Reproducible
engineering
experiments

When apt pauses at “0% Connecting,” the last displayed address is evidence, not a diagnosis. Determine whether DNS, IPv6 routing, IPv4 routing, a proxy, TLS, a captive portal, the selected mirror, or an unsupported Ubuntu release is failing before changing system-wide address selection.

Rfkill is a tool for enabling and disabling wireless devices. We use “rfkill list” command as below … Read more

Rfkill is a tool for enabling and disabling wireless devices. Using “rfkill list” command we first check … Read more

Create a temporary audio loopback from a named microphone source to a named speaker or headphone sink using pactl. Start at a conservative volume and latency, save the returned module ID, unload that module to stop monitoring, and control acoustic feedback before turning anything up.

Ubuntu supports various media player which allow you to play audio and video from command line. Mplayer … Read more

For testing FTP server connection from Ubuntu command line, we can use following command, Connected to my_ftp_server_IP220———- … Read more

SSHFS is a file system in user space (FUSE) that uses the SSH File Transfer Protocol (SFTP) … Read more

Use scp for a straightforward one-off copy, rsync over SSH for repeatable or resumable directory synchronization, SFTP for interactive/file-oriented workflows, and a tar stream for carefully controlled archive pipelines. The protocol encrypts transport; you still need host verification, least privilege, safe destination semantics, and end-to-end validation.

On Local Machine, from where you will try to login another machine, we need to use ssh-keygen … Read more