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An execlp1 request runs a program p with one argument a in directory d and waits for the program to exit:

The reply has form

where p is a one element list containing one one-byte string. The byte is the return value of the program.
The 1 in execlp1 refers to the number of arguments. The execlp1 request is implemented by the execlp() unix call. The search path is used to locate the command.
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