CS208 Introduction to Computer Systems
Wednesday, 15 Feb 2023

+ Questions
- '\0' has type char
  NULL has type void*

+ Debugging C programs
- VS Code
- gdb

+ Memory management in the shell
- argv
    char *argv[]
    argv[0] --> "ls\0"
    argv[1] --> "-l\0"
    argv[2] == NULL
- Set up argv
    get user input "ls -l"
    count argc (==2)
    allocate argv
        char *argv[argc+1]
    insert \0's  "ls\0-l\0"
    point argv[k] to appropriate places

+ Redirection
- File descriptors
- dup2
- pipe