Unix Shell Scripting Training

Introduction to Unix processes
Program (vs.) Process
System processes & commands
User processes & commands
Finding processes information using ‘grep’
Background & foreground processing
Kill signal
Setting process priorities
Avoiding hang-ups using ‘nohup’

Introduction to job scheduling
Run jobs at regular intervals using crontab
Run jobs at specific intervals using ‘at’.

On-line communication using write, wall, talk, etc.
Offline communication using mail, news, etc.

Introduction to ‘echo’ command
System defined environment variables
User defined environment variables
Creating user defined environment variables.

Introduction to Visual Editor
Understanding 3 basic modes of operations
Cursor Movement commands
Scrolling commands
Editing text commands, Copying and pasting text
Shell commands, Text Buffers, Search commands.

Introduction to system files (/etc/passwd)
Creating user aliases ($HOME/.bashrc)
Sourcing environment ($HOME/.bash_profile)
Logout action file ($HOME/.bash_logout).

Introduction to Shell
Types of shells
Evolution/History of various Unix shells
Introduction to Shell scripting
Difference between programming and scripting
Steps in handling shell scripts
Writing first shell script – “Hello World…!”.

Adding comments
Displaying output to screen
Variables declaration
Arithmetic operations
Read Input from command line
Interactive Addition program
Positional Parameters
Command Line arguments
Arithmetic operations using command line arguments
Command line arguments using SHIFT operator
Scope of Variables.

Sequence control structure (vs.) decision-making structure
If-then-if statement
If-then-else-if statement
If-then-if-else-if statement TEST command
Case – esac statement
String operations, Examples.

For Loop, While loop, Until loop, Loop nesting, Break/continue commands
Examples on For/While/Until
For + ls example
While + case example
If + grep example
For + sed + awk example.

Introduction to Archiving
Introduction to Compression
Archive (vs.) compression
Creating archives
Compressing & uncompressing files
Compressed Archives.

Transferring files between Unix servers using FTP
Remote login to another Unix server
Starting and shutting down the servers
Writing C programs in Unix OS
Compiling and debugging C programs in Unix OS.

SED Introduction
Difference between “” and ‘’, s for substitution
SED Delimiters
Using & as the matched string
SED Multiple instructions
Multiple instructions through script, Printing, Deleting in SED, cut, tr commands
Lab Exercises.

AWK Introduction
AWK Basic syntax & Examples
AWK Inbuilt variables (FS, OFS, NR, RS, FILENAME), BEGIN, PRINT, END blocks in AWK
Inbuilt AWK functions (length, Index, sub, substr, tolower, toupper, split), IF Condition, Loops (While, DO … WHILE, FOR), Break - Continue - Exit, Arrays
Lab Exercises.