Code creates day 32 instead of 1st day of next month. Post: 302441220

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Top Forums Shell Programming and Scripting Code creates day 32 instead of 1st day of next month. Post 302441220 by libertyforall on Thursday 29th of July 2010 09:24:42 PM

07-29-2010

Registered User

Code creates day 32 instead of 1st day of next month.

I am using the code below modified from a post I saw here regarding having the script write out future dates. The problem is that instead of making 8/1 it makes 7/32! Please help!

Code:


yy=`date +%Y`
mm=`date +%m`
dd=`date +%d`

echo "Today is : $yy $mm $dd"


#!/usr/bin/ksh

date '+%m %d %Y' | 
{ 
read m d Y
d=`expr "$d" + 1` 
case "$d" in 
        0) 
           m=`expr "$m" + 1` 
                case "$m" in 
                        0) 
                           m=12 
                           Y=`expr "$Y" + 1` 
                        ;; 
                esac 
        d=`cal $m $Y | grep . | fmt +1 | tail +1` 
esac 

echo "Tomorrow is : $m $d $Y" 



d=`expr "$d" + 1` 
case "$d" in 
        0) 
           M=`expr "$m" + 1` 
                case "$m" in 
                        0) 
                           m=12 
                           Y=`expr "$Y" + 1` 
                        ;; 
                esac 
        d=`cal $m $Y | grep . | fmt +1 | tail +1` 
esac 

echo "The day after tomorrow is : $Y$m$d"



d=`expr "$d" + 1` 
case "$d" in 
        0) 
           M=`expr "$m" + 1` 
                case "$m" in 
                        0) 
                           m=12 
                           Y=`expr "$Y" + 1` 
                        ;; 
                esac 
        d=`cal $m $Y | grep . | fmt +1 | tail +1` 
esac 

echo "Two days from today is : $Y$m$d"


}
exit

Last edited by libertyforall; 07-31-2010 at 01:24 AM..

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LEARN ABOUT OPENSOLARIS

let

let(1)								   User Commands							    let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

   ksh93
       let [expr...]

DESCRIPTION

   ksh
       Each arg is a separate arithmetic expression to be evaluated.

   ksh93
       let  evaluates  each expr in the current shell environment as an arithmetic expression using ANSI C syntax. Variables names are shell vari-
       ables and they are recursively evaluated as arithmetic expressions to get numerical values. let has been made obsolete by the ((...))  syn-
       tax of ksh93(1) which does not require quoting of the operators to pass them as command arguments.

EXIT STATUS

   ksh
       ksh returns the following exit values:

       0    The value of the last expression is non-zero.

       1    The value of the last expression is zero.

   ksh93
       ksh93 returns the following exit values:

       0     The last expr evaluates to a non-zero value.

       >0    The last expr evaluates to 0 or an error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), ksh93(1), set(1), typeset(1), attributes(5)

SunOS 5.11							    2 Nov 2007								    let(1)

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