Operators and Decision Making

03.Operators/01.Arithmetic.sh

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+#!/bin/bash
+
+a=10
+b=20
+
+add=$((a + b))
+echo Addition of a and b are $add
+
+sub=$((a - b))
+echo Subtraction of a and b are $sub
+
+mul=$((a * b))
+echo Multiplication of a and b are $mul
+
+div=$((a / b))
+echo division of a and b are $div
+
+mod=$((a % b))
+echo Modulus of a and b are $mod
+

03.Operators/02.Relational.sh

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+#!/bin/bash
+
+a=10
+b=20
+
+if(( $a==$b ))
+then
+	echo a is equal to b.
+else
+	echo a is not equal to b.
+fi
+
+if(( $a!=$b ))
+then
+	echo a is not equal to b.
+else
+	echo a is equal to b.
+fi
+
+if(( $a<$b ))
+then
+	echo a is less than b.
+else
+	echo a is not less than b.
+fi
+
+if(( $a<=$b ))
+then
+	echo a is less than or equal to b.
+else
+	echo a is not less than or equal to b.
+fi
+
+if(( $a>$b ))
+then
+	echo a is greater than b.
+else
+	echo a is not greater than b.
+fi
+
+if(( $a>=$b ))
+then
+	echo a is greater than or equal to b.
+else
+	echo a is not greater than or equal to b.
+fi

03.Operators/03.Logical.sh

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+#!/bin/bash
+
+a=true
+b=false
+
+if [[ "$a" == "true" && "$b" == "false" ]];
+then
+	echo Both conditions are true.
+else
+	echo Both conditions are not true.
+fi
+
+if [[ "$a" == "true" || "$b" == "false" ]];
+then
+	echo At least one of them is true.
+else
+	echo None of them is true.
+fi
+
+if [[ ! "$a" == "true" ]];
+then
+	echo "a" was initially false.
+else
+	echo "a" was initially true.
+fi

03.Operators/04.Bitwise.sh

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+#!/bin/bash
+
+a=7
+b=4
+
+b_AND=$(( a&b ))
+echo Bitwise AND of a and b is $b_AND
+
+b_OR=$(( a|b ))
+echo Bitwise OR of a and b is $b_OR
+
+b_XOR=$(( a^b ))
+echo Bitwise XOR of a and b is $b_XOR
+
+b_Complement=$(( ~a ))
+echo Bitwise Compliment/NOT of a is $b_Complement
+# n -> -(n+1)
+
+l_shift=$(( a<<2 ))
+echo Left Shift of a is $l_shift
+# 00000111 << 00001110 << 00011100
+
+r_shift=$(( b>>2 ))
+echo Right Shift of b is $r_shift
+# 00000100 >> 00000010 >> 00000001

03.Operators/05.FileTest.sh

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+#!/bin/bash
+
+FileName="04.Bitwise.sh"
+
+if [ -e $FileName ]
+then
+	echo Yes! The file exists
+else
+	echo No! The file doesn"'"t exist
+fi
+
+if [ -s $FileName ]
+then
+	echo File is not empty.
+else
+	echo File is empty.
+fi
+
+if [ -r $FileName ]
+then
+	echo File has read access.
+else
+	echo File does not has read access.
+fi
+
+if [ -w $FileName ]
+then
+	echo The file has write access.
+else
+	echo The file does not has write access.
+fi
+
+if [ -x $FileName ]
+then
+	echo The file has execute access.
+else
+	echo The file doesn"'"t has execute access.
+fi

04.DecisionMaking/01.If.sh

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+#!/bin/bash
+
+#Initializing two variables
+
+a=20
+b=40
+
+# Equal or Not check
+
+if [ $a == $b ]
+then
+    echo "a is equal to b"
+fi
+
+# Not equal check
+
+if [ $a != $b ]
+then
+    echo "a is not equal to b"
+fi

04.DecisionMaking/02.If-Else.sh

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+#!/bin/bash
+
+# Initializing a and b as variables
+
+a=20
+b=20
+
+if [ $a == $b ]
+then
+	echo "a is equal to b"
+else
+	echo "a is not equal to b"
+fi

04.DecisionMaking/03.If-Elif-Else.sh

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+number=4
+
+if [ $number -eq 1 ]; then
+    echo value of number is 1
+elif [ $number -eq 2 ]; then
+    echo value of number is 2
+else
+    echo Invalid value
+fi

04.DecisionMaking/04.If-Then-Elif-Else.sh

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+#!/bin/bash
+
+total=10
+
+if [ $total -eq 1000 ]
+then
+ echo "total is equal to 1000"
+elif [ $total -lt 1000 ]
+then
+ echo "Total is less than 1000"
+else
+ echo "Total is greater than 1000"
+fi

04.DecisionMaking/05.SwitchCase.sh

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+#!/bin/bash
+
+DOGS="husky"
+
+#Pass the variable in string
+
+case "$DOGS" in
+	#case 1
+	"indie") echo "Found in moderate temperature places" ;;
+
+	#case 2
+	"scoobydoo") echo "Found only in cartoons" ;;
+
+	#case 3
+	"husky") echo "Found in very cold places" ;;
+esac