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FutureStarrChmod Calculator: ORR
The chmod calculator is an online tool that allows you to calculate the modes of an archive or directory, and tell you the file permissions you should give each group of permissions.
Setting the setgid permission on a directory ('chmod g+s') causes new files and subdirectories created within it to inherit its group ID, rather than the primary group ID of the user who created the file (the owner ID is never affected, only the group ID). Newly created subdirectories inherit the setgid bit. Thus, this enables a shared workspace for a group without the inconvenience of requiring group members to explicitly change their current group before creating new files or directories. Note that setting the setgid permission on a directory only affects the group ID of new files and subdirectories created after the setgid bit is set, and is not applied to existing entities.
Sometimes however, when looking at a directory listing from “ls -l”, my mind draws a blank when it comes to finding the matching number. This is another way I use my new calculator. I just keep clicking until the “ls” output looks like what the calculator says and I know what chmod value I’m looking at.With this chmod calculator, you will quickly find out how to set the permissions of your files. On top of the calculations, we'll briefly explain what chmod is, give you a quick chmod example, as well as a linux permission chart. Also, if you want to check what those mysterious numbers next to the chmod command mean, you can do it with this permissions calculator.Chmod means ‘change mode’ and it changes file or directory mode bits (the way a file can be accessed). You can use chmod in the command line to change file or directory permissions on unix or unix-like systems such as linux or BSD. (Source: chmodcommand.com)