how to cut the video using ffmpeg in linux

 ffmpeg -i 12 -t 4086 -c copy part5.mk

ffmpeg -ss 01:08:15 -i 12 -c copy part3.mkv

ffmpeg -i 6.mkv -t 285 -c copy part1.mkv # Extract the segment from the beginning until 4 minutes 45 seconds
ffmpeg -ss 290 -i 6.mkv -c copy part2.mkv # Extract the segment from 4 minutes 50 seconds to the end
ffmpeg -f concat -i <(echo -e "file 'part1.mkv'\nfile 'part2.mkv'") -c copy output.mkv # Concatenate the two segments