filefrag:tldr:3608f

The command "filefrag" is used to report file fragmentation and to defragment files in a filesystem. In this case, the command is being used with two filename arguments: ${filename1} and ${filename2}.

The specific meaning of ${filename1} and ${filename2} would depend on the context in which this command is being used. They are likely variables that represent the names of two files for which you want to check the fragmentation.

When you run this command, it will analyze the specified files and report information about their fragmentation. The output will provide details on the fragmentation status of the files, such as the number of fragments, the size of each fragment, and the percentage of fragmentation. This information can be useful in understanding how files are stored on the filesystem and whether defragmentation might be beneficial.