DOS 命令DIR参数
dir的排序方式参数g表示按目录在前文件在后的顺序显示。
那么g代表什么英文字母？

[解决办法]
G 组目录优先

是不是Group，组的意思？
[解决办法]
sortorder N By name (alphabetic) S By size (smallest first)
E By extension (alphabetic) D By date/time (oldest first)
G Group directories first - Prefix to reverse order

C/C++ code

>dir /?Displays a list of files and subdirectories in a directory.DIR [drive:][path][filename] [/A[[:]attributes]] [/B] [/C] [/D] [/L] [/N]  [/O[[:]sortorder]] [/P] [/Q] [/R] [/S] [/T[[:]timefield]] [/W] [/X] [/4]  [drive:][path][filename]              Specifies drive, directory, and/or files to list.  /A          Displays files with specified attributes.  attributes   D  Directories                R  Read-only files               H  Hidden files               A  Files ready for archiving               S  System files               I  Not content indexed files               L  Reparse Points             -  Prefix meaning not  /B          Uses bare format (no heading information or summary).  /C          Display the thousand separator in file sizes.  This is the              default.  Use /-C to disable display of separator.  /D          Same as wide but files are list sorted by column.  /L          Uses lowercase.  /N          New long list format where filenames are on the far right.  /O          List by files in sorted order.  sortorder    N  By name (alphabetic)       S  By size (smallest first)               E  By extension (alphabetic)  D  By date/time (oldest first)               G  Group directories first    -  Prefix to reverse order  /P          Pauses after each screenful of information.  /Q          Display the owner of the file.  /R          Display alternate data streams of the file.  /S          Displays files in specified directory and all subdirectories.  /T          Controls which time field displayed or used for sorting  timefield   C  Creation              A  Last Access              W  Last Written  /W          Uses wide list format.  /X          This displays the short names generated for non-8dot3 file              names.  The format is that of /N with the short name inserted              before the long name. If no short name is present, blanks are              displayed in its place.  /4          Displays four-digit yearsSwitches may be preset in the DIRCMD environment variable.  Overridepreset switches by prefixing any switch with - (hyphen)--for example, /-W.