Elaiya Iswera Lallan - Living with Linux in the Industrial World

About the Author Mr Elaiya Iswera Lallan has been in the IT Industry for the past 12 years.He is Managing Director of Blue Micro Solutions ,which is based in SIRIM Bhd(Governmnet agency) . Mr Lallan has extensive experience in the IT industry.He has recieved an award as a Federal Territory Entrepreneur.After obtaining his Bachelor Degree in Computers and Electronics Engineering from Kolej Bandar Utama (twinning program with University of Nottingham) year 2001,he joined the company called MIR as a Information Technology Consultant . He was performing computer programming tasks,and then joined as a software engineer in a new company called Neural Manufacturing Sdn Bhd.He had his best of experiences here when he was creating software technologies for the companys flagship product called e-Jari,which is a biometric security device.He created an enterprise time attendance system for this device that can be used by other companies ranging from SMEs to government offices. Some of the companies using this time attendance system are PejabatTanah & Galian in Kuala Lumpur, Koperasi Malaysia, Bernama and ITIS. He also created a Guard Patrol and Intruder Detection System using the e-Jari, and was involved in the ISO9000:2001certification for the company.With his extensive working experience and good track record of able to handle mega IT projects in government sector, Mr Lallan managed to join the incubatorship program under SIRIM Bhd in February 2010. With this Mr Lallan moved Blue Micro Solutions operations into the SIRIM building.

He obtained certification from Ministry of Finance in Malaysia in the software fields where he can participate in tenders for government IT projects. He also started employing staffs to do IT projects and ventured into IT trainings in private corporations, government institutions and polytechnics, such as SKALI Bhd, Kolej Komuniti in Klang, Politeknik Ungku Omar in Ipoh and Politeknik Kuching in Sarawak. He has made Blue Micro Solutions to be a certified Human Resource Development Funds (HRDF) training provider to companies in Malaysia. With his proven track record in both the industrial and education worlds in IT, Mr Lallan has been awarded collaboration with Open University Malaysia (OUM) to offer affordable IT degree program to the public recently. Currently Mr Lallan is pursuing MSC status for his company Blue Micro Solutions. With his company Blue Micro Solutions growing in the right directions, Mr Lallan began to explore his opportunities to grow his business in overseas as well.

Venturing into Canada, he successfully opened a branch called Blue Micro Canada Incorporated. He also successfully registered the company with the Canadian government in Toronto, whereby he received invitations to participate in the government tenders for IT projects. He also saw the opportunity to conduct IT trainings over the internet through webinars. He obtained license from Adobe USA to use its tool Adobe Connect to conduct webinars in Canada and United States of America. Foreword This book is an introduction to writing Linux shell scripts and installation of certain important tools for industry usage. Topics included are the use of commands and shortcuts in shell scripting, monitoring of memory and CPU usages, SSL implementation, packet tracing and webservers in linux environment.

This book was written based on real life industrial experience and practical usage. Plus before this book was produced a several advance linux trainings have been conducted by our experience linux practitioners to several organizations. Chapter 1: Linux Basic Commands The following commands are for new users or for beginners only. The purpose is you will become more familiar with your shell scripting and secondly, you need some of these command in your Shell script. $ date --help To see help or options related with ls command (Here you will screen by screen help, since help of ls command is quite big that can't fit on single screen ) $ ls --help | more Syntax: command-name --help Syntax: man command-name Syntax: info command-name See what happened when you type following $ man ls $ info bash Linux Commands List ls list files and directories ls -a list all files and directories mkdir make a directory cd directory change to named directory cd change to home-directory cd ~ change to home-directory cd .. change to parent directory pwd display the path of the current directory cp file1 file2 copy file1 and call it file2 mv file1 file2 move or rename file1 to file2 rm file remove a file rmdir directory remove a directory cat file display a file less file display a file a page at a time head file display the first few lines of a file tail file display the last few lines of a file grep 'keyword' file search a file for keywords wc file count number of lines/words/characters in file command > file redirect standard output to a file command >> file append standard output to a file command < file redirect standard input from a file command1 | command2 pipe the output of command1 to the input of command2 cat file1 file2 > file0 concatenate file1 and file2 to file0 sort sort data who list users currently logged in HTOP Tool This is htop, an interactive process viewer for Linux.

It is a text-mode application (for console or X terminals) and requires ncurses. Comparison between htop and top

• In 'htop' you can scroll the list vertically and horizontally to see all processes and complete command lines.
• In 'top' you are subject to a delay for each

unassigned key you press (especially annoying when multi-key escape sequences are triggered by accident). 'htop' starts faster ('top' seems to collect data for a while before displaying anything). In 'htop' you don't need to type the process number to kill a process, in 'top' you do. In 'htop' you don't need to type the process number or the priority value to renice a process, in 'top' you do. 'htop' supports mouse operation, 'top' doesn't 'top' is older, hence, more used and tested.

You can interact with the htop using mouse. You can scroll vertically to view the full process list, and scroll horizontally to view the full command line of the process. Installation command for HTOP tool: wget http://packages.sw.be/rpmforge-release/rpmforge- release-0.5.2-2.el5.rf.i386.rpm rpm -Uhv rpmforge-release*.rf.i386.rpm Chapter 2: Shell Scripting Normally shells are interactive. It means shell accept command from user and execute them. But if user uses command one by one, then user can store this sequence of command to text file and tell the shell to execute this text file instead of entering the commands. 1. 1.

Writing scripts and executing them 2. Basic commands 3. Shortcuts Understanding Linux Kernel Kernel is the main heart of Linux O/S. It handles resources of Linux O/S. The resources means are facilities available in Linux. For eg.

Facility to store data, print data on printer, memory, file management etc . Kernel allocates who will use this resource, for how long and when. It executes your programs and it's memory resident portion of Linux. It performance the following task:- 1) I/O management 2) Process management 3) Device management 4) File management 5) Memory management Understanding Linux Shell Computer understand the language of 0's and 1's called binary language, In early days of computing, instruction are provided using binary language, which is difficult for all of us, to read and write. So in O/s there is special program called Shell. Shell accepts your instruction or commands in English and translate it into computers native binary language.