/programs_and_shell_scripts

Primary LanguageC


Some PID and PPID Programs & scripts 🌱

  • program that prints the PID of the parent process
  • shell script that prints the maximum value a process ID can be. *program that prints all the arguments, without using ac Some programs & scripts in C
  • program that prints "$ ", wait for the user to enter a command, prints it on the next line.
  • function that splits a string and returns an array of each word of the string
  • Write the function without strtok
  • program that executes the command ls -l /tmp in 5 different child processes. Each child should be created by the same process (the father). Wait for a child to exit before creating a new child.
  • program that looks for files in the current PATH.

    • Exercises

    1. printenv with environ Write a program that prints the environment using the global variable environ.

    2. env vs environ Write a program that prints the address of env (the third parameter of the main function) and environ (the global variable). Are they they same? Does this make sense?

    3. getenv() Write a function that gets an environment variable. (without using getenv)

    Prototype: char *_getenv(const char *name); man 3 getenv

    1. PATH Write a function that prints each directory contained in the the environment variable PATH, one directory per line.

    2. PATH Write a function that builds a linked list of the PATH directories.

    3. setenv Write a function that changes or adds an environment variable (without using setenv).

    Prototype: int _setenv(const char *name, const char *value, int overwrite); man 3 setenv

    1. unsetenv Write a function that deletes the variable name from the environment (without using unsetenv).

    Prototype: int _unsetenv(const char *name); man 3 unsetenv