This hasn't got anything to do with UNIX. A certificate is an authentication mechanism, like a key for a certain lock. If you are in posssession of the key you can open the lock, otherwise it stays locked.

This should be obvious enough: You tried to contact the given URL. The browser software tried to load a requested certificate from a file (with stored certificates) located in "~/Documents/Certificates.pem" This file is named "Certificates.pem" and located in your HOME directory (this is what "~" means), in a directory called "Documents". Alas, this files seems not to exist, the browser process has insufficient privileges to access it or something else prevents the process from poperly reading it.

A program might be installed but to call it without a path ("command" instead of "/path/to/command") the path it resides in has to be included in the variable PATH. Do the following:

1) find out where the executable "brew" is:

Code:

find / -type f -name "brew" -print

This will take several minutes because it searches all your mounted filesystems. There are better ways to find it, but they are more complicated to explain, this is the "brute-force method" but guaranteed to work.

2) you get eventually an output of "/some/path/to/brew". This path has to be included into your PATH variable. Do an:

Code:

echo $PATH

and you will see a list of such pathes, separated by colon characters, similar to this:

Code:

# echo $PATH
/usr/bin:/usr/local/bin:/etc:/sbin:/usr/sbin:/opt/freeware/bin

Now put the path you did find at the beginning of this environment variable:

Code:

# PATH="/some/path/to:$PATH"
# echo $PATH
/some/path/to:/usr/bin:/usr/local/bin:/etc:/sbin:/usr/sbin:/opt/freeware/bin

Now you can issue the command "brew" without having to specify the whole path to it. Note that this will last for only this session because the change to the PATH variable will not be permanent. For this you will have to edit your startup files ("~/.profile" or some rc-file, depending on the shell you use).

I hope this helps.

bakunin