AWK to extract IP address, Mac Address and Netmask

Scenario:
Use ifconfi and awk/gawk to extract network information.

For Linux:
Usage: ifconfig | awk -f linuxNICParser.awk

linuxNICParser.awk

BEGIN {
  FS = "\n"
}
{
      # nics[1,1]:nicName, [1,2]:macAddress, [1,3]:ipAddress, [1,4]:netMask
      newNicLine = "[A-Za-z].*encap.*"
      ipLine = ".*inet.*"
      zeroLine = $0
      isFirstSection = 1
      nicCount = 0
      newSec = match(zeroLine, newNicLine)
      if (newSec) {
        split (zeroLine, variableArray, " ")
        nicName = variableArray[1]
      # ignore loop nic
        if ( ! match(nicName, "lo*") ) {
          nicCount = nicCount + 1
          nics[nicCount,1] = nicName
          nics[nicCount,2] = variableArray[5]
        } else
          isFirstSection = 10
      }
      while (( getline variableLine ) > 0)
      {
        newSec = match(variableLine, newNicLine)
      if (newSec) {
        isFirstSection == 0
        split (variableLine, variableArray, " ")
        nicName = variableArray[1]
      # ignore loop nic
        if ( ! match(nicName, "lo*") ) {
          nicCount = nicCount + 1
          nics[nicCount,1] = nicName
          nics[nicCount,2] = variableArray[5]
        } else
          isFirstSection = 10
      }

      #ignore loop device
        if (isFirstSection == 10)
          continue

      # Get ip/net mask
      if (match(variableLine, ipLine)) {
        split (variableLine, variableArray, ":")
        split (variableArray[2], tmpArray, " ")
        nics[nicCount,3] = tmpArray[1]
        nics[nicCount,4] = variableArray[4]
      }
      }
}

END {
  for (i = 1; i <= nicCount; i++) {
    print width
    for (j =1; j<=4; j++) {
      print nics[i,j]
    }
  }
}

For Solaris:

Usage: ifconfig -a|gawk -f solarisNICParser.awk

solarisNICParser.awk

BEGIN {                                  
  FS = "\n"                              
}                                        
{                                        
      # nics[1,1]:nicName, [1,2]:macAddress, [1,3]:ipAddress, [1,4]:netMask
      newNicLine = "[A-Za-z].*flags.*"                                    
      ipLine = "inet*"                                                    
      macLine = "ether*"                                                  
      zeroLine = $0                                                       
      isFirstSection = 1                                                  
      nicCount = 0                                                        
      newSec = match(zeroLine, newNicLine)                                
      if (newSec) {                                                       
        split (zeroLine, variableArray, ":")                              
        nicName = variableArray[1]                                        
      # ignore loop nic                                                   
        if ( ! match(nicName, "lo*") ) {                                  
          nicCount = nicCount + 1                                         
          nics[nicCount,1] = nicName
        } else
          isFirstSection = 10
      }
      while (( getline variableLine ) > 0)
      {
        newSec = match(variableLine, newNicLine)
      if (newSec) {
        isFirstSection = 0
        split (variableLine, variableArray, " ")
        nicName = variableArray[1]
      # ignore loop nic
        if ( ! match(nicName, "lo*") ) {
          nicCount = nicCount + 1
          nics[nicCount,1] = nicName
        }
      }
      #ignore loop device
        if (isFirstSection == 10)
          continue

      # Get ip/net mask
      if (match(variableLine, ipLine)) {
        split (variableLine, variableArray, " ")
        nics[nicCount,3] = variableArray[2]
        nics[nicCount,4] = variableArray[6]
      }

      # Get mac address
      if (match(variableLine, macLine)) {
        split (variableLine, variableArray, " ")
        nics[nicCount,2] = variableArray[2]
      }
      }
}

END {
  for (i = 1; i <= nicCount; i++) {
    for (j =1; j<=4; j++) {
      print nics[i,j]
    }
  }
}