Merge pull request #726 from rishabh-malik/master

added shell scripting

Author: t2013anurag

shell_scripting/arithmetic-float.sh

@@ -0,0 +1,8 @@
+#arithmetic operations on float and real nos
+a=10.5 b=3.5
+# using | for feeding arithmetic operations to bc
+c=`echo $a + $b | bc`
+d=`echo $a - $b | bc`
+e=`echo $a \* $b | bc`
+f=`echo $a / $b | bc`
+echo $c $d $e $f

shell_scripting/arithmetic-operation.sh

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+#arithmetic operations using expr
+a=30 b=15
+echo `expr $a + $b`
+echo `expr $a - $b`
+echo `expr $a \* $b`
+echo `expr $a / $b`
+echo `expr $a % $b`

shell_scripting/break-statement.sh

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+#while loop in action
+count=1
+while [ $count -le 10 ]
+do
+	if [ $count -eq 4 ]
+	then
+		break
+	fi
+	echo $count
+	count=`expr $count +1`
+done
+
+

shell_scripting/case-statement.sh

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+echo "Enter a character:\c"
+read var
+case $var in
+#matching var to from a to z 
+[a-z])
+echo "You entered a lowercase alphabet"
+;;
+#for ending case ;;
+[A-Z]) 
+echo "You entered a uppercase alphabet"
+;;
+[0-9])
+echo "You entered a digit"
+;;
+?) 
+echo "You entered a special character"
+;; 
+*)  
+echo "You entered multiple characters"
+;;
+esac

shell_scripting/change-permission.sh

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+#to change the permission of file from script
+chmod 744 $1
+ls -l $1

shell_scripting/continue.sh

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+#while loop in action
+count=1
+while [ $count -le 10 ]
+do
+	if [ $count -eq 4 ]
+	then
+		continue
+	fi
+	echo $count
+	count=`expr $count +1`
+done
+
+

shell_scripting/counting.sh

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+#count the no of positional parameters
+#count no of items
+echo "total no of items in current dir is: $#" 

shell_scripting/elif.sh

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+echo "Enter a no between 10 and 20:\c"
+read num
+#lt=less than
+if [ $num -lt 10 ]
+then 
+echo "Under 10"
+#greater than
+elif [ $num -gt 20 ]
+then
+echo 
+echo "More than 20"
+else
+echo "thats right"
+fi

shell_scripting/escape-sequence.sh

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+#escape sequences in echo
+echo "hello world"
+#new line
+echo "hello \nworld"
+#carriage return
+echo "hello \rworld"
+#tab
+echo "hello \tworld"
+#backspace
+echo "hello world \b\b\b"
+#bold
+echo "\033[1mHello world\033[0m"
+#reverse video format
+echo "\033[7mHello world\033[7m"

shell_scripting/file-test.sh

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+#check if the given file exist in following dir or not
+echo "Enter a name:\c"
+read fname
+#-f for file -d for dir
+#-s for size 
+if [ -f $fname ]
+then 
+echo "Yes its a file"
+else
+echo "No its not a file"
+fi