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Error using timeout command - invalid time interval

user4855
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user4855 Published in September 21, 2018, 8:03 am

I want to kill a command after waiting for result for 2 seconds. If the command didn't come up with a result (took too long), the command should stop. I have gone through the documents and tested the following command:

timeout --kill-after=2 ls /mnt/ftp/;
echo $?;

Or

timeout -k 2 ls /mnt/ftp/;
echo $?;

However, I am getting this error:

timeout: invalid time interval ‘ls’

Note: The command below stops after timeout period by doesn't kill the process:

timeout 2 ls /mnt/ftp/;
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