Dr. Abdul Kalam

Introduction to Linux/Unix

History of Linux

Layered Architecture

Kernel & Shell

Common UNIX Flavors

System Boot Up

Virtual Consoles

User Management

User and Group Concepts

Creating, modifying and deleting User Accounts

Creating, modifying and deleting Group Accounts

Password Aging

Default User Files

The su command – switch between users

Understanding File and Directory Permissions

chown & chgrp

umask command

Bash Shell Scripting Part-1

Bash Shell

Configuration Scripts

Shell Variables

Environment Variables

Set & unset of variables

Exporting Variables

Configuring Shell

Use of /etc/profile and .profile

Exit status of a Command

cat Command

Standard Files

Performance Monitoring & Troubleshooting

System Status – Resource Consumption

System Status – Memory Usage

System Status – I/O Activity

System Status – CPU Usage

Resource Usage – Trends

top, iostat, vmstat, sar commands

Troubleshooting Methods

Process Profiling

Process Syscall Tracing – strace

Process Libcall Tracing – ltrace

Process Kernel/User Space Time Check

Filesystem Corruptions and Recovery