List only the device names of all available network interfaces

Another alternative would be:

ip -o link show | awk -F': ' '{print $2}'

Or maybe:

ls /sys/class/net

Just use /sys/class/net and strip out the path:

$ basename -a /sys/class/net/*
eth0
eth1
lo
ppp0
tun0

A more modern way would be to use the iproute json output and a parser, like:

$ ip -j link |jq -r '.[].ifname'
lo
wlp0s20f3
enp0s31f6
virbr0
virbr0-nic

Which allows you to filter out the loopback interface:

$ ip -j link |jq -r '.[].ifname | select(. != "lo")'
wlp0s20f3
enp0s31f6
virbr0
virbr0-nic

Give this a try:

ifconfig -a | sed 's/[ \t].*//;/^$/d'

This will omit lo:

ifconfig -a | sed 's/[ \t].*//;/^\(lo\|\)$/d'

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