Downloading file with different unique name

Question

How to download file with different unique name each time

wget -O image.jpg "http://localhost/cgi-bin/nph-zms?mode=single&monitor=1"

Using wget's -O option overwrites file each time. What I want is: image-1.jpg, image-2.jpg, image-3.jpg etc. each time wget is run from cron.

Answer 1

wget -O image-`date +%H`.jpg "http://localhost/cgi-bin/nph-zms?mode=single&monitor=1"

If you are doing an hourly check. From looking at the URL you appear to be grabbing it from a webcam.

Your images should be labeled as:

• image-01
• image-02
• [...]
• image-14
• image-15
• [...]

Answer 2

ser=$(</var/local/image.ser); echo $((++ser)) > /var/local/image.ser; wget -O image-${ser}.jpg "http://localhost/cgi-bin/nph-zms?mode=single&monitor=1"