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|  | garbage for run/sexp's test | 
|  | ensure processes don't hang when they keep writing while the pipe buffer is full.  Instead, it would kill the process with sigpipe | 
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|  | Unfortunately, no test for it | 
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|  | the empty symbol) | 
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|  | fork/pipe+ chain | 
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|  | print-error-message to print the error message, then exit | 
|  | run processess synchronously |