If you're talking Linux, then a terminal would do you just fine.
chmod is used to change file permissions.
Ex: chmod 755 /filename
You could probably use a file manager to do that as well.
In Windows, right click and properties (there are advanced permissions as well that would only be accessible to an administrator).
cacls.exe
Cacls.exe
-p
It depends on where the 000 is being used. For permissions, it would indicate that the file or directory or device has no permissions at all. For the 'umask' it would indicate that all newly created files or directories would have wide open permissions (world read, world write, etc.).
An Editor or a Wordprocessor Which specific program depends on how complex the tasks are that you want to perform and what type of computer you are using.
In Linux the chmod command is used to set file permissions.
TrueUse it to run a program using different permissions than those assigned to the currently logged-on user.A+ Guide to SoftwareChapter 5Page 256
For said purpose, you should use chmod command. Its very helpful, powerful and easy to use. Here is the brief description for chmod command.Commandchmod (Change Mode) SYNOPSISchmod [OPTION]... MODE[,MODE]... FILE... chmod [OPTION]... OCTAL_MODE FILE... chmod [OPTION]... --reference=RFILE FILE... DESCRIPTIONThis manual page documents the GNU version of chmod. chmod changes the permissions of each given file according to mode, which can be either a symbolic representation of changes to make, or an octal number representing the bit pattern for the new permissions. The format of a symbolic mode is `[ugoa...][[+-=][rwxXs­ tugo...]...][,...]'. Multiple symbolic operations can be given, separated by commas. A combination of the letters `ugoa' controls which users' access to the file will be changed: the user who owns it (u), other users in the file's group (g), other users not in the file's group (o), or all users (a). If none of these are given, the effect is as if `a' were given, but bits that are set in the umask are not affected. The operator `+' causes the permissions selected to be added to the existing permissions of each file; `-' causes them to be removed; and `=' causes them to be the only permissions that the file has. The letters `rwxXstugo' select the new permissions for the affected users: read (r), write (w), execute (or access for directories) (x), execute only if the file is a direc­ tory or already has execute permission for some user (X), set user or group ID on execution (s), save program text on swap device (t), the permissions that the user who owns the file currently has for it (u), the permissions that other users in the file's group have for it (g), and the permissions that other users not in the file's group have for it (o). A numeric mode is from one to four octal digits (0-7), derived by adding up the bits with values 4, 2, and 1. Any omitted digits are assumed to be leading zeros. The first digit selects the set user ID (4) and set group ID (2) and save text image (1) attributes. The second digit selects permissions for the user who owns the file: read (4), write (2), and execute (1); the third selects permis­ sions for other users in the file's group, with the same values; and the fourth for other users not in the file's group, with the same values. is not a problem since the permissions of symbolic links are never used. However, for each symbolic link listed on the command line, chmod changes the permissions of the pointed-to file. In contrast, chmod ignores symbolic links encountered during recursive directory traversals. OPTIONS-c, --changes like verbose but report only when a change is made -f, --silent, --quiet suppress most error messages -v, --verbose output a diagnostic for every file processed --reference=RFILE use RFILE's mode instead of MODE values -R, --recursive change files and directories recursively --help display this help and exit --version output version information and exit Each MODE is one or more of the letters ugoa, one of the symbols +-= and one or more of the letters rwxXstugo. Reference URL : http://lowfatlinux.com/linux-chmod-manual.html
A dmg file is an image file used by MAC OS. No program is needed, just click to open. unless your in windows
A disk file used to temporarily save a program or part of a program running in memory
Share permissions
Share permissions