Check These Out
alternative to
$curl ifconfig.me
for those that don't have curl
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
Use tput cols to find the width of the terminal and set it as the minimum field width.
Fdiff will run the command given by the first argument against the input files given as the second and third arguments, and diff the results.
It will use 'diff' as the default diff program, but this can be changed by setting $DIFFCMD, e.g.
$ export DIFFCMD=vimdiff;
$ fdiff zcat 0716_0020005.raw.gz 0716_0030005.raw.gz
...
This function will work under bash, but requires the use of command substitution, which is not available under a strict ANSI shell.
Google text-to-speech in your local language or in language of choice via country code switch (ISO 639-1).
An old USB A/B cable is all you need to make your own Smart Home hardware!
Cut off and discard the B-portion of the USB cable. On the A side, connect the RED (+) and WHITE (D-) wires via a 1 kiloohm resistor.
$Picture:
http://imgur.com/dJGVlAU
Now plug the cable into a USB port on your Linux computer. Your hardware is ready!
Run the above command after changing variable mysms to your personal email-to-SMS gateway info as required by your cellular service provider.
The command uses the amazing usbmon tool (see link below) to detect the cable.
For the curious, to view the raw usbmon output, run this command: (Also see the sample output)
$usbmon -i usb0
How does it work? When the red and white wires are connected (via the 1 kiloohm resistor) the USB hardwere is tricked into thinking that a new USB device is trying to start up.
We then use the usbmon utility to capture the host USB events as it tries to talk to the cable.
The expect utility watches the usbmon stream and waits for the disconnect text "-2:128" before sending the SMS message.
Finally, the sendmail tool is used to email the SMS message to your smartphone via your cellular provider's SMS-to-email gateway.
As a result, when the electrical connection between the red and white wire is interrupted, or the USB cable is unplugged from your computer, you get an SMS notification of the disconnect event on your smartphone.
Could this be the cheapest smart home gadget ever? What are YOU going to sense with it?
Please let me know in the comments and please don't forget to click it up!
$
$Links:
$
http://www.linuxcertif.com/man/8/usbmon/
http://en.wikipedia.org/wiki/USB#Pinouts
http://imgur.com/dJGVlAU
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token.
This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use:
`awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'`
You must adapt the command line to include:
* $MFA_IDis ARN of the virtual MFA or serial number of the physical one
* TTL for the credentials
Converts any number of seconds into days, hours, minutes and seconds.
sec2dhms() {
declare -i SS="$1"
D=$(( SS / 86400 ))
H=$(( SS % 86400 / 3600 ))
M=$(( SS % 3600 / 60 ))
S=$(( SS % 60 ))
[ "$D" -gt 0 ] && echo -n "${D}:"
[ "$H" -gt 0 ] && printf "%02g:" "$H"
printf "%02g:%02g\n" "$M" "$S"
}
