ttyplot:tldr:c258b

This command performs a series of operations using the utilities ping, sed, and ttyplot in order to display and plot the results of a ping test to the 8.8.8.8 IP address.

Let's dissect the command step by step:

1. ping ${8-8-8-8}: This initiates a ping test to the IP address 8.8.8.8. The ${8-8-8-8} is a way to add this IP address as an argument to the ping command.

2. |: This symbol is a pipe, used to pass the output of one command as input to the next command.

3. sed -u '${s-^-*time=--g; s- ms--g}': The sed command is used here to modify the output of the ping command. -u specifies that sed should output each line immediately, instead of buffering it. The following expression ${s-^-*time=--g; s- ms--g} is a sed script that performs two substitutions on each line:

   • s-^-*time=--g replaces the leading * character (which is used to indicate packet loss) with time=. This helps in retrieving the ping time value for plotting.
   • s- ms--g removes the ms substring, which is the unit of the ping time.

4. |: Another pipe symbol, passing the output of the previous sed command to the next command.

5. ttyplot -t "${ping to 8-8-8-8}" -u ${ms}: This command uses ttyplot to plot the ping times received from the previous commands. The -t "${ping to 8-8-8-8}" option sets the plot's title as "ping to 8.8.8.8", and -u ${ms} sets the y-axis unit as milliseconds.

In summary, this command performs a ping test to 8.8.8.8, modifies the output to retrieve the ping times, and then plots those times using ttyplot with the specified title and unit.