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pigz:tldr:00d0d
This command is using the "pigz" tool to compress a file in parallel using multiple threads. Here is the breakdown of this command:
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"pigz": It is a parallel implementation of gzip compression utility that is used to compress files. It can greatly speed up the compression process by utilizing multiple CPU cores or threads.
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"-0": This is an option that specifies the compression level to be used. In this case, a compression level of 0 is chosen, which means no compression. This option is used to create an uncompressed archive file.
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"-p${4}": This option specifies the number of threads to be used for compression. The number is read from the fourth command-line argument passed to the script or command. The syntax "${4}" is used to access the fourth argument.
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"${filename}": This is the filename or path of the file that you want to compress. It is passed as an argument to the command. The syntax "${filename}" is used to access the value of the "filename" variable.
To summarize, this command is compressing a file using the "pigz" tool with no compression (uncompressed) and using a specified number of threads for parallel processing, as determined by the fourth command-line argument.