primeiro crie o banco de dados mysql: databasename
crie uma tabela mysql com 2 campos de texto para IP e MAC:
#!/bin/bash
sed 's/atPhysAddress\[10\]\[//g' arp.txt | sed 's/\]\ \"/\|/g' | sed 's/\ \"/\|/g'> /tmp/arp.new
mysql -uroot -ppassword databasename <<EOF
load data infile '/tmp/arp.new'
into table tablename
fields terminated by '|'
escaped by '\\'
lines terminated by '\n';
EOF