*** zstd command line interface 64-bits v1.5.3, by Yann Collet ***
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. During decompression and when the output
                       destination is stdout, pass-through unrecognized formats as-is.
      --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

Advanced options :
  -V, --version        display Version number and exit
  -c, --stdout         write to standard output (even if it is the console), keep original file
  -v, --verbose        verbose mode; specify multiple times to increase verbosity
  -q, --quiet          suppress warnings; specify twice to suppress errors too
      --[no-]progress  forcibly display, or never display the progress counter
                       note: any (de)compressed output to terminal will mix with progress counter text
  -r                   operate recursively on directories
     --filelist FILE   read list of files to operate upon from FILE
     --output-dir-flat DIR :  processed files are stored into DIR
     --output-dir-mirror DIR :  processed files are stored into DIR respecting original directory structure
     --[no-]asyncio    use asynchronous IO (default: enabled)
     --[no-]check      during compression, add XXH64 integrity checksum to frame (default: enabled)
                       if specified with -d, decompressor will ignore/validate checksums in compressed frame (default: validate)
     --trace FILE      log tracing information to FILE
     --                all arguments after "--" are treated as files

Advanced compression options :
     --ultra           enable levels beyond 19, up to 22 (requires more memory)
     --fast[=#]        switch to very fast compression levels (default: 1)
     --long[=#]        enable long distance matching with given window log (default: 27)
     --patch-from=FILE :  specify the file to be used as a reference point for zstd's diff engine. 
     --adapt           dynamically adapt compression level to I/O conditions
  -T#                  spawn # compression threads (default: 1, 0==# cores) 
  -B#                  select size of each job (default: 0==automatic) 
     --single-thread   use a single thread for both I/O and compression (result slightly different than -T1) 
     --auto-threads={physical,logical} :  use either physical cores or logical cores as default when specifying -T0 (default: physical)
     --rsyncable       compress using a rsync-friendly method (-B sets block size) 
     --exclude-compressed :  only compress files that are not already compressed 
     --stream-size=#   specify size of streaming input from `stdin` 
     --size-hint=#     optimize compression parameters for streaming input of approximately this size 
     --target-compressed-block-size=# :  generate compressed block of approximately targeted size 
     --no-dictID       don't write dictID into header (dictionary compression only)
     --[no-]compress-literals :  force (un)compressed literals
     --[no-]row-match-finder :  force enable/disable usage of fast row-based matchfinder for greedy, lazy, and lazy2 strategies
     --format=zstd     compress files to the .zst format (default)
     --format=gzip     compress files to the .gz format

Advanced decompression options :
  -l                   print information about zstd compressed files
     --test            test compressed file integrity
  -M#                  Set a memory usage limit for decompression
     --[no-]sparse     sparse mode (default: disabled)
     --[no-]pass-through : passes through uncompressed files as-is (default: disabled)

Dictionary builder :
     --train ##        create a dictionary from a training set of files
     --train-cover[=k=#,d=#,steps=#,split=#,shrink[=#]] :  use the cover algorithm with optional args
     --train-fastcover[=k=#,d=#,f=#,steps=#,split=#,accel=#,shrink[=#]] :  use the fast cover algorithm with optional args
     --train-legacy[=s=#] :  use the legacy algorithm with selectivity (default: 9)
  -o DICT              DICT is dictionary name (default: dictionary)
     --maxdict=#       limit dictionary to specified size (default: 112640)
     --dictID=#        force dictionary ID to specified value (default: random)

Benchmark options : 
  -b#                  benchmark file(s), using # compression level (default: 3)
  -e#                  test all compression levels successively from -b# to -e# (default: 1)
  -i#                  minimum evaluation time in seconds (default: 3s)
  -B#                  cut file into independent chunks of size # (default: no chunking)
  -S                   output one benchmark result per input file (default: consolidated result)
     --priority=rt     set process priority to real-time