lz4:tldr:fde77

lz4: Compress a file using the best compression.

$ lz4 -9 ${filename}

try on your machine

The command "lz4 -9 $filename" is used to compress a file using the LZ4 compression algorithm with the highest compression level.

Here's a breakdown of the different parts of the command:

"lz4": This is the name of the LZ4 compression tool. It is used to perform compression and decompression of files.
"-9": This is an option or flag provided to the lz4 command. In this case, "-9" is used to specify the highest compression level. Higher compression levels usually result in smaller file sizes but at the cost of increased compression time.
"$filename": This is a placeholder for the name of the file you want to compress. The "$" symbol is used to reference a variable, which is substituted with the actual value when the command is executed. In this case, the value of the variable "filename" is expected to be provided as an argument to the command.

So, when you run the command "lz4 -9 $filename", it will compress the file specified by the variable "filename" using the LZ4 compression algorithm with the highest compression level.

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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