Initial commit

24_functions.sh

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+#!/bin/bash
+
+
+function welcomeNote {
+
+	echo "......................."
+	echo "Welcome"
+	echo "......................."
+}
+
+
+Welcome(){
+	echo "......................."
+        echo "Welcome"
+        echo "......................."
+
+}
+
+#to Call our function
+
+welcomeNote
+welcomeNote
+welcomeNote
+Welcome
+

25_functions_with_args.sh

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+#!/bin/bash
+
+function welcomenote {
+	echo "......................."
+        echo "Welcome $1"
+	echo "Age is $2"
+        echo "......................."
+}
+
+welcomenote ratu 20
+welcomenote pradhul 30

26_args.sh

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+#!/bin/bash
+
+set -x
+#to access the arguments
+
+echo "First argument is $1"
+echo "Second argument is $2"
+
+echo "All the arguments are - $@"
+echo "Number of arguments are - $#"
+
+
+#For loop to access the values from arguments
+for filename in $@
+do
+	echo "Copying file - $filename"
+done

27_shift_arguments.sh

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+#!/bin/bash
+
+# to create a user, provide username and description 
+
+echo "Creating user...."
+echo "Username is $1"
+
+shift 
+echo "Description is $@"

28_break.sh

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+#!/bin/bash
+
+#example fo break in a lopp
+#we just need to confirm if a given no. if present or not
+
+no=6
+
+for i in 1 2 3 4 5 6 7 8 9
+do
+	#break the loop if no. found
+	if [[ $no -eq $i ]]
+	then
+		echo "$no is found!!!"
+		break
+	fi
+	echo "Number is $i"
+done

29_continue.sh

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+#!/bin/bash
+
+#example of using continue in a loop
+# Suppose we only need to print odd no.
+
+for i in 1 2 3 4 5 6 7 8 9 10
+do
+	let r=$i%2
+	if [[ $r -eq 0 ]]
+	then 
+		continue
+	fi
+	echo "odd no. is $i"
+done

30_connectivity_check.sh

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+#!/bin/bash
+
+read -p "Which site you want to check? " site
+
+ping -c 1 $site &> /dev/null
+#sleep 5s
+
+if [[ $? -eq 0 ]]
+then
+	echo "Successfuly connected to $site."
+else
+	echo "Unable to connect with $site."
+fi

31_file_exist_check.sh

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+#!/bin/bash
+
+FILEPATH="/home/ratu/Desktop/programs/bash/practice/ratu.test"
+
+
+if [[ -f $FILEPATH ]]
+then
+	echo "File exist"
+else
+	echo "Creating file now..."
+	touch $FILEPATH
+fi
+

32_dice.sh

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+#!/bin/bash
+
+
+#generating a random number between 1 to 6
+
+no=$(( $RANDOM % 6 + 1 ))
+echo "Random Number is $no."

33_root_user_check.sh

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+#!/bin/bash
+
+# Checking if the user is root or not
+
+if [[ $UID -eq 0 ]]
+then
+	echo "User is root"
+else
+	echo "User is not root"
+fi

34_redirect.sh

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+#!/bin/bash
+
+ping -c 1 www.google.com > redirect.log

35_script_name.sh

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+#!/bin/bash
+
+echo "Name of this script is ${0}"

36_logger.sh

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+#!/bin/bash
+
+# Example of logging
+
+logger " This is a log from ${0}"

37_debugging.sh

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+#!/bin/bash
+
+#when set -e is there then the script is stopped when a command fails
+set -e
+
+pwd
+date
+cd /root
+hostname
+

Basic_operations/01_basic.sh

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+#!/bin/bash
+
+echo "HEY buddy!"

Basic_operations/02_comments.sh

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+#!/bin/bash
+
+echo "checking comments"
+
+#this is a single line comment
+
+<<comment
+this
+is a multiline
+COMMENT
+comment

Basic_operations/03_var.sh

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+#!/bin/bash
+
+
+a=10
+name="ratu"
+age=18
+
+echo "My name is $name and age is $age"
+
+name="paul"
+
+echo "my name is $(hostname)"

Basic_operations/04_read_only_var.sh

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+#!/bin/bash
+
+readonly variable="svce"
+
+echo $variable
+
+
+#read only variable cannot be initiated with a new value
+variable="rec"
+

Basic_operations/05_array.sh

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+#!/bin/bash
+
+myarray=( 1 20 30.5 Hello "HEY buddy!" )
+
+
+echo"all the values in array are ${myarray[*]}"
+echo "${myarray[2]}"
+
+#how to fin no. of avlues in an array
+
+echo "NO.of values, length of an array is ${#myarray[*]}"
+
+echo "values form index 2-3 ${myarray[*]:2:2}"
+
+
+#updating our array withh new values
+myarray+=( new apple 30 )
+
+echo "values of new array are ${myarray[*]}"

Basic_operations/06_keyvalue.sh

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+#!/bin/bash
+
+#how to store the key value pairs
+#declaring a array
+declare -A myarray
+
+myarray=( [name]=ratu [age]=18 [city]=chennai )
+
+echo "Name is ${myarray[name]}"
+
+echo "Age is ${myarray[age]}"

Basic_operations/07_string_operations.sh

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+#!/bin/bash
+
+myvar="Hey buddy, how are you?"
+
+myvarlength=${#myvar}
+echo "Length of the myvar is $myvarlength"
+
+echo "Upper case is ---${myvar^^}"
+echo "Lower case is ---${myvar,,}"
+
+#To replace a string here replace 1st term by 2nd one
+newvar=${myvar/buddy/ratu}
+echo "NEW VAR is ---${newvar}"
+
+#To slice a string :1st number is starting point :2nd number is the count of words to slice
+
+echo "After slice ${myvar:4:5}"

Basic_operations/08_user_interaction.sh

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+#!/bin/bash
+
+
+read -p "What is your name?" name 
+
+echo "Your name is $name"

Basic_operations/09_arithmetic_operation.sh

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+#!/bin/bash
+
+#Maths Calculation
+x=10
+y=2
+
+
+#won't work 
+mul=$x*$y
+echo "The multiplied value is :$mul"
+
+
+#should use let command to work
+
+let mul=$x*$y
+echo "the multiplied value is :$mul"
+
+let sum=$x+$y
+echo "the sum is $sum"
+
+#There is another version where we can also use double brackets to get the action of let command
+
+echo "subtraction is $(($x-$y))"

Basic_operations/10_if_else.sh

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+#!/bin/bash
+
+read -p "Enter your marks: " marks
+
+if [[ $marks -gt 40 ]]
+then
+	echo "Your are PASS."
+else
+	echo "You are FAIL!!"
+fi

Basic_operations/11_elif_demo.sh

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+#!/bin/bash
+
+read -p "Enter your marks: " marks
+
+if [[ $marks -ge 80 ]]
+then
+	echo "1st Division."
+elif [[ $marks -ge 60 ]]
+then
+	echo "2nd Division"
+elif [[ $marks -ge 40 ]]
+then
+	echo "3rd Division"
+else
+	echo "You are FAIL!!"
+fi

Basic_operations/12_case_demo.sh

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+#!/bin/bash
+
+echo "Provide an option"
+echo "a for Print date"
+echo "b for list of scripts"
+echo "c to check the current location"
+
+read choice
+
+case $choice in
+	a)date;;
+	b)ls;;
+	c)pwd;;
+	*)echo "Kindly provide a valid input."
+esac

Basic_operations/13_operators.sh

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+#!/bin/bash
+
+#AND OPERATOR
+
+read -p "What is your age?" age
+read -p "Your country: " country
+
+if [[ $age -ge 18 ]] || [[ $country == "india" ]]
+then
+	echo "You can vote"
+else
+	echo "You can't vote"
+fi

Basic_operations/14_ternary_ops.sh

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+#!/bin/bash
+
+#can be used instead of if-else statement
+#cond1 & if statement || else statement
+
+age=18
+
+[[ $age -ge 18 ]] && echo "Adult" || echo "minor"

loops/15_for_loop1.sh

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+#!/bin/bash
+
+for i in 1 2 3 4 5 6 7 8 9 10
+do
+	echo "Number is $i"
+done
+
+#for strings
+for name in Rathina Devan
+do
+	echo "Name is $name"
+done
+
+#for iterating through numbers
+
+for i in {1..5}
+do
+	echo "number is $i"
+	sleep 3s
+done
+

loops/16_for_with_file.sh

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+#!/bin/bash
+
+#getting values from a file names.txt
+
+FILE="/home/ratu/Desktop/programs/bash/practice/names.txt"
+
+for name in $(cat $FILE)
+do
+	echo "Name is $name"
+done