//particular user has logged in or not
echo "Enter username"
read username
c=`who|grep -c $username`
echo $c
if [ $c -gt 0 ]
then
echo "$username is logged"
else
echo "No such user"
fi
output:
Enter username
anil
anil is logged
// shell program to check whether a given file has read write execute perimissions
echo "enter your file name"
read fname
if [ -r $fname ]
then
echo "given file has read permission"
fi
if [ -w $fname ]
then
echo "given file has write permission"
fi
if [ -x $fname ]
then
echo "given file has execute permission"
fi
output:
enter your file name
hello.c
given file has read permission
given file has write permission
//shell program to count the number of files in a directory
echo "enter a directory name"
read dname
i=0
for k in `ls $dname`
do
i=`expr $i + 1 `
done
echo "no of files in directory are $i"
output:
enter a directory name
netsem2014
no of files in directory are 24
// shell program to check whether the given number is prime or not
echo "enter a number"
read num
i=2
flag=0
while [ $i -lt $num ]
do
if [ `expr $num % 2` -eq 0 ]
then
flag=1
fi
i=`expr $i + 1`
done
if [ $flag -eq 0 ]
then
echo "given number is prime"
else
echo "given unmber is not a prime"
fi
output:
enter a number
23
given number is not a prime
//shell program to check print fibonacci sequence with in the given range
echo "enter the range"
read n
a=0
b=1
echo $a
echo $b
c=0
c=`expr $a + $b`
while [ $c -lt $n ]
do
echo $c
a=$b
b=$c
c=`expr $a + $b`
done
// shell program to concatenate two strings
echo "enter first string"
read s1
echo "enetr second string "
read s2
s3=$s1$s2
len=`echo $s3 | wc -c`
len=`expr $len - 1`
echo " concatenated string is $s3 of length $len "
output:
enter first string
raj
enter the second string
kumar
concatenated string is rajkumar of length 8
//shell program to find the reverse of a given string
echo "Enter any string:"
read string
len=`expr $string|wc -c`
len=`expr $len - 1`
while [ $len -gt 0 ]
do
r=`expr $string|cut -c $len`
rev=$rev$r
len=`expr $len - 1`
done
echo "The reverse of given string is $rev"
output:
enter any string
anil
The reverse of given string is lina
//shell program to check whether the given string is palindrome or not
echo "Enter a string"
read str
len=`echo $str | wc -c`
len=`expr $len - 1`
i=1
j=`expr $len / 2`
while [ $i -le $j ]
do
k=`echo $str | cut -c $i`
l=`echo $str | cut -c $len`
if [ $k != $l ]
then
echo "String is not palindrome"
exit
fi
i=`expr $i + 1`
len=`expr $len - 1`
done
echo "String is palindrome"
ouput
Enter a string
madam
given string is palindrome
// shell program to find the grade of students
echo "enter your name and number"
read name num
echo "enter your five subjects marks"
read sub1
read sub2
read sub3
read sub4
read sub5
total=`expr $sub1 + $sub2 + $sub3 + $sub4 + $sub5`
avg=`expr $total / 5`
echo "$name \t $num"
if [ $avg -ge 80 ]
then
echo "grade A"
elif [ $avg -ge 70 -a $avg -lt 80 ]
then
echo "grade B"
elif [ $avg -ge 60 -a $avg -lt 70 ]
then
echo "grade C"
elif [ $avg -ge 50 -a $avg -lt 60 ]
then
echo "grade D"
elif [ $avg -ge 40 -a $avg -lt 50 ]
then
echo " grade E"
else
echo "grade F"
fi
enter your five subject marks
60 60 60 60 60
raj 120A0501 grade C
// shell program to calculate the employee net salary
echo "enter your name "
read empname
echo "enter your empid"
read empid
echo " enter your basic salary"
read basic
HRA=`expr $basic \* 18 / 100`
DA=`expr $basic \* 35 / 100`
IT=`expr $basic \* 14 / 100`
TA=`expr $basic \* 10 / 100`
total=`expr $basic + $HRA + $DA + $IT + $TA`
echo "$empid \t $empname \t basic salary is $basic \t HRA is $HRA DA is $DA IT is $IT \t TA is $TA and total salary is $total"
output:
enter your name
raj
enter your empid
120A0501
enter your basic salary
10000
120A0501 raj basic salary is 10000 HRA is 1800 DA is 3500 IT is 1400 TA is 1000 and total salary is 17700
// Shell program to fine GCD of two given numbers
echo "enter two numbers"
read a
read b
while [ $a -ne $b ]
do
if [ $a -gt $b ]
then
a=`expr $a - $b`
else
b=`expr $b - $a`
fi
done
echo "gcd is "
echo $a
output:
enter two numbers
10 25
gcd is 5
//menu options
echo "1 present working directory 2 display date 3 display users logged into the system
echo "enter your choice"
read a
case $a in
1)pwd;;
2)date;;
3)who;;
esac
output:
1. present working directory 2. display date 3. display users logged into the system.
enter your choice
1
// shell program to check whether the given number is armstrong or not
echo "enter a number"
read c
x=$c
sum=0
r=0
n=0
while [ $x -gt 0 ]
do
r=`expr $x % 10`
n=`expr $r \* $r \* $r`
sum=`expr $sum + $n`
x=`expr $x / 10`
done
if [ $sum -eq $c ]
then
echo "armstrong number"
else
echo "not armstrong number"
fi
output:
enter a number
153
//shell program to print mathematical tables
echo "enter your range"
read x
i=1
res=0
while [ $i -le $x ]
do
echo "Multiplication table $i"
j=1
while [ $j -le 10 ]
do
res=`expr $i \* $j`
echo "$i*$j= $res"
j=`expr $j + 1`
done
i=`expr $i + 1`
echo ""
echo ""
echo ""
done
output;
enter your range
2
--------
--------
//shell program to print the ncr values
fact()
{
i=1
a=1
while [ $i -le $x ]
do
a=`expr $a \* $i`
i=`expr $i + 1`
done
}
echo "enter the n value"
read n
echo "enter the r value"
read r
x=$n
fact
nf=$a
x=$r
fact
rf=$a
x=`expr $n - $r`
rf=$a
fact
nrf=$a
den=`expr $rf \* $nrf`
res=`expr $nf / $den`
echo $res
output:
enter the n value
4
enter the r value
1
4
//shell program to check whether the give number is palindrome or not
echo "Enter any number"
read num
m=`expr $num`
sum=0
while [ $num -gt 0 ]
do
r=`expr $num % 10`
sum=`expr $sum \* 10 + $r`
num=`expr $num / 10`
done
if [ $m -eq $sum ]
then
echo "Given number is palindrome"
else
echo "The number is not palindrome"
fi
output:
Enter any number
121
Given number is palindrome
//shell program to implement bubble sort
echo "Enter your range"
read n
i=0
echo "Enter the elements"
while [ $i -lt $n ]
do
read num
eval arr$i=$num
i=`expr $i + 1`
done
i=0
j=0
while [ $i -lt $n ]
do
j=`expr $i + 1`
while [ $j -lt $n ]
do
eval x=\$arr$i
eval y=\$arr$j
if [ $x -gt $y ]
then
x=`expr $x + $y`
y=`expr $x - $y`
x=`expr $x - $y`
eval arr$i=$x
eval arr$j=$y
fi
j=`expr $j + 1`
done
i=`expr $i + 1`
done
echo "The array after sorting is "
i=0
while [ $i -lt $n ]
do
eval t=\$arr$i
echo "$t"
i=`expr $i + 1`
done
//shell program to fin min and max elements in a array
echo "Enter your range"
read n
i=0
echo "Enter the elements"
while [ $i -lt $n ]
do
read num
eval arr$i=$num
i=`expr $i + 1`
done
i=0
eval min=\$arr$i
eval max=\$arr$i
i=1
while [ $i -lt $n ]
do
eval t=\$arr$i
if [ $t -lt $min ]
then
min=$t
elif [ $t -gt $max ]
then
max=$t
fi
i=`expr $i + 1`
done
echo "The minimum value of the array is $min"
echo "The maximum value of the array is $max"
output:
Enter your range
5
Enter the elements
10 5 20 2 45
The minimum value of array is 2
The maximum value of array is 45
//shell program to implement linear search
echo "enter the size"
read n
i=0
echo "enter the elements"
while [ $i -lt $n ]
do
read num
eval arr$i=$num
i=`expr $i + 1`
done
echo "enter the key"
read key
i=0
while [ $i -lt $n ]
do
eval t=\$arr$i
if [ $t -eq $key ]
then
echo "found at `expr $i + 1`"
exit
else
i=`expr $i + 1`
fi
done
output:
enter the size
5
enter the elements
10 23 12 78 90
enter the key
12
found at third location
//shell program to implement binary search
echo "enter array size"
read n
i=0
echo "enter the elements in order"
while [ $i -lt $n ]
do
read num
eval arr$i=$num
i=`expr $i + 1`
done
echo "enter the key"
read key
beg=0
end=`expr $n - 1`
while [ $beg -le $end ]
do
r=`expr $beg + $end`
mid=`expr $r / 2`
eval t=\$arr$mid
if [ $t -eq $key ]
then
echo "found at `expr $mid + 1`"
exit
elif [ $key -gt $t ]
then
beg=`expr $mid + 1`
elif [ $key -lt $t ]
then
end=`expr $mid - 1`
fi
done
if [ $beg -gt $end ]
then
echo "not found"
fi
30
30 is found at location 3
//awk program to check whether the student is pass or fail
awk 'BEGIN{print"\nNanme\tds\tc\tjava\ttotal\taverage\tpassoorfail"}
{
total=0
total=total+$2+$3+$4
avg=total/3
if ( $2>=35&&$3>=35&&$4>=35 )
{
str="pass"
}
else
{
str="fail"
}
print"\n"$1"\t"$2"\t"$3"\t"$4"\t"total"\t"avg"\t"str
}' pass //note pass is text file containing student data
//awk program to print student marks list
awk 'BEGIN{print"\nNanme\tds\tc\tjava\ttotal\taverage"}
{
total=0
total=total+$2+$3+$4
avg=total/3
print"\n"$1"\t"$2"\t"$3"\t"$4"\t"total"\t"avg
}' pass //note: pass is text file which contains student data
output:
Name ds c java total average
anil 90 90 60 240 80
raj 60 70 80 210 70
kumar 50 50 50 150 50
//count characters
awk 'BEGIN{count=0;print "CHARACTERS"}
{
len=0
len=length($0)
count=count+len
}
END{print "No of characters in file are: \t"count}' sample.c // note: sample.c is text document
Output:
No of characters in file are 37
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