AWK basics

Printing columns Print all the columns: $ awk ‘{print $0}’ FILE Print the 1 column: $ awk ‘{print $1}’ FILE Print the last column: $ awk ‘{print $NF}’ FILE Print multiple columns: $ awk ‘{print $1 $3}’ FILE Specifying field separator By default, awk uses space and tab as field separator. You can specify how… Continue reading “AWK basics”

Flushing iptables

You can flush and reset iptables to default running these commands: iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT The -F command flushes all the chains and -X deletes empty (non-default)… Continue reading “Flushing iptables”