Are you sure that the secondary process is actually starting? Because the command you've posted uses Windows quoting not *nix shell quoting: 

perl -le"$|=1; print and select(undef,undef,undef,0.1) for 1 .. 1000" 
........^..........................................................^

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In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Tk and IPC - killing of process not working in Linux by BrowserUk
in thread Tk and IPC - killing of process not working in Linux by Dirk80

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