Compressing Files

tar

Create

tar -czvf filename.tar.gz /path/to/dir1

List Files

tar -tvf file.tar.gz

The dd command makes a bit-by-bit copy of a file, a filesystem, or even an entire hard drive. This means that even deleted files are copied

dd if=/dev/sdb of=/tmp/sdb_copy

if is the input file, of is the output file. Other useful arguments are bs which is the block size of each copy (sector size is 4096 bytes) and conv:noerror which ignores errors.

Concat Two Zips

zip -s 0 masked-logs-prod.zip --out full_logs.zip