Task1. Review the shell0.c program. Compile and run it. This is a simple shell in loop to get input string (command) to be executed. Use shell0.c program as a base code for the following tasks. ** Review again: APUE3.12 dup/dup2, APUE8.3 fork & 8.10 exec, APUE9.9 Shell, APUE15.2 pipe.

Precipitation hardening can be achieved in many light alloys by a three-step heat treatment. what is carried out and what is the purpose at each step? why is such a treatment necessary based on the nucleation and growth theory of phase transformation. compare this treatment with tempering martensite for carbon steels (similarities and differences).