Saying hi & a question about permissions

[gulyman]

Hi there. While searching for a way to open .bin files on Ubuntu I came to this forum. I've been using Ubuntu for about 4 months, and am starting to delve into the command line. Sometimes when I look up guides to install programs it says to use chmod 775. At least I think that was what it was. Something to do with permissions. What does the 775 indicate? are there other numbers you can use instead?

[oz]

Welcome to the forums, gulyman!

Take a look at this tutorial for info on Linux permissions.

[i92guboj]

Hi there. While searching for a way to open .bin files on Ubuntu I came to this forum. I've been using Ubuntu for about 4 months, and am starting to delve into the command line. Sometimes when I look up guides to install programs it says to use chmod 775. At least I think that was what it was. Something to do with permissions. What does the 775 indicate? are there other numbers you can use instead?

4 is read
2 is write
1 is exec

The permissions are specified on this order: user/group/others

So, 775 means:

4+2+1 (all permissions) for user
4+2+1 (all permissions) for group
1+4 (exec and read, but not write) for others

664, for example, would be:

4+2 (read and write) for user
4+2 (read and write) for group
4 (read only) for others

740 would be:

4+2+1 (all) for user
4 (read) for group
0 (no permissions at all) for others

All the info you need is on the man page for chmod.

[gulyman]

Thanks that was pretty helpful. Ther sure is alot of stuff to memorize in the command line.

[dxqcanada]

That's why the All-Mighty Unix creator made "man".