Re: script to loop through dates

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On Friday, June 27th, 2025 at 8:33 AM, Barry <barry@xxxxxxxxxxxxxxxx> wrote:

> > On 27 Jun 2025, at 12:32, olivares33561 via users users@xxxxxxxxxxxxxxxxxxxxxxx wrote:
> > 
> > Dear Fedora users,
> > 
> > I am struggling to create a script that generates a series of dates with special "+%Y.%m.%d" like the following
> 
> 
> Do you know python? It would be a lot easier to solve using a small amount of python scripting.

Sadly I do not know python :( I did a little bit bit of C and C++ back in the day like 30 years ago but that is about it.

We can use awk for this too!  We can seq like George pointed out.  We use whichever tool as long as the output looks as I wanted it to look.

There are two or three options and they all work.  Thanks to all who have responded.  

Best Regards,


Antonio 
> 
> Barry
> 
> > 2025.06.01
> > 2025.06.01
> > 2025.06.01
> > 2025.06.01
> > 2025.06.02
> > ..
> > ..
> > ..
> > 2025.06.03
> > ..
> > ..
> > ..
> > .
> > Through
> > 2025.06.30
> > 
> > Print four dates of June 1, then June 2, all the way through to June 30
> > 
> > I found several examples but can't succeed to get what I want
> > ------
> > 
> > #!/bin/bash
> > start=$1
> > end=$2
> > 
> > start=$(date -d $start +%Y%m%d)
> > end=$(date -d $end +%Y%m%d)
> > 
> > while [[ $start -le $end ]]
> > do
> > echo $start
> > start=$(date -d"$start + 1 day" +"%Y%m%d")
> > done
> > ------
> > 
> > bash daterange.sh 2025-07-01 2025-07-16
> > 20250701
> > 20250702
> > 20250703
> > 20250704
> > 20250705
> > 20250706
> > 20250707
> > 20250708
> > 20250709
> > 20250710
> > 20250711
> > 20250712
> > 20250713
> > 20250714
> > 20250715
> > 20250716
> > 
> > I found the script here:
> > 
> > https://techieroop.com/loop-through-a-date-range-in-shell-script/
> > 
> > Fix it to print for example above
> > 
> > 2025.07.01
> > 2025.07.01
> > 2025.07.01
> > 2025.07.01
> > 2025.07.02
> > ..
> > ..
> > ..
> > .
> > .
> > .
> > 2025.07.16
> > 
> > I have changed date format to %Y.%m.%d but I get errors
> > 
> > .../Download/mptmp $ bash daterange.sh 2025-07-01 2025-07-16
> > daterange.sh: line 8: [[: 2025.07.01: syntax error: invalid arithmetic operator (error token is ".07.01")
> > .../Download/mptmp $ bash daterange.sh 2025.07.01 2025.07.16
> > date: invalid date ‘2025.07.01’
> > date: invalid date ‘2025.07.16’
> > 
> > daterange.sh: line 8: [[: 2025.06.27: syntax error: invalid arithmetic operator (error token is ".06.27")
> > 
> > How can it be fixed to do what I want?
> > 
> > Best Regards,
> > 
> > Antonio
> > 
> > Sent from ProtonMail, encrypted email based in Switzerland.
> > 
> > Sent with Proton Mail secure email.
> > <publickey - olivares33561@xxxxxxxxxxxxxx - 0x865D4DD3.asc>
> > --

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