system management -shell programming by gaurav raikar
- 1. SHELL PROGRAMMING System Management By Gaurav. M. Raikar EL-18-12
- 2. • A shell program or script is a computer program designed to be run by the Unix shell, a command-line interpreter. • The various dialects of shell scripts are considered to be scripting languages. • Typical operations performed by shell scripts include file manipulation, program execution, and printing text Shell Programming
- 4. Hardware layer Hardware layer consists of all peripheral devices (RAM/ HDD/ CPU etc.) Kernel • It is the core component of Operating System. • It interacts directly with the underlying hardware and provides low level services to upper layer components. • It manages the resources of Linux such as file management, multitasking, memory & I/O management Shell • Shell is an interface between a user and the kernel, hiding complexity of kernel's functions from users. • The shell takes commands from the user and executes kernel's functions. • shell gets started when the user logs in or start the terminal. Utilities • Utility programs that provide the user most of the functionalities of an operating systems.
- 5. Vmware & Fedora OS • VMware Workstation is a hosted hypervisor that runs on x64 versions of Windows and Linux operating systems; it enables users to set up virtual machines on a single physical machine • Fedora is an open-source operating system built over the Linux OS kernel architecture. Fedora is a free to use, customize and distribute. The operating system is integrated with packaged software and applications to provide enhanced abilities and functions. Python • Python is a high level language like C++, java. • It is easier to program in python as it is easy to learn and use, it takes less time to write, programs are shorter and easier to read.
- 6. System Administration • The job of a system administrator is to manage the operations of a handling files and directories of computer system. • An Operating System is designed consisting of system software meant for different purpose. • Each process is monitored by the process to know if it is working properly or not.
- 7. Session Management • Its a process of keeping track of activity across sessions of interactions with the computer system. • Typically sessions management include keeping track of applications open and thread handled. • A desktop is a program that saves contents and keep it for further use.
- 9. System Related Commands Who: shows who is logged in Who am I :Shows the name of current user logged in who -b: Shows the user list Date : Shows the current date and time ps -ef : Gives the full information of each running process Up-time : Tells how long it has been since the system has been powered ON. Last : shows Session In. Last User : Shows Information Of Login session Of Last User Free : Shows the free ,used memory on system
- 10. import os import sys import time print "who am i" print os.system('who am i') print os.system('uname -airvms') print "todays date and time" print os.system ('date') print "who has logged in the system" print os.system('who -b') print os.system('w') print "full information about each of the process currently running" print os.system('ps -ef') print "user oriented information" print os.system('ps -u') print "list information about files" print os.system('ls -ls') print "memory usage chart" print os.system('free') print " memory usage chart in human readable format " print os.system('free -h') print "see how long the system has been power up" print os.system('uptime') print "uptime in pretty format" print os.system('uptime -p') print "information about last logged in session" print os.system('last -f/var/log/wtmp') print "get information of the session only of the user " print os.system('last user ') print "information of the session with full user name and domain name " print os.system('last -w') print "get information of the session with the full user name and information about last session" print os.system('last reboot') Program
- 11. Output