"at" command does not work propely in CentOS

[nlp7]

I have two scripts:

script1.sh

Code: Select all

sleep 10
echo 'res1' > res1.txt

script2.sh

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sleep 10
echo 'res2' > res2.txt

Then I run:

Code: Select all

$ echo 'sh script1.sh' | at now
$ echo 'sh script2.sh' | at now

Expected behaviour (works in Ubuntu):
wait 10s, print res1, wait 10s, print res2.

What I get in CentOS:
wait 10s, print both res1 and res2.


Is this a bug?

[TrevorH]

Why are you expecting it to wait another 10s after the first? If you waited 10s after you entered the first at command then the 2nd would run 10s later.

[nlp7]

The at commands are submitted within milliseconds. These are batch jobs that are coming from users. Each user submits a job to the queue, and the system should execute them one by one. Not all of them at the same time.


If I submit 1000 jobs now in Centos, it will spawn 1000 processes to run them now. This is not the purpose of a queue lol.

[TrevorH]

It's not a queue. You're telling it to run the command in 10s time and it does.