nmap versions lower than 5.30BETA1: nmap -sP 192.168.1.* newer nmap versions: nmap -sn 192.168.1.* This gives me hostnames along with IP adresses, and only pings the hosts to discover them. This will only give you the hostnames if you run it as root. EDIT: As of Nmap 5.30BETA1 [2010-03-29] -sP has been replaced with -sn … Read more
find /tmp -name something | grep . The return status will be 0 when something is found, and non-zero otherwise. EDIT: Changed from egrep ‘.*’ to the much simpler grep ., since the result is the same.
There’s some inconsistency between SSL implementations on how they match wildcards, however you’ll need the root as an alternate name for that to work with most clients. For a *.example.com cert, a.example.com should pass www.example.com should pass example.com should not pass a.b.example.com may pass depending on implementation (but probably not). Essentially, the standards say that … Read more
You can add following section to your inventory file: [all:vars] ansible_connection=ssh ansible_user=vagrant ansible_ssh_pass=vagrant Note: Before Ansible 2.0 ansible_user was ansible_ssh_user.
Use the On-Screen Keyboard (osk.exe). You can press Ctrl-Alt-Del virtually! (Note: you may need to hold the CTRL and ALT keys on your physical keyboard (Windows Server 2012-R2))
IPTables isn’t made for this kind of work, where lots and lots of packets need to be analyzed to make these decisions. IPTables is partly the answer though! The real answer to this is the awesome and underused traffic control facilities in Linux. Note that mucking around with this without knowing what is going on … Read more
You could try Ctrl–a : source ~/.screenrc.
Well, let’s work this out; 2 x 24 port switches (say Cisco 3750-E’s) can output 344 BTU/hr each so that’s 688 in total 1 x router (say a Cisco 2921) can output 1260 BTU/hr 1 x VDSL modem (say a Draytek Vigor 2750) can output 120 BTU/hr 1 x Desktop (say a Dell Optiplex 790, … Read more
palmer’s GUI information is correct, but there is a more maintainable way to modify the path seen by the shell. Like mediaslave said, you can edit /etc/paths, but even better you can drop a text file in /etc/paths.d/ that has a path in it and all shells will construct the path correctly. For example, on … Read more
The best way to tell if any given remote service is alive is to ask it to service a request in the way it’s meant to – in fact it’s the only way to truly know something is working correctly. As an example I always get my load-balancers to get an actual ‘head’ response back … Read more