Number Reverse Shell Programming | os | 4th sem cse | operating system lab | QT
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operating system laboratory for cse engineering playlist
• Operating System
Exp. No. 4 Number Reverse 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.
H) Number Reverse
To reverse a number – reverse.sh
echo -n "Enter a number : "
read n
rd=0
while [ $n -gt 0 ]
do
rem=`expr $n % 10`
rd=`expr $rd \* 10 + $rem`
n=`expr $n / 10`
done
echo "Reversed number is $rd"
Output
$ sh reverse.sh
Enter a number : 234
Reversed number is 432