Shell Scripting Examples -Charan.pptx

Some examples of Shell Scripting

1. SOME EXAMPLES OF SHELL SCRIPTING By Charan

2. Script to Print 1 to 10 #!/bin/bash i =1 while [ $ i -le 10 ] do echo $ i i =$(($i+1)) Done Output:

3. Script to find Factorial of the given number #!/bin/bash echo "Enter the number" read n fact=1 for (( i =1;i<= n;i ++)) do fact=`expr $fact \* $ i ` Done The Factorial of $n is $fact Output:

4. Script to Add two numbers using function #!/bin/bash function add() { sum=$(($1 + $2)) echo "Sum = $sum" } a=10 b=20 add $a $b Output

5. Script to Display Multiplication table of Given Number using function #!/bin/bash tables() { i =1 while [ $ i -le 10 ] do echo " $1 * $ i =`expr $1 \* $ i ` " i =`expr $ i + 1` done } echo "Enter the number to Generate Multiplication table : " read n tables $ n

6. Output

7. Script to Find Highest and L owest value in 3 numbers using functions #!/ bin/bash greatest() { if [ $1 - gt $2 ] && [ $1 - gt $3 ] then echo "$1 is Greatest Number" elif [ $2 - gt $1 ] && [ $2 - gt $3 ] then echo "$2 is Greatest Number" else echo "$3 is Greatest Number" fi } Continued……..

8. lowest() { if [ $1 - lt $2 ] && [ $1 - lt $3 ] then echo "$1 is Lowest Number" elif [ $2 - lt $1 ] && [ $2 - lt $3 ] then echo "$2 is Lowest Number" else echo "$3 is Lowest Number" fi } echo "Enter Num1" read num1 echo "Enter Num2" read num2 echo "Enter Num3" read num3 greatest $num1 $num2 $num3 lowest $num1 $num2 $num3 Continued……..

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10. Script to Test if File Exists are not #!/bin/bash filename=$1 if [ -f "$filename" ]; then echo "File exists" else echo "File does not exist" fi Output

11. Script to Print File with Line Count #!/bin/bash myfile =$1 i =1 while read lines; do echo "$ i : $lines" i =$((i+1)) done < $ myfile Output

12. Script to Remove Duplicate lines from File #! / bin/bash echo -n "Enter Filename-> " read filename if [ -f "$filename" ]; then sort $filename | uniq | tee sorted.txt else echo "$filename is not found...try again" fi Continued……..

13. Output

14. Script to remove all empty files #! /bin/bash for x in * do if [ -s $x ] then continue else rm - rf $x fi done Output