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I have been reading about using 'at' to schedule tasks from the command line based on start time here.

If I don't know how long tasks will take to complete, what is the best way to schedule consecutive tasks? In this case, I want to run several Torch7 scripts consecutively.

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AFAIK you can enter multiple commands in a single at job, and they will be executed sequentially in the order in which you entered them - for example, using sleep to simulate an extended command:

$ at now +1 minute
warning: commands will be executed using /bin/sh
at> logger ": starting first job"; sleep 1m
at> logger ": starting second job"; sleep 1m
at> logger ": staring third job"
at> <EOT>
job 2 at Thu Aug 18 07:58:00 2016

results in

$ tail -f /var/log/syslog
Aug 18 07:58:26 xenial-vm steeldriver: : starting first job
Aug 18 07:59:26 xenial-vm steeldriver: : starting second job
Aug 18 08:00:26 xenial-vm steeldriver: : staring third job

Alternatively, you could create a wrapper script for your commands and schedule that in at

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