Shell Programming and Scripting

I'm trying to do some simple math on a 24 hour time base.

The time is in the format of HM (HoursMinutes)

For example:
2330 #23:30
1800 #18:00
730 #07:30

my problem is with the single-digit hours. If the time is 2200, I use this code:

Code:

baseTime=2200
minutes=${baseTime:2:3}
hours=${baseTime:0:2}

This works great, but it fails if the hours is single-digit:

Code:

baseTime=655
minutes=${baseTime:2:3}
hours=${baseTime:0:2}

#Fails!!!

Is there a way to handle this gracefully? I just want to separate the hour and minute components of a 3 or 4 digit time.


thanks

Maybe this can help:

Code:

% var=655

% [[ ${#var} == 3 ]] && var=0$var

% echo $var
0655

check this too ..

code:

Code:

awk ' { if ( $1 < 1000 ) { print "0"$1 } else { print $1 } } ' <input_file>

Code:

time=630
h=`expr $time / 100` 
m=`expr $time % 100` 
echo $h $m