Topics

• GnuPG (GPG)
• Services
• Secure Shell (SSH)
• tee command
• Change root (chroot)
• Regex Pitfalls

Examples

• Generate public and private key
• Write output to stdout, and also to a file
• Write output from the middle of a pipe chain to a file and pass it back to the pipe
• write the output to multiple files
• Instruct tee command to append to the file
• Systemd service management
• Manually changing root in a directory
• Requirements
• Reasons to use chroot
• Why doesn't dot (.) match the newline character ("\n")?
• Why does a regex skip some closing brackets/parentheses and match them afterwards?