?4 being added to file name with this Bash script, why? – unix.stackexchange.com

?4 being added to file name with this Bash script, why? – unix.stackexchange.com

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I have this script that extracts one frame from a lot of mp4 videos and store them as png for i in *.mp4; do [ -f "$i" ] || break number=$(echo "$i" | grep -o -E '[0-9]+') name=frame"$...

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