dd:tldr:f721c

dd: Check the progress of an ongoing dd operation (run this command from another shell).

kill

$ kill -USR1 $(pgrep ^dd)

try on your machine

This command consists of two parts: "kill" and "$(pgrep ^dd)".

The "kill" command is used to send signals to processes. It is typically used to terminate or control processes running on a Unix-like operating system.

The argument "-USR1" is the signal we want to send. In this case, it is the USR1 signal. Different signals have different meanings and can be used for various purposes.

"$(pgrep ^dd)" is a command substitution that finds the process ID (PID) of a process using the "pgrep" command. The "^dd" argument is a regular expression used to match processes with names starting with "dd".

So, to summarize, this command finds all processes with names starting with "dd" using "pgrep" and sends the USR1 signal to them using "kill". The exact purpose or effect of the USR1 signal on these processes would depend on how they are programmed to handle it.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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