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What is the meaning of the hyphen in '-rwxrwxrwx'

I am using ubuntu linux server. When I check file permissions with ls -l. All file permissions begin with a hyphen (-).

Example:

-rwxrwxrwx  1 www-data www-data   418 Sep 25  2013 index.php
-rwxrwxrwx  1 www-data www-data 19930 Apr  9 23:50 license.txt
-rwxrwxrwx  1 www-data www-data  7194 May  7 20:43 readme.html
-rwxrwxrwx  1 www-data www-data  4896 Dec 24  2013 wp-activate.php
drwxrwxrwx  9 www-data www-data  4096 Jul 18 10:03 wp-admin
-rwxrwxrwx  1 www-data www-data   271 Jan  8  2012 wp-blog-header.php
-rwxrwxrwx  1 www-data www-data  4818 Feb 18 21:45 wp-comments-post.php
-rwxrwxrwx  1 www-data www-data  3361 Jul 18 10:02 wp-config.php
-rwxrwxrwx  1 www-data www-data  3087 Oct 24  2013 wp-config-sample.php
drwxrwxrwx  5 www-data www-data  4096 Jul 18 10:14 wp-content
-rwxrwxrwx  1 www-data www-data  2932 Sep 25  2013 wp-cron.php
drwxrwxrwx 12 www-data www-data  4096 May  8 17:45 wp-includes
-rwxrwxrwx  1 www-data www-data  2380 Oct 24  2013 wp-links-opml.php
-rwxrwxrwx  1 www-data www-data  2359 Oct 24  2013 wp-load.php
-rwxrwxrwx  1 www-data www-data 32671 Apr 13 16:06 wp-login.php
-rwxrwxrwx  1 www-data www-data  8235 Nov 13  2013 wp-mail.php
-rwxrwxrwx  1 www-data www-data 11070 Apr  7 20:15 wp-settings.php
-rwxrwxrwx  1 www-data www-data 25665 Nov 13  2013 wp-signup.php
-rwxrwxrwx  1 www-data www-data  4026 Oct 24  2013 wp-trackback.php
-rwxrwxrwx  1 www-data www-data  3032 Feb  9 20:39 xmlrpc.php

What is the meaning of this hyphen?

Some permissions start with d.

I can not understand this character first position. Please help me.

Note: I know about these symbols r = read , w = write , x = execute.

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3 answers

Here are the possible values ​​for the first character from the manual (type man lsin the command line):

       b     Block special file.
       c     Character special file.
       d     Directory.
       l     Symbolic link.
       s     Socket link.
       p     FIFO.
       -     Regular file.
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d . , , - .

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Pay attention to dbefore some elements. The first bit distinguishes ddirectories from other files (where hyphen indices are NOT directories).

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