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Full Discussion: C Brain Teaser
Top Forums Programming C Brain Teaser Post 302116867 by vino on Wednesday 9th of May 2007 05:53:31 AM
Old 05-09-2007
Quote:
Originally Posted by vrk1219

Write a C program to do a small task(lets say just simply printing a "Hello World" or so) such that the program should only give output or the desired result ony once after it got compiled and should never give the output nor do anything else. The program should not make use of files or any extrnal means of storing some data.
You did not place any restrictions on what not to do. One way could be to remove yourself after the program execution.
Code:
[/tmp]$ cat try.cpp
#include <stdio.h>
#include <unistd.h>

int main (int argc, char* argv[])
{
    printf ("Bye Bye Cruel World :-( \n");
    return (unlink (argv[0]));
}
[/tmp]$ gcc -o try try.cpp -lstdc++
[/tmp]$ ls -l try
-rwxr-xr-x  1 xxxxxx g900 5202 May  9 02:51 try
[/tmp]$ ./try
Bye Bye Cruel World :-( 
[/tmp]$ ls -l try
ls: try: No such file or directory
[/tmp]$

 

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LEARN ABOUT OSF1

dh_movefiles

DH_MOVEFILES(1) 						     Debhelper							   DH_MOVEFILES(1)

NAME

       dh_movefiles - move files out of debian/tmp into subpackages

SYNOPSIS

       dh_movefiles [debhelperoptions] [--sourcedir=dir] [-Xitem] [file...]

DESCRIPTION

       dh_movefiles is a debhelper program that is responsible for moving files out of debian/tmp or some other directory and into other package
       build directories. This may be useful if your package has a Makefile that installs everything into debian/tmp, and you need to break that
       up into subpackages.

       Note: dh_install is a much better program, and you are recommended to use it instead of dh_movefiles.

FILES

       debian/package.files
	   Lists the files to be moved into a package, separated by whitespace. The filenames listed should be relative to debian/tmp/. You can
	   also list directory names, and the whole directory will be moved.

OPTIONS

       --sourcedir=dir
	   Instead of moving files out of debian/tmp (the default), this option makes it move files out of some other directory. Since the entire
	   contents of the sourcedir is moved, specifying something like --sourcedir=/ is very unsafe, so to prevent mistakes, the sourcedir must
	   be a relative filename; it cannot begin with a `/'.

       -Xitem, --exclude=item
	   Exclude files that contain item anywhere in their filename from being installed.

       file ...
	   Lists files to move. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory
	   will be moved. It is an error to list files here unless you use -p, -i, or -a to tell dh_movefiles which subpackage to put them in.

NOTES

       Note that files are always moved out of debian/tmp by default (even if you have instructed debhelper to use a compatibility level higher
       than one, which does not otherwise use debian/tmp for anything at all). The idea behind this is that the package that is being built can be
       told to install into debian/tmp, and then files can be moved by dh_movefiles from that directory. Any files or directories that remain are
       ignored, and get deleted by dh_clean later.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2							    2018-05-10							   DH_MOVEFILES(1)
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