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Message: [QUOTE="Joel VanderWerf, post: 4474048"] Is this really true? irb(main):019:0> puts `pstree -a #{$$}` irb ... â””â”€pstree -a 8921 => nil irb(main):020:0> Thread.new {system "/usr/local/bin/ruby", "-e", "puts %{foo}; sleep 10"} => #<Thread:0xb7d64988 sleep> irb(main):021:0> foo irb(main):022:0* puts `pstree -a #{$$}` irb ... â”œâ”€pstree -a 8921 â””â”€ruby -e puts\040%{foo};\040sleep\04010 => nil This is linux, too. I don't see any sh invocation. It's not hidden by pstree is it? [/QUOTE]