IPアドレス取得

addr.sh

#!/bin/sh

IP_ADDR1=`LANG=C /sbin/ifconfig \
  | grep '^\s*inet addr'        \
  | grep -v '\b127\.0\.0\.1\b'  \
  | head -1                     \
  | awk '{print $2}'            \
  | cut -d: -f2`

echo "[$IP_ADDR1]"

#-------------------------------------

IP_ADDR2=`LANG=C /sbin/ifconfig \
  | grep '^\s*inet addr'        \
  | grep -v '\b127\.0\.0\.1\b'  \
  | head -1                     \
  | perl -pe 's/^\s*inet addr\D*((?:\d+?\.){3}\d+?)\b.*$/$1/'`

echo "[$IP_ADDR2]"

#-------------------------------------

IP_ADDR3=`LANG=C /sbin/ifconfig  \
  | perl -ne 'print "$1\n" if /^\s*inet addr\D*((?:\d+\.){3}\d+)/' \
  | grep -v '^127\.0\.0\.1$'   \
  | head -1`

echo "[$IP_ADDR3]"

#-------------------------------------

get_ip_addr ()
{
  LANG=C /sbin/ifconfig  \
      | perl -ne 'print "$1\n" if /^\s*inet addr\D*((?:\d+\.){3}\d+)/'
}

IP_ADDR4=`get_ip_addr | grep -v '^127\.0\.0\.1$' | head -1`

echo "[$IP_ADDR4]"