Increment date in 'for' loop?

SunnyK · #1 (**permalink**) 10-29-2007

Hi Guys,

My first post..

Right...I want to move existing files (with some date in their name) currently in $mainftp, to $mainfolder/$foldate/system1.

I'd like to be able to increment date in the for loop? Is this possible or should I use a different technique.

The script return the following error

./movediselogs.sh: line 8: ((: foldate=070820: value too great for base (error token is "070820")

Hope that makes sense...

-----------------------

#!/bin/sh

startdate=`/bin/date --date="10 weeks ago" +%y%m%d`
currentdate=`/bin/date +%y%m%d`
mainfolder=/data/backup
mainftp=/ftp/upload/ftpsystem1

for ((foldate=$startdate; $foldate < $currentdate; foldate++))
do
mkdir $mainfolder/$foldate/system1
mv $mainftp/*$foldate* $mainfolder/$foldate/system1
done

-----------------------

Many Thanks
SunnyK

aigles · #2 (**permalink**) 10-29-2007

Numbers statrting with 0 are evaluated as octal numbers : 070820 is an invalid octal number.

A solution is to force decimal base evaluation :

Code:

#!/bin/sh

startdate=10#`/bin/date --date="10 weeks ago" +%y%m%d`
currentdate=10#`/bin/date +%y%m%d`
mainfolder=/data/backup
mainftp=/ftp/upload/ftpsystem1

for ((foldate=$startdate; $foldate < $currentdate; foldate++))
do
   mkdir $mainfolder/$foldate/system1
   mv $mainftp/*$foldate* $mainfolder/$foldate/system1
done

This script will not give you any error, but i am not sure that the result is what you are expected.
Incrementng the date will give you invalid dates, for example :
070831+1=070832 <= Invalid date
Jean-Pierre.

SunnyK · #3 (**permalink**) 10-29-2007

Quote:

Originally Posted by aigles

Numbers statrting with 0 are evaluated as octal numbers : 070820 is an invalid octal number.

A solution is to force decimal base evaluation :

Code:

#!/bin/sh

startdate=10#`/bin/date --date="10 weeks ago" +%y%m%d`
currentdate=10#`/bin/date +%y%m%d`
mainfolder=/data/backup
mainftp=/ftp/upload/ftpsystem1

for ((foldate=$startdate; $foldate < $currentdate; foldate++))
do
   mkdir $mainfolder/$foldate/system1
   mv $mainftp/*$foldate* $mainfolder/$foldate/system1
done

This script will not give you any error, but i am not sure that the result is what you are expected.
Incrementng the date will give you invalid dates, for example :
070831+1=070832 <= Invalid date
Jean-Pierre.

Hey Jean,

Thanks for replying...

The solution you suggested should help me accomplish my task until date reaches the value 070831.

However, after that, I'd like the script to increment the month (as in performing increment on a date variable) and perform the remaining part of the task until currentdate.

I think this shouldnt be much of a problem in other programming languages (I am new to shell scripting though). Also, if you feel there is a better alternate approach, please feel free to suggest.

Thanks
SunnyK

aigles · #4 (**permalink**) 10-29-2007

Lets the date command increment the date for you :

Code:

#!/bin/sh

startdate=`/bin/date --date="10 weeks ago" +%y%m%d`
currentdate=`/bin/date +%y%m%d`
mainfolder=/data/backup
mainftp=/ftp/upload/ftpsystem1

foldate="$startdate"
until [ "$foldate" == "$currentdate" ]
do
   mkdir $mainfolder/$foldate/system1
   mv $mainftp/*$foldate* $mainfolder/$foldate/system1
   foldate=`/bin/date --date="$foldate 1 day" +%y%m%d`
done

Jean-Pierre.

SunnyK · #5 (**permalink**) 10-30-2007

Quote:

Originally Posted by aigles

Lets the date command increment the date for you :

Code:

#!/bin/sh

startdate=`/bin/date --date="10 weeks ago" +%y%m%d`
currentdate=`/bin/date +%y%m%d`
mainfolder=/data/backup
mainftp=/ftp/upload/ftpsystem1

foldate="$startdate"
until [ "$foldate" == "$currentdate" ]
do
   mkdir $mainfolder/$foldate/system1
   mv $mainftp/*$foldate* $mainfolder/$foldate/system1
   foldate=`/bin/date --date="$foldate 1 day" +%y%m%d`
done

Jean-Pierre.

Thanks Jean...it works! :-)

You're a star!

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
Shell Script To increment DateHElp**	niceboykunal123	Shell Programming and Scripting	1	04-23-2008 01:05 AM
how can i read a line using the 'for'	vadharah	Shell Programming and Scripting	10	03-02-2008 02:26 PM
the given code goes in infinite loop and does not increment variable i	mrityunjay22	Shell Programming and Scripting	6	12-26-2007 02:20 AM
Using 'for' with 2 variables?	micro420	Shell Programming and Scripting	4	05-19-2007 05:02 AM
Date increment in the format "YYYYMMDD"	ganapati	Shell Programming and Scripting	4	08-02-2006 11:45 AM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by