To write-protect a file from the command line on Apple OS X, you can use the chflags command with the uchg option. This will set the user immutable flag on the file, which will prevent it from being modified or deleted by any user, including the root user.
To write-protect a file using the chflags command, you can run the following command, replacing /path/to/file with the actual path to the file:
chflags uchg /path/to/file
This will set the user immutable flag on the file, which will prevent it from being modified or deleted.
To remove the write-protection from the file, you can use the chflags command with the nouchg option. For example, to remove the write-protection from the file, you can run the following command:
chflags nouchg /path/to/file
This will remove the user immutable flag from the file, allowing it to be modified or deleted again.
By using the chflags command with the uchg and nouchg options, you can easily write-protect and remove write-protection from files on Apple OS X from the command line. This can be useful for preventing accidental changes to important files.