First when we talk about operating system we mean the management of computer hardware and software resources and providing common services for computer programs.
Python has the power to easily manipulate the system calls, Operating environment, Processes, Timers, Signal handling, Error reporting etc…
Let’s start by the Environment Variables:
user = os.environ[’USER’]
os.environ[’PATH’] = "/bin:/usr/bin"
Working directory
| os.chdir(path) | # Change current working directory |
| os.getcwd() | # Get it |
Users and groups
| os.getegid() | # Get effective group id |
| os.geteuid() | # Get effective user id |
| os.getgid() | # Get group id |
| os.getuid() | # Get user id |
| os.setgid(gid) | # Set group id |
| os.setuid(uid) | # Set user id |
Process
| os.fork() | # Create a child process |
| os.execv(path,args) | # Execute a process os.execve(path, args, env) |
| os.execvp(path, args) | # Execute process, use default path os.execvpe(path,args, env) |
| os.wait([pid)] | # Wait for child process |
| os.waitpid(pid,options) | # Wait for change in state of child |
| os.system(command) | # Execute a system command |
| os._exit(n) | # Exit immediately with status n |