Re: GNU Parallel Bug Reports problem running most basic sem command

[Andreas Bernauer]

On 29/09/15 20:53, Ghinwa Choueiter wrote:
> I am running on an imac:
> ProductName:Mac OS X
> ProductVersion:10.10.5
> 
> and parallel --version gives
> 
> GNU parallel 20150822
> 
> I am unable to run sem. Just the sem command with nothing else gives me:
> parallel: Warning: Semaphore stuck for 30 seconds. Consider using
> --semaphoretimeout.

Can you post the command you are trying to run?

In any case, with the same version of parallel,
the example from the man page

$ cat myfile
a
$ seq 3 | parallel sem sed -i -e 'i{}' myfile

did not run on my Mac, at first. It just blocked.

Then I deleted the empty directory ~/.parallel/semaphores.

After that, the command run, but had no effect on myfile. I think the
sed syntax is wrong for Mac:

$ sed -i -e 'i3' myfile
sed: 1: "i3": command i expects \ followed by text

But running

$ seq 3 | parallel sem 'echo {} >> myfile'

worked:

$ cat myfile
a
1
2
3


-Andreas