read
file
if [ -e $file ]
then
if [ -r $file ]
then
echo The file exists and readable
else
echo The file exist but not readable
fi
else
echo The file is not exist
fi
Sunday, 17 June 2012
Write a shell script to accept the name of the user and check out if the same has logged in or not
echo
Enter user name:
read user
f=1
for i in `who|tr -s " "|cut -d
" " -f 1`
do
if [ $i = $user ]
then
echo The user is login now
f=0
break
fi
done
if [ $f != 0 ]
then
echo The user is logged off
fi
Write a Shell script to accept a string as command line argument and reverse the same
if [
$# -gt 0 ]
then
x=`echo $1 | wc -c`
x=`expr $x - 1`
final=""
while [ $x -gt 0 ]
do
c=`echo $1 | cut -c $x`
x=`expr $x - 1`
final=$final$c
done
fi
echo Reverse string is : $final
Write a Shell script, which counts the number of words in a file, without taking into consideration the blank space, tab spaces and the newline characters without using wc
read
file
l=`wc
-l $file|cut -d " " -f 1`
echo
$l
count=0
coch=0
for
(( i=1; i<=l; i++))
do
n=1
line=`head -$i $file|tail -1`
echo $line
ch=`echo $line|cut -c $n`
echo character is $ch
while [ "$ch" != ""
]
do
if [ "$ch" = "
" ]
then
count=`expr $count + 1`
else
coch=`expr $coch + 1`
fi
n=`expr $n + 1`
ch=`echo $line|cut -c $n`
done
done
echo
no. of space $count
echo
no. of characters $coch
Write a shell script to count number of spaces in a file.
count=0
space
for i in `cat a.sh`
do
if [ $i != " " ]
then
count=`expr $count + 1`
else
space=`expr $space + 1`
fi
done
echo $space
Write a shell script to display desired line from a file
read a;
read b;
head
-$a desline.sh|tail -$b;
Write a shell script that greets the user by saying Good Morning, Good Afternoon, and Good Evening according to the system time
d=`date|cut -d " " -f 4|cut -d
":" -f 1`
if [ $d -gt 4 -a $d -lt 12 ]
then
echo Good Morning
elif [ $d -gt 12 -a $d -lt 16 ]
then
echo Good Afternoon
elif [ $d -gt 16 -a $d -lt 20 ]
then
echo Good Evening
else
echo Good Night
fi
Write a shell script to check whether the entered number is prime or not
flag=0
read a;
for (( i=2; i<a; i++
))
do
b=`expr $a % $i`
if [ $b -eq 0 ]
then
flag=1
fi
done
if [ $flag -eq 1 ]
then
echo not prime number
else
echo prime number
fi
Write a shell script to generate fibonacci series.
echo
Enter the number of terms you want to be in the series;
read n
a=0
b=1
j=0
echo 0
echo
1
while
[ $j -lt $n ]
do
c=`expr $a + $b`
echo $c
a=$b
b=$c
j=`expr $j + 1`
done
Write a shell script which displays January if we enter Jan, Janu, Janua or January
read
mon;
case
$mon in
jan|janu|janua|january)
echo january ;;
*)
echo invalid ;;
esac
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