Prime Number Shell Programming | os | 4th sem cse | operating system lab | QT
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• Operating System
Exp. No. 4 Prime Number Shell Programming
Aim
To write simple shell scripts using shell programming fundamentals.
The activities of a shell are not restricted to command interpretation alone. The shell
also has rudimentary programming features. Shell programs are stored in a file (with
extension .sh). Shell programs run in interpretive mode. The original UNIX came with the
Bourne shell (sh) and it is universal even today. C shell (csh) and Korn shell (ksh) are also
widely used. Linux offers Bash shell (bash) as a superior alternative to Bourne shell.
I) Prime Number
Prime number – prime.sh
echo -n "Enter the number : "
read n
i=2
m=`expr $n / 2`
until [ $i -gt $m ]
do
q=`expr $n % $i`
if [ $q -eq 0 ]
then
echo "Not a Prime number"
exit
fi
i=`expr $i + 1`
done
echo "Prime number"
Output
$ sh prime.sh
Enter the number : 17
Prime number