regex - use grep/sed/awk to extract string corresponding to certain field -
on fedora system, following: $ cat /proc/net/arp ip address hw type flags hw address mask device 130.48.0.1 0x1 0x2 80:4b:c7:10:3e:41 * wlp1s0 how can pipe result of device (in case answer wlp1s0) using screen editor such sed or grep or awk? thanks! $ awk '/^[0-9]/{print $6}' /proc/net/arp wlp1s0 /^[0-9]/ selects lines start digit, ip print $6 prints 6th colum being device