Question Cron job to rename image files - syntax question

[onki]

Server operating system version

ubuntu 20.04

Plesk version and microupdate number

18.0.59

I am using a IP camer that uploads an image in a time sequence (currently once ever 15 minutes).
The current camera uploads the images with time coded file name (e.g. Schedule_20240430-213000.jpg).
the new camera always uses the same filename (schedule.jpg) and I cannot change that.
Since I want to display the last 4 images on my website I need to change the file name to a timecoded in a cron job.
Is this possible by using a cron command or do I need a shell script?
Any help is welcome since I am struggeling with the syntax.

I created a shell script and tried to run it through the cron command:

sh /usr/local/sbin/rename_cam.sh

But this does not work. script is executable (755)

This is the script:

#!/bin/bash

if [[ -f "var/www/vhosts/mydomain.de/httpdocs/images/webcam/ip_cam_le202/Snapshot/snapshot.jpg" ]]; then
mv /var/www/vhosts/mydomain.de/httpdocs/images/webcam/ip_cam_le202/Snapshot/snapshot.jpg /var/www/vhosts/mydomain.de/httpdocs/images/webcam/ip_cam_le202/Snapshot/$(date +%y%m%d%H%M%S).jpg
fi

When I try to run the script I get this error:

/usr/local/sbin/rename_cam.sh: 3: [[: not found

What could be the problem?

Best regards
Onki

 

[Kaspar@Plesk]

There is a similar question on Stackoverflow with a great answer: Bash syntax error: "[[: not found"

TL;DR: try to run your script as Bash instead of SH.

 

[onki]

Now the message is gone when I use bash command. But my file is still not renamed.
Is there anything wrong with my script?

 

[Kaspar@Plesk]

Maybe there is an / missing at the beging of your string comparison?

 

[onki]

Thanks, that was one of the problems that I found. All were path related.
Thanks for solving the issue.

br
Onki