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Top Forums Shell Programming and Scripting Calculating delay time - bash Post 302307016 by jbsimon000 on Tuesday 14th of April 2009 11:23:41 AM
Old 04-14-2009
Calculating delay time - bash

Hi,

I am having the following problem.

test > hourOfDay=06 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime
180
test > hourOfDay=07 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime
120
test > hourOfDay=08 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime
bash: (9-08: value too great for base (error token is "08")
test > hourOfDay=09 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime
bash: (9-09: value too great for base (error token is "09")
test > hourOfDay=10 ; delayTime=$(((9-$hourOfDay)*60)) ; echo $delayTime
-60

you can see where hourOfDay = 08 or 09 I get the error
bash: (9-08: value too great for base (error token is "08")

does it think that these are base 8 numbers ?
because of the leading "0" ?

In my script I get the hourOfDay using
hourOfDay=$(date +%H)

Is there an easy way to strip off the '0', if that is the problem ?
(sorry if this is an easy thing, I mess with scripts less than once a month,
so not very experienced).

Thanks !
joe
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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