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Operating Systems Linux Fedora od -c . does not work on mine Post 302399336 by drl on Saturday 27th of February 2010 10:08:02 AM
Old 02-27-2010
Hi.

Of the systems on which I tried to use od with a directory, Solaris 10 failed, but (some versions of) IBM AIX, and HP-UX succeeded.

The K & R book was written a long time ago, before Linux was created. I do not know why Linux restricts commands like cat and od from dealing with directories.

The chmod behavior might be explained by the setting of your umask. See man umask for details ... cheers, drl
 

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MKDIR(1)						    BSD General Commands Manual 						  MKDIR(1)

NAME
mkdir -- make directories SYNOPSIS
mkdir [-p] [-m mode] directory_name ... DESCRIPTION
mkdir creates the directories named as operands, in the order specified, using mode rwxrwxrwx (0777) as modified by the current umask(2). The options are as follows: -m Set the file permission bits of the final created directory to the specified mode. The mode argument can be in any of the formats specified to the chmod(1) utility. If a symbolic mode is specified, the operation characters ``+'' and ``-'' are interpreted rela- tive to an initial mode of ``a=rwx''. -p Create intermediate directories as required. If this option is not specified, the full path prefix of each operand must already exist. Intermediate directories are created with permission bits of rwxrwxrwx (0777) as modified by the current umask, plus write and search permission for the owner. Do not consider it an error if the argument directory already exists. The user must have write permission in the parent directory. EXIT STATUS
mkdir exits 0 if successful, and >0 if an error occurred. SEE ALSO
chmod(1), rmdir(1), mkdir(2), umask(2) STANDARDS
The mkdir utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD
January 25, 1994 BSD
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