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du: List the human-readable size of all `.jpg` files in subdirectories of the current directory, and show a cumulative total at the end.
$ du -ch ${*-*-jpg}
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The command "du -ch ${--jpg}" can be broken down as follows:

  1. "du" is a command used in Unix-like operating systems to estimate and display the disk usage of files and directories.
  2. The option "-c" is used to show a grand total of the disk usage at the end of the output.
  3. The "${--jpg}" is a shell expansion that matches any files or directories that have a filename pattern in the format of "YYYY-MM-DD.jpg". The asterisk (*) is a wildcard character that represents any characters, and the hyphen (-) is used to separate the year, month, and day in the filename.

So, when the command is executed, it will calculate and display the disk usage of all files or directories that have filenames in the pattern of "YYYY-MM-DD.jpg". At the end of the output, it will also show the total disk usage of all the matched files or directories.

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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