HOWTOs, tips and tricks

Administration:

• HOWTO create new VirtualBox VM using command line
• HOWTO setup LDAP client
• HOWTO send test mail via SMTP
• HOWTO setup LXC container
• HOWTO setup Exim4 to work with Gmail account
• HOWTO create app password to use Google services
• HOWTO test network bandwidth and latency
• HOWTO simulate network bandwidth and latency
• Generate OpenVPN configuration
• Change OpenVPN key password inside config file: openvpn-change-key-pass.sh
• HOWTO setup traffic routing via OpenVPN server using NAT
• HOWTO reset Windows 10 password using Linux

• HOWTO make a Windows 10 and 11 bootable USB stick on Linux

• Make wildcard include hidden files:

  shopt -s dotglob
  

• Make .deb package from source:

  # instead of `make install`
  checkinstall
  

• Show SSL certificate details:

  openssl x509 -in example.pem -text
  

• Get SSL certificates from server:

  openssl s_client -showcerts -servername www.example.com -connect  www.example.com:443 </dev/null
  

• Use socat to interact with USB/UART adapter (Ctrl+X to exit socat):

  socat -,raw,echo=0,escape=0x18 /dev/ttyUSB0,b115200,raw,echo=0
  

• Check keyboard and mouse X Window events:

  xev
  

• Run a shell with limited amount of memory:

  systemd-run -p MemoryMax=1G -p MemorySwapMax=0 --shell
  

• Add PulseAudio sink which combines all other sinks:

  pactl load-module module-combine-sink
  

Coding:

• Using GRPC in Java Maven project
• HOWTO move files between Git repositories preserving history
• HOWTO install Android SDK using command line tools
• HOWTO install rospy ROS Noetic module to Ubuntu 18.04
• HOWTO use fluentd to post errors into Slack channel
• HOWTO get specific revision from Git repo without getting history
• Convert under_score to camelCase by sed:

  sed -E 's/([^ ])_(.)/\1\U\2/g'
  

• Grep binary string:

  grep -RobUaP 'S\x00O\x00M\x00E\x00T\x00H\x00I\x00N\x00G' <dir>
  

Misc:

• HOWTO capture VHS video using Pinnacle Dazzle DVC100 on Linux