100 Shell Programs in Unix by Sarika Jain

Author:Sarika Jain
Language: eng
Format: epub, mobi

39. Write a shell script to generate first ‘n’ terms of the following sequence without using multiplication-1 2 4 8 16 32…………n.

$vi prg39

clear

echo enter the value of n

read n

echo

i=1

while test $i –le $n

do

echo $i

i=‘expr $i + $i’

done

Sample Run

$sh p39

enter the value of n

20

1

2

4

8

16

40. Write a shell script to find greatest common divisor (GCD) for two given numbers.

$vi prg40

clear

echo enter numbers a and b

read a b

while [ 1 ] # infinite loop

do

c=‘expr $a % $b’

if [ $c -eq 0 ]

then

echo GCD = $b

exit

fi

a=$b

b=$c

done

Sample Run

$sh prg40

enter numbers a and b 47 3 GCD = 1

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