Shell Script to Find Factorial of a Number

Method 1:#!/bin/bash# fact1# Finding factorial of a given number#echo "Enter a number"read numfact=1n=$numwhile [ $num -ge 1 ]do fact=`echo $fact \* $num|bc` # You can use bellow commands also # fact=$((fact*num)) # fact=`expr $fact \* $num` # But maximum integer value that bash can handle is # 9223372036854775807. # An operation that takes a variable outside these # limits will give an erroneous result. To solve this # problem store numbers as strings and use bc for math. let num--doneecho "factorial of $n is $fact"Method...

For Loop Example-2

#!/bin/bash# Usage: forloop2.sh or forloop2.sh number# Example using for loop# Prints following format# *# * *# * * *# * *# *n=${1-10} # If command line argument not supplied default is 10t=`expr $((2*$n - 1 ))`a=$nb=$(($a+1))for (( i=1 ; i<=$n ;i++ ))do echo -e -n "\033[47m" a=$(($b-1)) b=$a k=1for (( j=1 ; j<=$t ; j++ )) do if [ $j -eq $a ] then echo -e "\033[43m * \033[47m\c" if [ $k...

How to Execute a Shell Script

Defining the Shell TypeTo make a bash script crate a new file with a starting line like:#!/bin/bash It is important that the path to the bash is proper and first two characters must be “#!” . The shell from which you are starting the script will find this line and hand the wholescript over to bash. Without this line the script would be interpreted by the same type of shell as the one, from whichit was started.But since the syntax is different for all shells, it is necessary to define the shell with that line.Some typical interpreters...

Bash for loop example-1

#!/bin/bash # Usage: script.sh number# A for loop example produces following output## *# * *# * * *# * * * *# * * * * *#Method1c=1n=$1echo -e "\033[47m\c" #colourizing outputfor ((row=1;row<=n;row++))do for ((i=row;i<n;i++)) do echo -n ' ' done for ((k=1;k<=c;k++)) do if [ $((k%2)) -eq 0 ] then ...

Bash for Loop Syntax

A 'for loop' is a bash programming language statement which allows code to be repeatedlyexecuted. A for loop is classified as an iteration statement i.e. it is the repetition of a processwithin a bash script.For example, you can run UNIX command or task 5 times or read and process list of files usinga for loop. A for loop can be used at a shell prompt or within a shell script itself.for loop syntaxNumeric ranges for syntax is as follows:for VARIABLE in 1 2 3 4 5 .. Ndo command1 command2 commandNdoneExamples:#!/bin/bahfor i in 1 2...

Shell Script To Print Pyramid - Using while Loop

#!/bin/bash # Usage: scriptname argument # Here argument is height of pyramid # Output would be pyramid pattern of stars # 0 * # 1 *** # 2 ***** # 3 ******* # 4 ********* # 5 *********** # 6 ************* # . *************** # . ***************** # . ******************* # ...

Shell Script To Print Pyramid-Using for Loop

#!/bin/bash# Usage: scriptname argument# Here argument is height of pyramid# Output would be pyramid pattern of stars# 0 *# 1 ***# 2 *****# 3 *******# 4 *********# 5 ***********# 6 *************# . ***************# . *****************# . *******************# n-1 *********************#...