Shell Programming and Scripting

Hi,

I have 200 pictures in a folder and I would like move 10 random pictures every week to given folder automatically.

I have this server on 1and1.com.

So I tried the following using Bash script for manual copy and paste for testing

Code:

 
#!/bin/bash
mapfile -t -n 3 files < <(find /homepages/mylocation/location/htdocs/release/randompics/ -type f | sort -R)
cp --backup=numbered "${files[@]}" /homepages/mylocation/mylocation/htdocs/release/pictures/

when execute this script on my linux machine I get:


NOTE: 'mylocation' is just my reference. I have changed it for privacy issue.

I am not sure what is wrong here? Can you somebody help me out?

Awaiting your response!

Thanks!

Apparently your sort doesn't have -R.

I think -R is a GNU/Linux thing.

Try shuf.

do you have any syntax for it?

BTW: In my previous post is my code correct?

I have no idea what mapfile is, so can't even guess.

You use shuf like you'd use sort -R. Also, see man shuf.

How I'd do it:

Code:

find /homepages/mylocation/location/htdocs/release/randompics/ -type f | shuf |
        for ((N=0; N<10; N++))
        do
                read LINE || break;
                mv "$LINE" "/path/to/dest"
        done

I got the mapfile through manuals..

I used the code syntax given by you I got the following:


What could be the issue? Guess Shuf is not supported.

I was searching the internet for this somebody has tried this:

Code:

 
ls | while read x; do echo "`expr $RANDOM % 1000`:$x"; done \ | sort -n| sed 's/[0-9]*://' | head -15

The above listed out random 15 files.

But do you know how to use the above code to copy and paste the file to a location?

'command not found' generally means 'command not found'.

That's a clever way to do it -- append a number to the filename, so sort puts them into a random order. It will be slow though, since the shell has to process each and every filename found, bar none, before a result can happen.

It works nearly the exact same way I showed you -- read filenames one by one, then move them, except you have to strip the number off.

Hey!

Thanks for the reply!

I figured out the way to get the random file working... with the code that could list out the files. And everything works just fine when I manually run the script with.

prompt> chmod +x move.sh
prompt> ./move.sh

I files are randomily selected, renamed and moved to the location.

But I have another issue:

When I do the same using cronjob for the shell script.

prompt> crontab -e

and type the below:

49 11 * * 3 /bin/chmod +x /kunden/homepages/mylocation/mylocation/htdocs/release/sites/default/files/randompics/move.sh
50 11 * * 3 /bin/bash /kunden/homepages/mylocation/mylocation/htdocs/release/sites/default/files/randompics/move.sh

I couldn't get the file moved but the existing file got deleted as per the code and also sent me an email too...but it didn't do the main job moving random file to given location.

Do you know what could be wrong?

Thanks!