigner(8)

       Net::DNS::SEC::Tools::timetrans.pm(3)

perl v5.14.2							    2012-06-21							     TIMETRANS(1p)
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