what is a file ? Post: 302708459

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Top Forums UNIX for Dummies Questions & Answers what is a file ? Post 302708459 by Corona688 on Monday 1st of October 2012 03:08:22 PM

10-01-2012

Registered User

Quote:

Originally Posted by Arun_Linux

3) Does all files have metadata ?

Depends what you mean by metadata. All files have a file name, change-time, modification-time, access-time(though that's frequently left alone), size, and other such things you'd expect of a file, which are not stored inside the file data itself.

Quote:

6) Is it possible to create my own file and a file editor, such that no other file editor (e.g vi) could read it ?

A file is a file. Even if you don't understand the contents you can still look at it unless you don't have permissions to do so. If you want to prevent people from looking at what's in it, chmod -r is more effective than obfuscating the contents.

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LEARN ABOUT SUNOS

touch

touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME

       touch - change file access and modification times

SYNOPSIS

       /usr/ucb/touch [-acfm] file...

DESCRIPTION

       touch sets the access and modification times of each file to the current time. file is created if it does not already exist.

OPTIONS

       -a	Change the access time of file. Do not change the modification time unless -m is also specified.

       -c	Do not create file if it does not exist.

       -f	Attempt to force the touch in spite of read and write permissions on file.

       -m	Change the modification time of file. Do not change the access time unless -a is also specified.

USAGE

       See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXIT STATUS

       The following exit values are returned:

       0	touch executed successfully and all requested changes were made.

       >0	An error occurred. touch returns the number of files for which the times could not be successfully modified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       touch(1), attributes(5), largefile(5)

SunOS 5.10							    26 Oct 1995 							 touch(1B)