Miscellaneous Programs • --show ,  -s • --verbose ,  -v • --version ,  -V my_print_defaults  masks passwords by default. Use this option to display passwords as cleartext. Verbose mode. Print more information about what the program does. Display version information and exit. The  lz4_decompress  utility decompresses  mysqlpump  output that was created using LZ4 compression. 4.8 Miscellaneous Programs 4.8.1 lz4_decompress — Decompress mysqlpump LZ4-Compressed Output Note If MySQL was configured with the  -DWITH_LZ4=system  option, lz4_decompress  is not built. In this case, the system  lz4  command can be used instead. Invoke  lz4_decompress  like this: lz4_decompress  input_file output_file Example: mysqlpump --compress-output=LZ4 > dump.lz4 lz4_decompress dump.lz4 dump.txt To see a help message, invoke  lz4_decompress  with no arguments. To decompress  mysqlpump  ZLIB-compressed output, use  zlib_decompress . See Section 4.8.3, “zlib_decompress — Decompress mysqlpump ZLIB-Compressed Output” . perror  displays the error message for MySQL or operating system error codes. Invoke  perror  like this: perror [ options ]  errorcode  ... 4.8.2 perror — Display MySQL Error Message Information perror  attempts to be flexible in understanding its arguments. For example, for the ER_WRONG_VALUE_FOR_VAR  error,  perror  understands any of these arguments:  1231 ,  001231 , MY-1231 , or  MY-001231 , or  ER_WRONG_VALUE_FOR_VAR . If an error number is in the range where MySQL and operating system errors overlap,  perror  displays both error messages: shell>  perror 1231 MySQL error code MY-001231 (ER_WRONG_VALUE_FOR_VAR): Variable ’%-.64s’ can’t be set to the value of ’%-.200s’ shell>  perror 1 13 OS error code 1: Operation not permitted MySQL error code MY-000001: Can’t create/write to file ’%s’ (OS errno %d - %s) 630