jobber examples: basic usage

This example shows a typical use of jobber on a personnel computer:

A task_list must be prepared.
Processing of the list in a jobber queue must be init-ialized.
all tasks in the list are executed by running tasks in parallel on all cores available: --parallel=4 executes 4 tasks simultaneously, assuming a quad core processor. Timestamps show the parallel execution of 4 tasks each.

shell$ # create/generate task.list
shell$ cat task.list
sleep 1; echo '--task-1--'
sleep 1; echo '--task-2--'
sleep 1; echo '--task-3--'
sleep 1; echo '--task-4--'
sleep 1; echo '--task-5--'
sleep 1; echo '--task-6--'
sleep 1; echo '--task-7--'
sleep 1; echo '--task-8--'
sleep 1; echo '--task-9--'
sleep 1; echo '--task-10--'
shell$ jobber task.list init
[2022-04-06T12:34:12] appended 10 tasks
shell$ jobber --parallel=4 task.list all 
[2022-04-06T12:34:12] 1.1 task.worker: sleep 1; echo '--task-1--'
[2022-04-06T12:34:12] 2.2 task.worker: sleep 1; echo '--task-2--'
[2022-04-06T12:34:12] 3.3 task.worker: sleep 1; echo '--task-3--'
[2022-04-06T12:34:12] 4.4 task.worker: sleep 1; echo '--task-4--'
[2022-04-06T12:34:13] 1.1 exit status: 0
--task-1--
[2022-04-06T12:34:13] 5.5 task.worker: sleep 1; echo '--task-5--'
[2022-04-06T12:34:13] 2.2 exit status: 0
[2022-04-06T12:34:13] 3.3 exit status: 0
[2022-04-06T12:34:13] 4.4 exit status: 0
--task-2--
--task-3--
--task-4--
[2022-04-06T12:34:13] 6.6 task.worker: sleep 1; echo '--task-6--'
[2022-04-06T12:34:13] 7.7 task.worker: sleep 1; echo '--task-7--'
[2022-04-06T12:34:13] 8.8 task.worker: sleep 1; echo '--task-8--'
[2022-04-06T12:34:14] 5.5 exit status: 0
--task-5--
[2022-04-06T12:34:14] 9.9 task.worker: sleep 1; echo '--task-9--'
[2022-04-06T12:34:14] 6.6 exit status: 0
--task-6--
[2022-04-06T12:34:14] 10.10 task.worker: sleep 1; echo '--task-10--'
[2022-04-06T12:34:14] 7.7 exit status: 0
[2022-04-06T12:34:14] 8.8 exit status: 0
--task-7--
--task-8--
[2022-04-06T12:34:15] 9.9 exit status: 0
--task-9--
[2022-04-06T12:34:15] 10.10 exit status: 0
--task-10--
shell$