#!/bin/sh

#count the number of files in current directory, and check if the number is equal to or greater than or less than 26

#NOF represents number of files

NOF=`ls -l | wc -l`

if [ $NOF -eq 26 ]
then
echo “No of files and directories is equal to 26”
fi

if [ $NOF -gt 26 ]
then
echo “No of files is greater than 26”
fi

if [ $NOF -lt 26 ]
then
echo “No of files is less than 26”
fi

exit

Example Output

bash-3.2$ ./while-loop-example.sh
Enter your Number
10
10 * 1 = 10
10 * 2 = 20
10 * 3 = 30
10 * 4 = 40
10 * 5 = 50
10 * 6 = 60
10 * 7 = 70
10 * 8 = 80
10 * 9 = 90
10 * 10 = 100

The Code

#!/bin/ksh

#example : how to use while loop in shell programming

multiplication()
{

#clear
i=1
while (( i <= 10 )) do echo "$Y * $i = `expr $Y \* $i`" (( i = i + 1 )) done } echo "Enter your Number" read X case "$X" in 1) Y=1 multiplication ;; 2) Y=2 multiplication ;; 3) Y=3 multiplication ;; 4) Y=4 multiplication ;; 5) Y=5 multiplication ;; 6) Y=6 multiplication ;; 7) Y=7 multiplication ;; 8) Y=8 multiplication ;; 9) Y=9 multiplication ;; 10) Y=10 multiplication ;; esac exit

#!/bin/ksh

# on every thursday and friday tar all contents of /etc folder into /export/home/shell/test/. On thursday only create a log file with the list of files
#in the tar file. On thursday untar /export/home/shell/test/etc.tar into vfstab . Then log vfstab exist or not information

DAY=`date +%a`
DATESTAMP=`date +%m-%d-%Y-%H:%M`

if [[ “$DAY” == Mon ]]
then

echo “Today is Monday”

elif [[ “$DAY” == Tue ]]
then

echo “Today is Tuesday”

elif [[ “$DAY” == Wed ]]
then

echo “Today is Wednesday”

elif [[ “$DAY” == Thu ]]
then

echo “Today is Thursday” >> /export/home/shell/test/log/backup-$DATESTAMP.log
cd /etc
tar cvf /export/home/shell/test/etc.tar * >> /export/home/shell/test/log/backup-$DATESTAMP.log
cd /export/home/shell/test
tar xvf etc.tar vfstab

if [[ -f vfstab ]]
then
echo “file vfstab exist” >> /export/home/shell/test/log/backup-$DATESTAMP.log
else
echo “file vfstab does not exist” >> /export/home/shell/test/log/backup-$DATESTAMP.log
fi

elif [[ “$DAY” == Fri ]]
then

echo “Today is Friday”
cd /etc
tar cvf /export/home/shell/test/etc.tar *

elif [[ “$DAY” == Sat ]]
then
echo “Today is Saturday”

else
echo “Today is Sunday”

fi

exit

#!/bin/sh

#If then else example
#if elif else

NOF=5

if [ $NOF -eq 27 ]

then

echo “No of files and directories = 27”

elif [ $NOF -gt 27 ]

then

echo “No of files are dir are greator than 27”

else

echo “No of files and directories are less than 27”

fi

exit

bash-3.2$ cat ksh_case_example_1.sh
#!/bin/ksh

#show today’s day name
DAY=`date +%a`

#show value of $DAY
echo $DAY

#based on the value of the DAY variable show the day name in full format
case “$DAY” in

Mon)
echo “Monday”
;;

Tue)
echo “Tuesday”
;;

Wed)
echo “Wednesday”
;;

Thu)
echo “Thursday”
;;

Fri)
echo “Friday”
;;

Sat)
echo “Saturday”
;;

Sun)
echo “Sunday”
;;

esac

—————

Output – ফলাফল

bash-3.2$ ./ksh_case_example_1.sh
Sun
Sunday

bash-3.2$ cat multiplication.sh
#!/bin/bash

# Example use of function/method declaration in Shell Programming
# Example use of for loop

#a function that will multiply 1 to 10 with 5
multiplication()
{
x=5
for i in {1..10}
do
echo $i
echo “the multiplication result is:” $(($i*$x))
done
}

echo “Print 1 to 10; also multiply each number with 5 and show the multiplication result”
multiplication

—————————–
Output – ফলাফল

bash-3.2$ ./multiplication.sh
Print 1 to 10; also multiply each number with 5 and show the multiplication result
1
the multiplication result is: 5
2
the multiplication result is: 10
3
the multiplication result is: 15
4
the multiplication result is: 20
5
the multiplication result is: 25
6
the multiplication result is: 30
7
the multiplication result is: 35
8
the multiplication result is: 40
9
the multiplication result is: 45
10
the multiplication result is: 50

Example Output:
10 * 1 = 10
10 * 2 = 20
10 * 3 = 30
10 * 4 = 40
10 * 5 = 50
10 * 6 = 60
10 * 7 = 70
10 * 8 = 80
10 * 9 = 90
10 * 10 = 100

———————————-

#!/bin/bash
multi()
{
clear
for ((i=1;i<=10;i++)); do echo "$Y * $i = `expr $Y \* $i`" done } echo "Enter your Number" read X case "$X" in 1) Y=1 multi ;; 2) Y=2 multi ;; 3) Y=3 multi ;; 4) Y=4 multi ;; 5) Y=5 multi ;; 6) Y=6 multi ;; 7) Y=7 multi ;; 8) Y=8 multi ;; 9) Y=9 multi ;; 10) Y=10 multi ;; esac exit Output 7 * 1 = 7 7 * 2 = 14 7 * 3 = 21 7 * 4 = 28 7 * 5 = 35 7 * 6 = 42 7 * 7 = 49 7 * 8 = 56 7 * 9 = 63 7 * 10 = 70