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Full Discussion: help on umask
Operating Systems Linux help on umask Post 302184274 by suvendu4urs on Friday 11th of April 2008 04:45:44 AM
Old 04-11-2008
Quote:
Originally Posted by era
If you were not allowed to change it under any circumstances, it ought to be impossible. But you can. However, you should be aware of the security implications. If you set it too loose, people will be creating private files in their home directories which are readable by anyone -- if that's acceptable then go ahead. (Setting it tighter than the default is usually not a problem.)

Sounds like you might be barking up the wrong tree, though. Could you describe what problem you are trying to solve? If you want files in a shared directory to be created with specific permissions, maybe your platform would offer a facility for this by other means (for example, by using the setgid bit on the directory, on some platforms).

i want to change the file permisiion without using any command.mean i want to change it using umask only.so i want to know without doing any calculation shall we come to know that what is the vlaue of file permission like is it 0666 or anyother.but without doing any calculation.we can do like this or not?
thats what i want to know
thank u
 

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LNDIR(1)						      General Commands Manual							  LNDIR(1)

NAME
lndir - create a shadow directory of symbolic links to another directory tree SYNOPSIS
lndir [ options ] fromdir [ todir ] DESCRIPTION
The lndir program makes a shadow copy todir of a directory tree fromdir, except that the shadow is not populated with real files but instead with symbolic links pointing at the real files in the fromdir directory tree. This is usually useful for maintaining source code for different machine architectures. You create a shadow directory containing links to the real source, which you will have usually mounted from a remote machine. You can build in the shadow tree, and the object files will be in the shadow directory, while the source files in the shadow directory are just symlinks to the real files. This scheme has the advantage that if you update the source, you need not propagate the change to the other architectures by hand, since all source in all shadow directories are symlinks to the real thing: just cd to the shadow directory and recompile away. The todir argument is optional and defaults to the current directory. The fromdir argument may be relative (e.g., ../src) and is relative to todir (not the current directory). If you add files, simply run lndir again. New files will be silently added. Old files will be checked that they have the correct link. Deleting files is a more painful problem; the symlinks will just point into never-never land. OPTIONS
-silent Normally lndir outputs the name of each subdirectory as it descends into it. The -silent option suppresses these status messages. -silent may be abbreviated to -s. -ignorelinks If a file in fromdir is a symbolic link, lndir will make the same link in todir rather than making a link back to the (symbolic link) entry in fromdir. The -ignorelinks option changes this behavior. The link created in todir will point back to the corre- sponding (symbolic link) file in fromdir. If the link is to a directory, this is almost certainly the wrong thing. The -ignore- links option may be abbreviated to -i. -withsymdirs If a file in fromdir is a symbolic link to a directory and the -withsymdirs option is specified, lndir will shadow the directory tree the symbolic link points to, whether or not the -ignorelinks is also specified. The -withsymdirs option may be abbreviated to -d. -clean lndir will remove dangling symbolic links and empty directories in the shadow tree. The -clean option may be abbreviated to -c. -cleanonly lndir will do the cleaning phase only, not creating the shadow tree. The todir argument may be provided, and defaults to the cur- rent directory when not provided. -withrevinfo lndir will normally not shadow any BitKeeper, RCS, SCCS, CVS, CVS.adm and .svn subdirectories, nor any .cvsignore and .gitignore files. This option causes these directories and files to be treated as any other, rather than ignored. -withrevinfo may be short- ened to -r. -noexceptions By default, lndir does not shadow files or directories whose name is .DS_Store, or ._.DS_Store, or starts with '.#', or ends in '~'. This option, which may be abbreviated to -E, causes such files to also be shadowed. -except This option adds name to an initially empty list of filenames in fromdir that are not to be shadowed. -except may be specified as -e. This option may be repeated as many times as necessary. DIAGNOSTICS
The program displays the name of each subdirectory it enters, followed by a colon. The -silent option suppresses these messages. A warning message is displayed if the symbolic link cannot be created. The usual problem is that a regular file of the same name already exists. If the link already exists but doesn't point to the correct file, the program prints the link name and the location to which it does point. XFree86 Version 4.7.0 LNDIR(1)
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