How to mount software RAID1 member using mdadm

Just a moment ago I connected my old hard drive and realized that it was a RAID member.


How to quickly download or upload directory tree over FTP

The fastest way to download or upload directory tree over FTP using just plain console is to execute lftp command.


How to determine current run-level using Linux

To print current run-level execute:

$ who -r
run-level 3  2012-01-17 17:06

To print previous and current run-level execute:

$ sudo runlevel
N 3
SecOps SysOps

How to check established TCP connections

Display established TCP connections inside the terminal.

VLC – quick solution for problems with HTTPS certs

Certificate could not be verified error.