Compare two dates using Shell Programming

•

What is DaniWeb IT Discussion Community?

You're currently browsing the Shell Scripting section within the Software Development category of DaniWeb, a massive community of 456,572 software developers, web developers, Internet marketers, and tech gurus who are all enthusiastic about making contacts, networking, and learning from each other. In fact, there are 3,589 IT professionals currently interacting right now! Registration is free, only takes a minute and lets you enjoy all of the interactive features of the site.

Join our community!

Please support our Shell Scripting advertiser: Programming Forums

Thread Tools Display Modes

Views: 2174 | Replies: 4 | Solved

•

Join Date: Oct 2007

Posts: 22

Reputation: dave_nithis is an unknown quantity at this point

Rep Power: 2

Solved Threads: 0

dave_nithis dave_nithis is offline

Offline

Newbie Poster

Compare two dates using Shell Programming

Oct 26th, 2007

Hi all,

a=2007-05-10
b=2007-06-10

These are the two given dates and I need to compare.

The script should first compare years.If both are same or if a is lesser than b,it should print correct.If a is greater than b,then it should print error.Similarly for the dates(05 and 06).

No need to check for the months(10)

Regards
Dave Nithis

•

Join Date: Feb 2006

Posts: 1,518

Reputation: masijade is a glorious beacon of light

Rep Power: 10

Solved Threads: 136

masijade

Online

Posting Virtuoso

Re: Compare two dates using Shell Programming

Oct 26th, 2007

are you using ksh or bash? if so

Help with Code Tags

(Toggle Plain Text)

set -A aArray `print "$a" | sed -e 's/-/ /'`
set -A bArray `print "$b" | sed -e 's/-/ /'`
# now ${aArray[0]} and ${bArray[0]} contain the year
# and ${aArray[1]} and ${bArray[1]} contain the day
# and ${aArray[2]} and ${bArray[2]} contain the month

The comparison parts you can do yourself.

Last edited by masijade : Oct 26th, 2007 at 9:57 am. Reason: Oops, wrong var names in the comments

Java Programmer and Sun Systems Administrator

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

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan

•

Join Date: Oct 2007

Posts: 22

Reputation: dave_nithis is an unknown quantity at this point

Rep Power: 2

Solved Threads: 0

dave_nithis dave_nithis is offline

Offline

Newbie Poster

Re: Compare two dates using Shell Programming

Oct 26th, 2007

I am new to this shell scripting..
Can you give me the comparision part also

Regards
Dave Nithis

•

Join Date: Feb 2006

Posts: 1,518

Reputation: masijade is a glorious beacon of light

Rep Power: 10

Solved Threads: 136

masijade

Online

Posting Virtuoso

Re: Compare two dates using Shell Programming

Oct 26th, 2007

At the top of this forum is a fixed post to a tutorial. Read through some of that, try something out, if it doesn't work post your code and I'll help, but I'll not do it for you.

Last edited by masijade : Oct 26th, 2007 at 12:48 pm. Reason: typo

•

Join Date: Apr 2006

Posts: 140

Reputation: ghostdog74 is an unknown quantity at this point

Rep Power: 3

Solved Threads: 26

ghostdog74 ghostdog74 is offline

Offline

Junior Poster

Re: Compare two dates using Shell Programming

Oct 28th, 2007

Help with Code Tags

(Toggle Plain Text)

a="2007-05-10"
b="2007-06-10"
awk -v a="$a" -v b="$b" 'BEGIN{
n=split(a,tmpa,"-")
m=split(b,tmpb,"-")
if ( ( tmpa[1] <= tmpb[1] )  && ( tmpa[2] <= tmpb[2] ) ){
 print "correct"
}
else { print "not correct"}
}
'