cut 10 sec from start and from end of video with ffmpeg

I'm trying to cut 10 sec from the begging and from end of videos. I have 150 short videos in mp4 and I want to do this in batch. I have downloaded ffmpeg (x64) and installed. When I type the command "ffmpeg –version" in cmd then I get the listing and installation was successful, correct? Then I found this on your site: for f in *.mp4; do duration=$(ffmpeg -i "$f" 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//) length=$(echo "$duration" | awk '{ split($1, A, ":"); print 3600*A[1] + 60*A[2] + A[3] }' ) trim_start=10 trim_end=$(echo "$length" - 10 - "$trim_start" | bc) echo ffmpeg -ss "$trim_start" -i "$f" -c copy -map 0 -t "$trim_end" "${f%.mp4}-trimmed.mp4" done"

I was created bat file with that code and placed in folder with videos, and when I start .bat it's just blink and disappears. Folder with videos is on c:, on the same drive where is path for ffmpeg (just to add if is important).

Can someone help me with this?

Thanks