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Top Forums Shell Programming and Scripting Convert hexadecimal value in decimal value Post 302737463 by enaud on Thursday 29th of November 2012 04:20:19 AM
Old 11-29-2012
Convert hexadecimal value in decimal value

hi all,
this is my script:
Code:
#! /bin/sh

minutes=$( { i2cget -f -y 0 0x51 3; } 2>&1 )
minutes=${minutes:2}
 
hour=$( { i2cget -f -y 0 0x51 4; } 2>&1 )
hour=${hour:2}
 
day=$( { i2cget -f -y 0 0x51 5; } 2>&1 )
day=${day:2}
 
month=$( { i2cget -f -y 0 0x51 7; } 2>&1 )
month=${month:2}
 
year=$( { i2cget -f -y 0 0x51 8; } 2>&1 )
year=${year:2}
 
date -s 20$year$month$day-$hour:$minutes

i want get data and time from a RealTimeClock plugged on i2c of my embedded board and after setdate with this value.

but with i2cget command i receive an hexdecimal value like 0x54 and with year=${year:2} i have year =54 but i need convert this number to decimal, but how?

I cant use bc because in my embedded board there isnt.
thanks
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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