Operation and Maintenance
Linux Operation and Maintenance
How to get the MAC address of a network interface in Linux
How to get the MAC address of a network interface in Linux
使用ip link show eth0可查看MAC地址，推荐该命令获取接口信息，也可通过cat /sys/class/net/eth0/address直接读取，适用于脚本中快速获取。
To get the MAC address of a network interface in Linux, you can use several command-line tools. The most common and straightforward methods are using ip, ifconfig, or reading directly from the /sys/class/net/ filesystem.
Using the ip command (recommended)
The ip command is modern and preferred on most current Linux distributions.
ip link show [interface_name]For example, to view the MAC address of interface eth0:
ip link show eth0Look for the line containing ether — it will display the MAC address. Example output:
link/ether aa:bb:cc:dd:ee:ff brd ff:ff:ff:ff:ff:ffIf you want just the MAC address without extra text, use:
ip link show eth0 | grep -o -E '([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}'Using ifconfig
ifconfig is older and may not be installed by default on minimal systems, but still widely used.
ifconfig eth0In the output, look for HWaddr (on older systems) or ether. Example:
ether aa:bb:cc:dd:ee:ff txqueuelen 1000 (Ethernet)To extract only the MAC:
ifconfig eth0 | grep -o -E '([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}'Reading from /sys/class/net/
You can directly read the MAC address from the virtual filesystem:
cat /sys/class/net/eth0/addressThis method is fast and clean, especially useful in scripts.
List all interfaces and their MAC addresses
To see MAC addresses for all interfaces:
ip -o link show | grep -E '^[0-9] : [^:] ' | awk -F': ' '{print $2}' | xargs -I {} sh -c 'printf "%s\t" {}; ip link show {} | grep -o -E "([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}"'Or simpler:
for iface in /sys/class/net/*; do dev=$(basename $iface) mac=$(cat $iface/address 2>/dev/null || echo "N/A") printf "%-10s %s\n" "$dev" "$mac" doneBasically, ip link show is the best starting point. For scripting, accessing /sys/class/net/[interface]/address is reliable and lightweight.
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