UNIX Recycle Bin - restore function Post: 302472504

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Homework and Emergencies Homework & Coursework Questions UNIX Recycle Bin - restore function Post 302472504 by Corona688 on Wednesday 17th of November 2010 09:51:39 AM

11-17-2010

Registered User

Quote:

Originally Posted by DGPickett

What is it with tar, a command so old it it like going to rent a car and taking the 1962 VW beetle, especially when not leaving the host!

tar is simple, efficient, and works. cpio also works, but its syntax is far more tortuous.

tar also has advantages over cp in some ways. I occasionally prefer it over cp in situations where I need to be very careful where it extracts because cp -R is entirely willing to create a new destination directory even when you didn't mean to. tar on the other hand is very precise and strict about what it creates where.

As for your continual harangues on tar's inefficiency:

Code:

# directory of tiny tiny files
$ du -hs ./code
187M        ./code
# creating a tarball of it
$ tar -cf code.tar code
# Did tar waste gigatons of space?
$ du -hs ./code.tar
184M
# NO, it didn't!  Don't believe me?  Let's look closer.
$ du -s ./code ./code.tar
188236	./code.tar
191296	./code
# Now we create a CPIO archive, which should be wayyyyy better right?
$ find ./code -type f -depth -print | cpio -ov > ./code.cpio
$ ls -l code.tar code.cpio
-rw-r--r-- 1 monttyle monttyle 192747520 Nov 17 08:14 ../code.tar
-rw-r--r-- 1 monttyle monttyle 191435776 Nov 17 08:22 ../code.cpio
$

...and even that minute 0.5% extra reduces to 26 kilobytes out of 100 megs when you compress -- 0.02%.

So tar works absolutely fine, and you really don't need to tell us how awful it is all the time. Thank you.

Corona688

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LEARN ABOUT OPENSOLARIS

mktemp

mktemp(3C)						   Standard C Library Functions 						mktemp(3C)

NAME

       mktemp - make a unique file name  from a template

SYNOPSIS

       #include <stdlib.h>

       char *mktemp(char *template);

DESCRIPTION

       The  mktemp() function replaces the contents of the string pointed to by template with a unique file name, and returns template. The string
       in template should look like a file name with six trailing 'X's; mktemp() will replace the 'X's with a character string that can be used to
       create a unique file name. Only 26 unique file names per thread can be created for each unique template.

RETURN VALUES

       The mktemp() function returns the pointer template. If a unique name cannot be created, template points to a null string.

ERRORS

       No errors are defined.

EXAMPLES

       Example 1 Generate a filename.

       The  following example replaces the contents of the "template" string with a 10-character filename beginning with the characters "file" and
       returns a pointer to the "template" string that contains the new filename.

	 #include <stdlib.h>
	 ...
	 char *template = "/tmp/fileXXXXXX";
	 char *ptr;
	 ptr = mktemp(template);

USAGE

       Between the time a pathname is created and the file opened, it is possible for some other process to create a file with the same name.  The
       mkstemp(3C) function avoids this problem and is preferred over this function.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mkstemp(3C), tmpfile(3C), tmpnam(3C), attributes(5), standards(5)

SunOS 5.11							    15 Sep 2004 							mktemp(3C)