Useful command-line stuff.

Using dd

$ dd if=ifile of=ofile skip=offs count=size status=progress

where skip and count values are in sector counts.

dd_size.txt

- note on byte-size & sector size (for 512-bytes sector size)
01M:     1048576byte @ 000002048sect
01G:  1073741824     @ 002097152
10G: 10737418240     @ 020971520
50G: 53687091200     @ 104857600
80G: 85899345920     @ 167772160

Using find… dumped

$ find . -type d -empty -print
$ find . -type d -empty -delete
 
$ find -type f \( -name "*zip" -o -name "*tar" -o -name "*gz" \) -size +1M -delete
$ find -type f \( -name "*zip" -o -name "*tar" -o -name "*gz" \) -size +1M -exec rm {} +