You want to write a script that checks if the interface eth1 has an IP address assigned using ip addr. Which command snippet correctly tests this?
hard📝 Application Q15 of 15
Linux CLI - Networking Commands
You want to write a script that checks if the interface eth1 has an IP address assigned using ip addr. Which command snippet correctly tests this?
Aifconfig eth1 | grep -q 'inet6 '; then echo 'IP assigned'; else echo 'No IP'; fi
Bif ip addr show eth1 | grep -q 'inet '; then echo 'IP assigned'; else echo 'No IP'; fi
Cip addr show eth1 | grep -q 'ether '; then echo 'IP assigned'; else echo 'No IP'; fi
Dif ip link show eth1 | grep -q 'UP'; then echo 'IP assigned'; else echo 'No IP'; fi
Step-by-Step Solution
Solution:
Step 1: Identify correct IP address check
The command ip addr show eth1 lists addresses; searching for 'inet ' finds IPv4 addresses assigned.
Step 2: Evaluate other options
ifconfig eth1 | grep -q 'inet6 '; then echo 'IP assigned'; else echo 'No IP'; fi checks IPv6 with ifconfig but question asks for ip addr. ip addr show eth1 | grep -q 'ether '; then echo 'IP assigned'; else echo 'No IP'; fi looks for MAC address ('ether'), not IP. if ip link show eth1 | grep -q 'UP'; then echo 'IP assigned'; else echo 'No IP'; fi checks interface status, not IP assignment.
Final Answer:
if ip addr show eth1 | grep -q 'inet '; then echo 'IP assigned'; else echo 'No IP'; fi -> Option B
Quick Check:
Check 'inet ' in ip addr output = A [OK]
Quick Trick:Search 'inet ' in ip addr output to find IPv4 address [OK]
Common Mistakes:
Checking MAC address instead of IP
Using ip link instead of ip addr
Confusing IPv6 with IPv4 check
Master "Networking Commands" in Linux CLI
9 interactive learning modes - each teaches the same concept differently
