Unix Shell Scripting Part - 2

if statement:

[oracle@ODIGettingStarted practice]$ vi ifstatement.sh
[oracle@ODIGettingStarted practice]$ cat ifstatement.sh
#If statement example
echo -n Enter first number:
read a
echo -n Enter second number:
read b
if [ $a -eq $b ]
then
   echo $a "is equal to" $b
else
   echo $a is not equal to $b
fi
[oracle@ODIGettingStarted practice]$ sh ifstatement.sh
Enter first number:5
Enter second number:5
5 is equal to 5
[oracle@ODIGettingStarted practice]$ sh ifstatement.sh
Enter first number:5
Enter second number:6
5 is not equal to 6
[oracle@ODIGettingStarted practice]$

ifelif statement:

[oracle@ODIGettingStarted practice]$ vi elifstatemnt.sh
[oracle@ODIGettingStarted practice]$ cat elifstatemnt.sh
#Purpose: Compare given two numbers
#Version: 1.0
#Created Date: Sat Sep 14 07:42:10 PM IST 2019
#Modified Date:
#Author: Rajasekhar Royal
# START #
echo -n Enter first number:
read a
echo -n Enter second number:
read b
if [ $a -eq $b ]; then
   echo $a is equal to $b
elif [ $a -gt $b ]; then
   echo $a is greater than $b
else
   echo $a is less than $b
fi
# END #
[oracle@ODIGettingStarted practice]$
[oracle@ODIGettingStarted practice]$ sh elifstatemnt.sh
Enter first number:35
Enter second number:20
35 is greater than 20
[oracle@ODIGettingStarted practice]$

while

[oracle@ODIGettingStarted practice]$ vi whiletest.sh
[oracle@ODIGettingStarted practice]$ cat whiletest.sh
myvar=1
while [ $myvar -le 10 ]
do
echo $myvar
        myvar=$(( $myvar + 1 ))
        sleep 0.5

done

[oracle@ODIGettingStarted practice]$ sh whiletest.sh
1
2
3
4
5
6
7
8
9
10
[oracle@ODIGettingStarted practice]$
[oracle@ODIGettingStarted practice]$ vi whiletest.sh
[oracle@ODIGettingStarted practice]$ cat whiletest.sh
myvar=1
while [ $myvar -le 5 ]
do
echo $myvar
        #myvar=$(( $myvar + 1 ))
        myvar=` expr $myvar + 1 `
        sleep 0.5
done
[oracle@ODIGettingStarted practice]$ sh whiletest.sh
1
2
3
4
5
[oracle@ODIGettingStarted practice]$

for loop

[oracle@ODIGettingStarted practice]$ vi forloop.sh
[oracle@ODIGettingStarted practice]$ cat forloop.sh
echo way-1
for i in 0 1 2 3 4 5
do
  echo $i
done
echo way-2
for i in {0..5}
do
  echo $i
done
echo way-3
max=5
for((i=0;i<=$max;i++));
do
  echo $i
done
[oracle@ODIGettingStarted practice]$ sh forloop.sh
way-1
0
1
2
3
4
5
way-2
0
1
2
3
4
5
way-3
0
1
2
3
4
5

[oracle@ODIGettingStarted practice]$