+ zstd -h
Usage: zstd *OPTION*... *FILE*... *-o file*
Compress or uncompress FILEs (with no FILE or when FILE is `-`, read from standard input).

  -o file              result stored into `file` (only 1 output file)
  -1 .. -19            compression level (faster .. better; default: 3)
  -d, --decompress     decompression
  -f, --force          disable input and output checks. Allows overwriting existing files,
                       input from console, output to stdout, operating on links,
                       block devices, etc.
      --rm             remove source file(s) after successful de/compression
  -k, --keep           preserve source file(s) (default)
  -D DICT              use DICT as Dictionary for compression or decompression
  -h                   display usage and exit
  -H,--help            display long help and exit

+ zstd -H
...
Advanced options :
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+ zstd --help
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Advanced options :
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