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Run Second Command If the First Fails
How to run two commands with a condition that the second one will run only if the first one fails?
✍: FYIcenter.com
You can run two commands with a condition that the second one will run only if the first one fails with the syntax below:
command-1 || command-2
For example, if you want to write a message to the screen only after the "ping" command fails to reach a remote server, you can use the following command line:
ping host-name || echo Server not reachable
If you try this with google.com, the message will not be displayed:
C:\fyicenter>ping google.com || echo Server not reachable Pinging google.com [172.217.10.78] with 32 bytes of data: Reply from 172.217.10.78: bytes=32 time=23ms TTL=56 Reply from 172.217.10.78: bytes=32 time=23ms TTL=56 Reply from 172.217.10.78: bytes=32 time=30ms TTL=56 Reply from 172.217.10.78: bytes=32 time=29ms TTL=56 Ping statistics for 172.217.10.78: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 23ms, Maximum = 30ms, Average = 26ms
If you try this with a server that is not reachable, the message will be displayed:
C:\fyicenter>ping junk.com || echo Server not reachable Pinging junk.com [23.23.86.44] with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 23.23.86.44: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), Server not reachable
2022-08-26, 1440🔥, 0💬
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