Commands tagged IP

Reciprocally, we could get the node name from a give Tor IP address =>

ip2node() { curl -s -d "QueryIP=$1" http://torstatus.blutmagie.de/tor_exit_query.php | grep -oP "Server name:.*'>\K\w+" ; }

ip2node 204.8.156.142

BostonUCompSci

export THISOS="`uname -s`"

if [ "$THISOS" = "SunOS" ]

then

export THISRELEASE="`uname -r`"

ping1() { ping -s $1 56 1 | egrep "^64"; }

elif [ "$THISOS" = "AIX" ]

then

export THISRELEASE="`uname -v`.`uname -r`"

ping1() { ping -w ${2:-1} $1 56 1 | egrep "^64"; }

elif [ "$THISOS" = "Linux" ]

then

export THISRELEASE="`uname -r`"

ping1() { ping -c 1 -w ${2:-1} $1 | egrep "^64"; }

fi

I have used single packet, and in a silent mode with no display of ping stats. This is with color and UI improvement to the http://www.commandlinefu.com/commands/view/10220/check-if-a-machine-is-online. It is as per the enhancements suggested.

PING

parameters

c 1 limits to 1 pinging attempt

q makes the command quiet (or silent mode)

/dev/null 2>&1 is to remove the display

&& echo ONLINE is executed if previous command is successful (return value 0)

|| echo OFFLINE is executed otherwise (return value of 1 if unreachable or 2 if you're offline yourself).

I personally use this command as an alias with a predefined machine name but there are at least 2 improvements that may be done.

Asking for the machine name or IP

Escaping the output so that it displays ONLINE in green and OFFLINE in red (for instance).

Converts IP octets to hex using printf command. Useful for generating pxeboot aliases in the pxelinux.cfg folder.

Grabs your external public IP.

Provides a cleaner output plus some more details about the IP address. Also, a flaw was corrected where the URL provided the results in Spanish by default.

has the benefit of being a bit more cross-platform.

Get just the IP address for a given hostname. For best results, make this a function in your shell rc file so that it can be used for things like traceroute:

Titus:~$ traceroute `getip foo.com`

traceroute to 64.94.125.138 (64.94.125.138), 64 hops max, 52 byte packets

Find your default gateway and print it directly output.

http://www.bayner.com/

kerim@bayner.com

Find your default gateway and print it directly output

http://www.bilgisayarmatematik.com/

kerim@bayner.com

Interfaces like lo can be omitted from the beginning, there are probably better ways of doing this, i'm a noob at awk.

The +short option should make dig less chatty.

I'm just a simple programmer. I find dig too verbose. host tells me alias(es) and IP address in a quick to grok format with nothing special to remember for input parameters.

With thanks to http://www.cyberciti.biz/faq/how-to-test-or-check-reverse-dns/

If used without arguments, returns own IP info.

If used with argument, returns info about the parsed argument.