Hardware Reference
In-Depth Information
Each command has its own pros and cons;
find
is really handy and powerful but
requires a lot of options that you need to know; on the other hand,
locate
is easy,
and simple but requires being updated regularly.
All you need to know about open
network ports
As long as you aim at using BeagleBone Black for server purposes, many ports are
going to be used. You will soon need to know those that are already assigned. For
example, ports 8080 and 8000 are very often required so they will be most probably
defined in many default configuration files when you install an application. Then, to
avoid port conflicts, you will want to retrieve those that are currently used. For this,
enter the following command:
debian@arm:~$ sudo netstat -an | grep LISTEN | grep -v ^unix
tcp 0 0 0.0.0.0:1984 0.0.0.0:*
LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:*
LISTEN
tcp 0 0 127.0.0.1:11211 0.0.0.0:*
LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:*
LISTEN
tcp6 0 0 :::6600 :::*
LISTEN
tcp6 0 0 :::80 :::*
LISTEN
tcp6 0 0 :::22 :::*
LISTEN
In the beginning of this appendix, we have seen how to ease our life with aliases
and functions.
I strongly suggest that you use the same technique with this long command.
Thereafter, you won't hesitate any more to use it because you won't need to
remember the whole syntax.
