#!/bin/bash

# this script outputs all ip's in a file or from stdout
# pretty handy sometimes. I especially needed something like this
# for some of my other scripts, so I didn't need to type the
# [0-9]{1,3}\.[	... thing a thousand times.

# Usage:
# $ ipgrep [-l]  `cat /path/to/file`
# or
# $ cat /path/to/file | ipgrep [-l]

# NOT
# $ ipgrep /path/to/file
# You need the cat-command in some way or another.

# the -l switch makes all the ip's stand one on each line in stead of all in one line

if [ "$1" = "" ] || ( [ "$1" = "-l" ] && [ "$2" = "" ] ) ; then
  line=`cat /dev/stdin`
else
  line="$@"
fi
ip=`echo "$line" | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'`

if [ "$1" = "-l" ] ; then
  for i in $ip ; do
    echo $i
  done
else
  echo $ip
fi