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gawk: Extension Sample Readdir

 
 16.7.6 Reading Directories
 --------------------------
 
 The 'readdir' extension adds an input parser for directories.  The usage
 is as follows:
 
      @load "readdir"
 
    When this extension is in use, instead of skipping directories named
 on the command line (or with 'getline'), they are read, with each entry
 returned as a record.
 
    The record consists of three fields.  The first two are the inode
 number and the file name, separated by a forward slash character.  On
 systems where the directory entry contains the file type, the record has
 a third field (also separated by a slash), which is a single letter
 indicating the type of the file.  The letters and their corresponding
 file types are shown in Table 16.3 table-readdir-file-types.
 
 Letter  File type
 --------------------------------------------------------------------------
 'b'     Block device
 'c'     Character device
 'd'     Directory
 'f'     Regular file
 'l'     Symbolic link
 'p'     Named pipe (FIFO)
 's'     Socket
 'u'     Anything else (unknown)
 
 Table 16.3: File types returned by the 'readdir' extension
 
    On systems without the file type information, the third field is
 always 'u'.
 
      NOTE: On GNU/Linux systems, there are filesystems that don't
      support the 'd_type' entry (see the readdir(3) manual page), and so
      the file type is always 'u'.  You can use the 'filefuncs' extension
      to call 'stat()' in order to get correct type information.
 
    Here is an example:
 
      @load "readdir"
      ...
      BEGIN { FS = "/" }
      { print "file name is", $2 }
 

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