make-it-executable-ask-ubuntu.txt

https://askubuntu.com/questions/484718/how-to-make-a-file-executable

Just run:

chmod +x /path/to/your/file.txt

Note that chmod does also have some more advanced options. It accepts three groups of options, represented as --- --- ---. The first set of --- is User. The second is Group and the last is Other (everyone else).

r stands for Read, w for Write and x for eXecute.

To allow everyone to read it, but only Group to execute and User to read and write it would be -rw- rx- r--. This would be added to the command as:

chmod +rw-rx-r-- /path/to/file.extension

chmod also can do this in numbers. It is based on binary.

So there are these numbers:

Execute by user is 100. Execute by group is 010. Execute by other is 001

Write by user is 200. Write by group is 020. Write by other is 002.

Read by user is 400. Read by group is 040. Read by other is 004.

Then you add these together to get the desired combination.

So to allow everyone to read it, but only Group to execute and User to write it would be 400 + 040 + 004 and 010 and 200

That adds up to 600 + 050 + 004 = 654.

You could then run the command.

chmod +654 /path/to/file.extension

to set it. So to set all permissions you can run:

chmod +rwxrwxrwx /path/to/file.extension

or

chmod +777 /path/to/file.extension

Finally, you can do:

chmod -777 /path/to/file.extension

To take all permissions away from everyone.

And:

chmod +300 /path/to/file.extension

To add read and write for the user, without affecting any other permissions (e.g. Execute permissions).

This website has a very useful little tool, whereby you can tick the options you want and it gives you the command:

However, not all the possible combinations are sensible to use; the main ones that are used are the following:

    755 - Owner has all, and Group and Other can read and execute

    700 - Owner has all

    644 - Owner can read and write, and Group and Other can read

    600 - Owner can read and write

And, if you're using non-trivial user groups:

    775 - Owner can read and write, and Group and Other can read

    770 - Owner and Group have all, and Other can read and execute

    750 - Owner has all, and Group can read and execute

    664 - Owner and Group can read and write, and Other can just read

    660 - Owner and Group can read and write

    640 - Owner can read and write, and Group can read

777 and 666 are rarely used, except in /tmp.