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CS 241 Section Week #4

CS 241 Section Week #4. 02/16/12. Topics This Section. MP3 overview printf () / fgets () , getline () example fork() / exec() / wait() example s trtok (), chdir () example. MP3. Simple Unix shell Built-in commands Change directory Termination History Non built-in commands

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CS 241 Section Week #4

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  1. CS 241Section Week #4 02/16/12

  2. Topics This Section • MP3 overview • printf() / fgets(), getline() example • fork() / exec() / wait() example • strtok(), chdir() example

  3. MP3 • Simple Unix shell • Built-in commands • Change directory • Termination • History • Non built-in commands • Error handling • Concepts: process, fork, exec, wait

  4. Read the command from stdin • Let’s look at 1.c

  5. Running Non Built-in Commands • Requires a new process to run the binary • Why? • fork() creates a new process • exec() runs executable • wait () makes the parent wait for the child to finish • Instead of using system() , we use fork + exec + wait

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