What happens when you execute ls -l?

• Shell reads the input using getline() which reads the input file stream and stores into a buffer as a string

• The buffer is broken down into tokens and stored in an array this way: {"ls", "-l", "NULL"}

• Shell checks if an expansion is required (in case of ls *.c)

• Once the program in memory, its execution starts. First by calling readdir()

Notes:

• getline() originates in GNU C library and used to read lines from input stream and stores those lines in the buffer