do_I_know_shell_scripting.md

Do I know shell scripting ?

Though I work with some of the basic unix command everyday. But I always ask myself this question. If you have the same feeling better you go through below reference and try out some of the basic shell programming of your own.

Where shell gets placed in Unix Architecture ?

Good guide for the beginners :

Ref : https://www.tutorialspoint.com/unix/shell_scripting.htm

Some of the basic theory oriented questions :

Ref : https://www.softwaretestinghelp.com/shell-scripting-interview-questions/

And here is my sample code :

#!/bin/bash
# How to take parameters in shell script ?
Name=$1
Value=$2

# How can someone read any user input ?
read email

# Printing user input(s) using echo command
echo $Name
echo $Value
echo $email

# Below block show basic while loop. 
# It's same like other language but just syntaxwise there are some differences
i=0
while [ $i -lt 20 ]
do
        echo $i 
        i=`expr $i + 1`
done

# Defining a string array 
nameArray="Sumit","Ghosh","John","Doe"

# Accessing previously defined array value(s) using for loop
for name in $nameArray
do
        echo $name
done

How can I run this shell script code ?

$ cd /home/<work_dir>/
$ vi CodeSample.sh
$ Copy above code content and save the file. 
$ Then to run this
$ bash ./CodeSample.sh "sumit" 3 or sh ./CodeSample.sh "sumit" 3
$ Script would wait on the user input. 
$ Type email id like - [email protected]
$ Then you would see output in the screen.