For some specific topics, more related to scripting, has a few nice tutorials (they also stick to the basic Unix versions, without GNU extensions, which might be handy if you are writing scripts that is to run on non-Linux systems)
For some specific topics, more related to scripting, has a few nice tutorials (they also stick to the basic Unix versions, without GNU extensions, which might be handy if you are writing scripts that is to run on non-Linux systems)