usn: subjectcode:13mca17hanumanthareddygn.weebly.com/uploads/3/8/6/9/3869… · web view1a. write a...

USN: SUBJECTCODE:13MCA17

1a. Write a shell script that takes a valid directory name as an argument

and recursively descend all the sub-directories, finds the maximum length

of any file in that hierarchy and writes this maximum value to the standard

output

SOURCE CODE

echo "Enter directory name"

read dir1

if [ ! -d $dir1 ];then

echo "Directory not found"

exit

fi

large=0;

for file1 in `find $dir1 -type f`

do

size1=`stat -c %s $file1`

echo "size of the file $file1 is $size1"

if [ $size1 -gt $large ];then

large=$size1

lar_file=$file1

fi

done

echo "Largest file is:$lar_file"

echo "And its size is:$large"

MCA Department, PG Studies, VTU, Belgaum Page NO -


Output 1:

[reddy@localhost ~]$ sh 1a.sh

enter the valid directory name:

ram

enter a valid directory name!!!!

Output 2:

[reddy@localhost ~]$ sh 1a.sh

enter the valid directory name:

kanasu

the file kanasu/1a.sh size is 392

the file kanasu/file2 size is 49




the large size of file kanasu/file4 is 392



1b. Write a shell script that accepts a path name and creates all the components in that path name as directories. For example, if the script is named mpc, then the command mpc a/b/c/d should create directories a, a/b, a/b/c, a/b/c/d.

SOURCE CODE

if [ $# -lt 1 ];then

echo "NO arguments passed"

exit

else

echo $1 | tr '/' ' '>tmp_file

for i in `cat tmp_file`

do

mkdir $i

cd $i

done

echo "All directories have been created"

echo "To view all directories execute ls -R command"

fi



Output1:

[reddy@localhost kanasu]$ sh 1b.sh

NO arguments passed

Output2:

[reddy@localhost kanasu]$ sh 1b.sh a/b/c/d

All directories have been created

To view all directories execute ls -R command

[reddy@localhost kanasu]$ ls -R

.:

1a.sh 1b.sh a file1 file2 file3 file4 tmp_file

./a:

b

./a/b:

c

./a/b/c:

d

./a/b/c/d:



2a. Write a shell script that accepts two file names as arguments ,checks if

the permissions for these files are identical and if the permissions are

identical, output common permissions and otherwise output each file name

followed by its permissions.

SOURCE CODE

if [ $# -eq 0 ];then

echo "No arguments passed"

exit

fi

if [ $# -lt 2 ] || [ $# -gt 2 ];then

echo "Please enter proper input"

exit

fi

if [ ! -e $1 ] || [ ! -e $2 ];then

echo "File does not exists"

exit

fi

p1=`ls -l $1 | cut -d " " -f1`

p2=`ls -l $2 | cut -d " " -f1`

if [ $p1 == $p2 ];then

echo "Permissions of both the files are identical"

echo "Identical permissions are:$p1"

else

echo "Permissions of the files are not identical"

echo "Permissions of file one are:$p1"

echo "Permissions of file two are:$p2"

fi



Output1:

[reddy@localhost kanasu]$ sh 2a.sh

No arguments passed

Output2:

[reddy@localhost kanasu]$ sh 2a.sh file1 file2

Permissions of both the files are identical

Identical permissions are:-rw-rw-r--.

Output3:


Permissions of the files are not identical

Permissions of file one are:-rw-rw-r--.

Permissions of file two are:-rwxrwxrwx.



2b. Write a shell script which accepts valid log-in names as arguments and

prints their corresponding home directories,if no argumrnts are

specified,print a suitable error message.

SOURCE CODE


echo "No argument in command line"

exit

else

for file in $*

do

if grep $file /etc/passwd

then

x=`grep $file /etc/passwd | cut -d ":" -f 6`

echo "The valid username is :$x"

else

echo "You have not entered a valid username"

fi

done

fi



Output1:


No argument in command line

Output2:

[reddy@localhost kanasu]$ sh 2b.sh kanasu

You have not entered a valid username

Output3:

[reddy@localhost kanasu]$ sh 2b.sh reddy

reddy:x:500:500:Hanumantha Reddy:/home/reddy:/bin/bash

The valid username is :/home/reddy



3a. Create a script file called file-properties that reads a file name entered

and outputs its properties.

SOURCE CODE

echo "Enter a file:"

read f1

if [ ! -e $f1 ];then

echo "File not exist"

exit

else

a=`ls -l $f1 | cut -d " " -f1`

b=`ls -l $f1 | cut -d " " -f2`

c=`ls -l $f1 | cut -d " " -f3`

d=`ls -l $f1 | cut -d " " -f4`

e=`ls -l $f1 | cut -d " " -f5`

f=`ls -l $f1 | cut -d " " -f 6-8`

g=`ls -l $f1 | cut -d " " -f9`

echo "File permissions are:$a"

echo "File link number is/are:$b"

echo "File owner is:$c"

echo "File group owner is:$d"

echo "File size is:$e"

echo "File modification date is:$f"

echo "File name is:$g"

fi



Output1:


Enter a file:

file1

File permissions are:-rw-rw-r--.

File link number is/are:1

File owner is:reddy

File group owner is:reddy

File size is:49

File modification date is:Dec 25 14:59

File name is:file1

Output2:


Enter a file:

output1

File not exist



3b. Write shell script to implement terminal locking (similar to the lock

command). It should prompt the user for a password. After accepting the

password entered by the user , it must prompt again for the matching

password for confirmation and if match occurs, it must lock the keyword

until a matching password is entered again by the user , Note that the

script must be written to disregard BREAK, control-D. No time limit need

be implemented for the lock duration.

SOURCE CODE

stty -echo

echo "Enter the Password:"

read pass1

echo "Confirm the Password:"

read pass2

if [ $pass1 == $pass2 ];then

echo "The terminal is locked"

while true

do

echo "Enter the Password:"

read pass3

if [ $pass3 == $pass2 ];then

echo "The terminal is Unlocked"

stty echo

exit

else

echo "Try again with correct Password"

fi

done



else

echo "Both the passwords are not matching"

fi



Output1:


Enter the Password:

Confirm the Password:

The terminal is locked

Enter the Password:

The terminal is Unlocked

Output2:


Enter the Password:


The terminal is locked

Enter the Password:

Try again with correct Password

Enter the Password:

The terminal is Unlocked

Output3:


Enter the Password:


Both the passwords are not matching



4a. Write a shell script that accept one or more filenames as argument and

convert them to uppercase, provided they exist in current directory.

SOURCE CODE


echo "No arguments passed in command line"

exit

else

for arg in $*

do

if [ -f $arg ];then

newfile=`echo $arg | tr "[a-z]" "[A-Z]"`

if [ -f $newfile ];then

echo "$arg file already existS"

else

echo "$arg converted into uppercase as:$newfile"

fi

else

echo "$arg file does not exists"

fi

done

fi



Output1:


No arguments passed in command line

Output2:


file1 converted into uppercase as:FILE1


Output3:

[reddy@localhost kanasu]$ sh 4a.sh file1 file2 file3 file4







4b. Write a shell script that displays all the links to a file specified as the

first argument to the script. The second argument, which is optional, can

be used to specify in which the search is to begin. If this second is not

present, the search is to begin in current working directory. IN either case,

the starting directory as well as all its subdirectories at all levels must be

searched. The script need not include any error checking.

SOURCE CODE

if [ $# -eq 2 ]

then

if [ -d $2 ]

then

cd $2

n=0

x=`ls -il $1|cut -d " " -f1`

for link in `find . -inum $x`

do

echo "$link"

((n=n+1))

done

else

echo "$2 is not a directory"

fi

echo "In `pwd` directory the number of links $n"

elif [ $# -eq 1 ]

then

n=0

x=`ls -il $1|cut -d " " -f1`



for link in `find . -inum $x`

do

echo "$link"

done

fi



Output1:

[reddy@localhost kanasu]$ sh 4b.sh file1

./file1

Output2:

[reddy@localhost kanasu]$ ln file1 temp

[reddy@localhost kanasu]$ sh 4b.sh file1

./file1

./temp



5a. Write a shell script that accepts as filename as argument and display its

creation time if file exist and if it does not send output error message.

SOURCE CODE


echo "No arguments passed"

exit

fi

if [ ! -e $1 ];then

echo "File does not exists"

exit

else

x=`ls -lu $1 | cut -d " " -f 5-8`

echo "File creation time is:$x"

fi



Output1:


No arguments passed

Output2:

[reddy@localhost kanasu]$ sh 5a.sh file6

File does not exists

Output3:


File creation time is:49 Dec 25 15:38



5b. Write a shell script to display the calendar for current month with

current date replaced by * or ** depending on whether the date has one

digit or two digits.

SOURCE CODE

a=`date +%e`

if [ $a -lt 10 ];then

cal | sed "s/$a/*/"

else

cal | sed "s/$a/**/"

fi



Output1:


December 2013

Su Mo Tu We Th Fr Sa

1 2 3 4 5 6 7

8 9 10 11 12 13 **

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31

Output2:


December 2013

Su Mo Tu We Th Fr Sa

1 2 3 4 5 6 7

* 9 10 11 12 13 14

15 16 17 18 19 20 21

22 23 24 25 26 27 28

29 30 31



6a. Write a shell script to find a file/s that matches a pattern given as command line argument in the home directory, display the contents of the file and copy the file into the directory ~/mydir

SOURCE CODE

d=`ls -x $* | tr -s " " " "`

echo " The Contents of file are "

for x in $d

do

cat $x

cp $x ~/mydir

echo " $x Copied "

done



Output:

[reddy@localhost kanasu]$ sh 6a.sh reddy reddy1

The Contents of file are

i am from belgaum

reddy Copied

i am hanumantha reddy

reddy1 Copied

[reddy@localhost kanasu]$ vi reddy

[reddy@localhost kanasu]$ vi reddy1



6b. Write a shell script to list all the files in a directory whose filename is at

least 10 characters.(use expr command to check the length).

SOURCE CODE

for x in ‘ls’

do

len=`expr length $x`

if [ $len –ge 10 ] ; then

echo “ expr length $x “ $x

fi

done



Output1:


No arguments in command line

Output2:


File exist:file1

Content of the copied file are

Reddy

Manjunath

Output3:


File does not exists



7a. Write a shell script that gets executed displays the message either

“Good Morning” or “Good Afternoon” or “Good Evening” depending

upon time at which the user logs in.

SOURCE CODE

time=`who am I | tr -s ‘ ‘ | cut -d ” ” -f 4 | cut -c 1,2`

if [ $time -le 12 ] ; then

echo “Good Morning $LOGNAME”

elif [ $time -gt 12 -a $time -lt 16 ] ; then

echo “Good Afternoon $LOGNAME”

else

echo “Good Evenini $LOGNAME”

fi

Output1:


“Good Evenining reddy”



7b. Write a shell script that accept a list of filenames as its argument, count and reportOccurrence of each word that is present in the first argument file on other argument Files.

SOURCE CODE

if [ $# -lt 2 ]

then

echo "Invalid number of arguments.Enter atleast two arguments"

exit

fi

str=` cat $1 | tr '\n' ' ' `

set $*

shift

for i in $*

do

echo "file name" $i

echo "---------"

for a in $str

do

echo "word=$a", count=` grep -c "$a" $i `

done

done



Output1:

[reddy@localhost kanasu]$ sh 7b.sh aa bb

file name bb

---------

word=a, count=2

word=b, count=2

word=c, count=2

word=d, count=2

word=a, count=2

word=b, count=2

word=c, count=2

word=d, count=2

Output2:

[reddy@localhost kanasu]$ sh 7b.sh x x1

file name x1

---------

word=a, count=1

word=b, count=1

word=c, count=1

word=d, count=1



8a. Write a shell script that determine the period for which a specified user is working on system and display appropriate message.

SOURCE CODE

echo "Enter Login name of the user"

read name

# get name and timing of logged in user from who cmd

userinfo=`who | grep -i "$name" | grep "pts"`

if [ $? -ne 0 ];

then

echo "$name is not Logged in"

exit

fi

hrs=ècho "$userinfo" | tr -s " " | cut -c ‘24-25’`

min=ècho "$userinfo" | tr -s " " | cut -c ‘27-28’`

curhr=`date | tr -s " " | cut -c 12-13` #get current time(hrs)

curmin=`date | tr -s " " | cut -c 15-16` #get Cur time(min)

hour=èxpr $curhr - $hrs`

minutes=èxpr $curmin - $min`

echo "$name is working since $hour hours and $minutes minutes"



Output1:


Enter Login name of the user

reddy

reddy is working since 2 hours and 17 minutes

Output2:


Enter Login name of the user

reddy

reddy is working since 2 hours and 19 minutes



8b. Write a shell script that reports the logging in of a specified user within one minute after he/she log in. The script automatically terminate if specified user does not log in during a specified period of time.

SOURCE CODE

echo "enter the login name of the user"read nameperiod=0until who | grep -w "$name"dosleep 5 #Pause the script for 5 secperiod=èxpr $period + 1ìf [ $period -gt 1 ];thenecho "$name has not login since 1 minute"exitfidoneecho "$name has now logged in "echo "enter the login name of the user"read nameperiod=0

until who | grep -w "$name"dosleep 5 #Pause the script for 5 secperiod=èxpr $period + 1`

if [ $period -gt 1 ];thenecho "$name has not login since 1 minute"exitfidoneecho "$name has now logged in "



Output1:[reddy@localhost kanasu]$ sh 8b.sh

enter the login name of the user

reddy

reddy tty1 2013-12-26 19:32 (:0)

reddy pts/0 2013-12-26 19:33 (:0.0)

reddy has now logged in

enter the login name of the user

reddy

reddy tty1 2013-12-26 19:32 (:0)

reddy pts/0 2013-12-26 19:33 (:0.0)

reddy has now logged in

Output2:[reddy@localhost kanasu]$ sh 8b.shenter the login name of the userabcdabcd has not login since 1 minute



9a. Write a shell script that accepts the file name, starting and ending line number as an argument and display all the lines between the given line number.

SOURCECODE

if [ $# -lt 3 ]

then

echo "The number of arguments in command line is less than 3"

echo -e "Enter three arguments in the form of 'filename startline endline'\n"

exit

else

sed -n "$2,$3p" $1

echo "This is the section between lines $2 to $3 of the file:$1"

fi



Output1:

[reddy@localhost kanasu]$ sh 9a.sh repeat 1 4

eat

sat

ran

sat

This is the section between lines 1 to 4 of the file:repeat

Output2:

[reddy@localhost kanasu]$ sh 9a.sh repeat 1 4

The number of arguments in command line is less than 3

Enter three arguments in the form of 'filename startline endline'



9b. Write a shell script that folds long lines into 40 columns. Thus any line

that exceeds 40 characters must be broken after 40th, a "\" is to be

appended as the indication of folding and the processing is to be continued

with the residue. The input is to be supplied through a text file created by

the user.

SOURCECODE

echo "Input Filename"

read file

if [ ! -f $file ];then

echo "File not exists"

exit

fi

for ((i=1;i<8;i++))

do

x=`sed -n "$i"p $file | wc -c`

if [ $x -gt 40 ]; then

z=`sed -n "$i"p $file | fold -w 40`

echo "$z\\"

else

a=`sed -n "$i"p $file`

echo "$a"

fi

done



Output1:


Input Filename

aa

a

b

c

d

a

b

c

[reddy@localhost kanasu]$ cat aa

a

b

c

d

a

b

c

d



10a. Write an awk script that accepts date argument in the form of dd-mm-

yy and displays it in the form if month, day and year. The script should

check the validity of the argument and in the case of error, display a

suitable message.

SOURCECODE

BEGIN {

printf("enter date in the form(mm-dd-yy) : ")

getline str < "/dev/tty"

split(str,arr,"-")

if(arr[1]<=0||arr[1]>12)

printf("\n Invalid Month\n ")

else

if(arr[2]<=0 || arr[2]>31)

printf("\n Invalid date\n ")

else

system(" date +%A%t%B%t%Y -d" arr[3] "-" arr[1] "-" arr[2])

}



Output1:

[reddy@localhost kanasu]$ awk -f 10a.awk

enter date in the form(mm-dd-yy) : 12-12-2013

Thursday December 2013

Output2:

[reddy@localhost kanasu]$ awk -f 10a.awk

enter date in the form(mm-dd-yy) : 06-22-1992

Monday June 1992



10b. Write an awk script to delete duplicated line from a text file. The order of the original lines must remain unchanged.

SOURCE CODE

BEGIN {

print "Program Start"

}

{

if (data[$0]++==0)

lines[++count]=$0

}

END {

for ( i=1; i<count; i++)

print lines[i]

print "Program End"

}



Output1:

[reddy@localhost kanasu]$ awk -f 10b.awk aa

Program Start

a

b

c

Program End

Output2:

[reddy@localhost kanasu]$ awk -f 10b.awk bb

Program Start

a

b

c

d

e

f

Program End



11a. Write an awk script to find out total number of books sold in each discipline as well as total book sold using associate array down table as given below.

Electrical 34

Mechanical 67

Electrical 80

Computer Science 43

Mechanical 65

Civil 98

Computer Science 64

SOURCE CODE

BEGIN {

fs=" "

printf "The student book details are"

}

{

tot+=$2

books[$1]=books[$1]+$2

}

END

{

printf "\n Sub name \t no. of books sold \n"

for (i in books)

printf "%s \t %d \n" , i , books[i]

printf "Total books sold=%d\n" , tot }



Output1:

[reddy@localhost kanasu]$ awk -f 11a.awk book_details

The student book details are

Sub name no. of books sold

Civil 98

Computer_Science 107

Mechanical 132

Electrical 114

Total books sold=451



11b. Write an awk script to compute gross salary of an employee accordingly to rule given below.

If basic salary is < 10000 then HRA=15% of basic & DA=45% of basic

If basic salary is>=10000 then HRA=20% of basic & DA=50% of basic

SOURCE CODE

BEGIN {

print "\n\t Salary statement of Employees for the month of May 2008\n"

print "Sl.No.","NAME","\t\t","Designation","\t","Basic","\t","DA","\t","HRA","\t","Gross"

slno=1

}

{

if( $5 > 10000)

{

da=0.45*$5

hra=0.15*$5

}

else

{

da=0.50*$5

hra=0.20*$5



}

printf("%2d\t%-15s%-12s%8d %8.2f %8.2f% 8.2f\n",slno++,$2,$3,$5,da,hra,$5+hra+da)

}

END {

printf ("\nProgram End\n")

}



Output1:

[reddy@localhost kanasu]$ cat > emp.lst

1 John SoftwareEngineer 12-09-1985 20000

2 Mike HardwareEngineer 03-11-1993 18000

3 Rahul Mechanical 11-12-2011 13000

[reddy@localhost kanasu]$ awk -f 11b.awk emp.lst

Salary statement of Employees for the month of May 2008

Sl.No. NAME Designation Basic DA HRA Gross

1 John SoftwareEngineer 20000 9000.00 3000.00 32000.00

2 Mike Hardware Engineer 18000 8100.00 2700.00 28800.00

3 Rahul Mechanical 13000 5850.00 1950.00 20800.00

Program End


usn: subjectcode:13mca17hanumanthareddygn.weebly.com/uploads/3/8/6/9/3869… · web view1a. write a...

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