1) Cutting video between two time stamps
ffmpeg -ss 00:01:25 -to 00:01:32 -i file_name.mp4 -c copy new_file_name.mp4
2) Removing audio from a video
ffmpeg -i file_name.mp4 -vcodec copy -an new_file_name.mp4
3) Extracting data of a specific row or column number (N) from a series of files
awk 'FNR==N {print; nextfile}' file_name* > data_file_name.dat
4) Add some_text to the beginning of a file
sed -i -e 's/^/some_text /' input_file
5) Add some_text to the end of a file
sed -i 's/^/some_text /' input_file
6) For replacing a text in a file
sed -i 's/oldtext/newtext/g' myFile.txt
7) For getting the latest entry of a folder
ls -Art | tail -n 1
8) For extracting a particular column (n) of a file
awk '{print $n}' inpfile > outfile
9) For extracting specific lines (1 to 10) of a file:
sed -n "1, 10"p inpfile > outfile
10) For retrieving lines of a file containing a specific 'string'
grep 'string' inpfile > outfile