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Getting the IP address in unix server

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Top Forums Shell Programming and Scripting Getting the IP address in unix server
# 8  
Old 07-03-2008
Quote:
Originally Posted by Balamani
I am able to get the IP of my server from command prompt, but when i put the same in my script its give the output has hostname.


#!/usr/bin/bash
SERVER_IP=`grep -w `hostname` /etc/hosts | awk '{print $1}'`
echo $SEREVR_IP

Why ?
You can't nest backquotes (the shell has no way of knowing which ones are inside others, i.e. it sees `grep -w ` as one set, and ` /etc/hosts | awk '{print $1}'` as another set. That's why it's safer to use the $( command ) syntax:

Code:
#!/usr/bin/bash
SERVER_IP=$(grep -w $(hostname) /etc/hosts | awk '{print $1}')
echo $SEREVR_IP

Quote:
Originally Posted by majormark
var1=`netstat -in | grep bge0 | awk '{ print $4 }'`
No need for grep and awk:

Code:
var1=`netstat -in | awk '/bge0/ { print $4 }'`
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