?Cat and grep? You can use only grep ("grep \. filename"). Better option is awk.

Pipe any output to "grep ." and blank lines will not be printed.

Easy and direct way to find this out.

Using DynDNS or a similar service not only allows access to your home machine from outside without needing to know what IP the ISP has assigned to it but it also comes in handy if you want to know your external IP address. The only purpose of the sed command is to remove the leading "host.na.me has address " part from the output. If you don't need to discard it you can simply use

On Ubuntu, if tzwatch is installed, then you can call up in terminal the output for every time zone configured in gWorldClock.

On Ubuntu, if tzwatch is installed, then you can call up in terminal the output for every time zone configured in gWorldClock.

prints out the time for the timezone specified in $offsetutc. So you have less to think about things like: "I'm in utc+4 and my friend in utc-7, can I call him now or will I wake him?"

Note: $offsetutc should be an integer between -12 and 12.

sends commands specified in $commandfile to the telnet-server specified by $telnetserver.

to have newlines in $commandfile interpreted as ENTER, save the file in CR+LF (aka "Windows-Textfile") format.

if you want to save the output in a separate file, use:

extracts the debian-package $debfile to $extractdir, including all packaging-information. to repack the package, just type:

I use this in a script on my openwrt router to check if my DynDNS needs to be updated, saves your account from being banned for blank updates.

Same as original just no $ at start

Strips the non-ip information from the dig output. Could be combined with "head -1" to ensure a single ip is returned. Useful for outputting as a variable for use in scripts.

A similar command that lists only the currently running VMs is thus:

...the above showing a list of VMs by name and UUID in the same format as the "$ VBoxManage list vms" command

you can launch a VirtualBox VM from the command line using VBoxManage, but that invokes it in a gui environment.

If you want to just fire off your VM in the background, use VBoxHeadless as shown. To get the names and UUIDs of your VirtualBox VMs, type:

Gets the internal and external IP addresses of all your interfaces, or the ones given as arguments

Generates password consisting of alphanumeric characters, defaults to 16 characters unless argument given.

-n 9000 : Number of requests to perform for the benchmarking session

-c 900 : Number of multiple requests to perform at a time

Uses the last argument of the last executed command, and gets the directory name from it.

Use $!:t for the filename alone, without the dirname.