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#!/bin/bash

counter=101

testip=`seq 101 120`

for freeip in $testip

do

echo "counter is $((counter++))"

dunno=`grep 172.168.56.$counter test`

echo "$dunno is dunno"

if [[ -z $dunno ]] ; then

echo "tested $counter as free"

exit 0

fi

done

# for i loop with two files, line by line

loop=`cat file1 |wc -l` ; echo $loop ; for i in `seq 1 $loop` ; do echo `awk "NR==$i" file1` and `awk "NR==$i" file2` ; done