pigz:tldr:44c41

The command "pigz ${filename}" is a compression command that uses the "pigz" program to compress a file specified by the variable "filename".

Here's a breakdown of the command:

• "pigz": This is the name of the program used for compression. "pigz" stands for parallel implementation of gzip, and it is a utility for compressing files in parallel using multiple threads.
• "${filename}": This is a variable placeholder that represents the name of the file you want to compress. You would replace "${filename}" with the actual name of the file you want to compress.

So, when you execute the command "pigz ${filename}", the "pigz" program will compress the specified file using its compression algorithm and create a compressed file with a .gz extension.

For example, if you have a file called "mydata.csv", you would execute the command as "pigz mydata.csv". This would compress the "mydata.csv" file and create a compressed file called "mydata.csv.gz".