unix lab file

7/27/2019 Unix Lab File

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1. Write a Shell Script which creates the following menu and prompts for choicefrom user and runs the chosen command.

a. Today's date

b. Process of user

c. List of files

d. Quit to UNIX

echo Enter your Choiceecho 1. Dateecho 2. Process of Userecho 3. List of Files

echo 4. Exitread chcase "$ch" in1)date ;;2)PS ;;3)LS ;;4)exit ;;*) echo invalid Choiceesac


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2. Write a Shell Script which will redirect the output of the date commandwithout the time into a file.

echo Enter the file nameread filea= `date|cut -b1-11, 25-28`echo $ a|tee -a $fileecho "\n" $file successfully created

echo "\n" "content of file is:" `cat $file`


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3. Write a Shell Script that accepts a filename as a command line argumentand finds out if its a regular file or a directory. If its a regular file, thenperforms various tests to see if it is readable, writeable, executable etc.

if [ -d $1 ] ; thenecho "It is a Directory"fiif [ -f $1 ] ; thenecho "It is a File"fi

if [ ! -r $1 ] ; thenecho "File is not readable"elseecho "File is Readable"fi

if [ -w $1 ] ; thenecho "File is Writable"elseecho "File is not Writable"

fi

if [ -x $1 ] ; thenecho "File is Executable"elseecho "File Is not Executable"fi


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4. Write a Shell Script that computes the factorial of a given number

echo "Enter any no for Factorial"read noa=$noi=1;while test $no -ge 1doi=`expr $i \* $no`no=`expr $no - 1`doneecho "Factorial of " $a " is "$i


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5. Write a Shell Script that works like a calendar reminding the user ofcertain things depending on the day of the week.

a=`date +%A`echo "\n" Today is $aecho Your tasks for today is as followscase $a inMonday) echo Come late in class;;Tuesday) echo Just two lectures and then masti;;Wednesday) echo Boring Lectures;;Thursday) echo Yupiiieeee Foriegn Language Lecture

;;Friday) echo Last Working Day;;Saturday) echo Movie;;Sunday) echo Sleeping;;Esac


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6. Write a Shell Script which takes a command line argument of Kms and bydefault converts that number into meters. Also provide options to convertkm to dm and km to cm.

echo "Enter kms"read noa=$noi=1p=1000i=èxpr $a \* $pècho "In meters = " $iecho "Enter choice for operation 1 for dm or 2 for cm"read op

case $op in

1)c=èxpr $a \* 10000ècho "In dm" $c;;

2)d=èxpr $a \* 100000ècho "In cm" $d;;

esac


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7. Write a Shell Script that performs a count-down either from 10 (default) orfrom the value that is entered by the user.

a=10while test $a -ge 1doecho $asleep 5a=`expr $a - 1`done


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8. If a number is input through the keyboard, WASS to calculate sum of itsdigits.

echo "Enter the number ="read noa=$noe=0while test $a -ge 1dor=èxpr $a \% 10à=èxpr $a \/ 10è=èxpr $e + $r`doneecho $e


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9. Write a Shell Script using for loop, which displays the message "Welcometo the UNIX System"

Echo displayin a messageFor((i=0;i


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10.WAP to calculate and print the first m Fibonacci numbers.

echo "Enter any no"read no

n1=-1n2=1i=1echo "The fibonacci series is"while test $i -le $nodon3=èxpr $n1 + $n2ècho $n3n1=$n2n2=$n3i=èxpr $i + 1`

done


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11.WASS to compute the GCD and LCM of two numbers.

echo "Enter the first number :"read a

echo "Enter the second number : "read b

if [ $a -gt $b ]thennum=$aden=$belsenum=$bden=$afi

r=èxpr $num % $den`

while [ $r -ne 0 ]donum=$denden=$rr=èxpr $num % $den`done

gcd=$denlcm=èxpr $a \* $b / $gcd`

echo " The LCM of $a and $b is : $lcm"echo " The GCD of $a and $b is : $gcd"


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12.Two numbers are entered through the keyboard. WAP to find the value ofone number raised to the power of another.

Echo "Enter the no."read no

echo "Enter it's power"read pwi=1c=1while test $i -le $pwdoc=èxpr $c \* $noì=èxpr $i + 1`doneecho "the power "$pw" of "$no" is "$c


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13.WAP to generate all combinations of 1, 2 and 3 using for loop.

for i in 1 2 3dofor j in 1 2 3

dofor k in 1 2 3doecho $i$j$kdonedonedone


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14.WASS that repeatedly asks the user repeatedly for the Name of theInstitution until the user gives the correct answer.

echo "Name of the Instituition"read str

if test $str = aiitthenecho "Name of instituition is aiit"elseecho "Wrong name"fi


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15.Write a Shell Script that changes the extension of a group of files from txtto doc

for file in *.txtdoleftname=`basename $file txt`mv $file ${leftname}docdone


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16. Write a Shell Script that receives two filenames as arguments. It shouldcheck whether content of the two files is same or not. If they are same,second file should be deleted

if [ -f $1 -a -f $2 ]thenif diff $1 $2thencat $1echo "\n"cat $2echo contents are same, second file is being deletedrm $2elseecho contents are different

fielseecho "file does not exist"fi


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17.Write a Shell Script (using while loop) to execute endlessly (untilterminated by user) a loop which displays contents of current directory,disk space status, sleep for 30 seconds and display the users currentlylogged in on the screen.

char=ywhile [ $char="y" ]dolsdf -hsleep 2echo "want to continue ?"read chardone


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18.Write a Shell Script to change the filename of all files in a directory fromlower-case to upper-case.

for i in *domv $i `echo $i|tr "[:lower:]" "[:upper:]"`done


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19.Write a Shell Script that examines each file in the current directory. Fileswhose names end in old are moved to a directory named old files and fileswhose names end in .c are moved to directory named cprograms.

for i in *.olddomv $i oldfilesdone

for i in *.cdomv $i cprogramsdone

Ques: Write a Shell Script which searches all files in the given directory (to be taken as


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command line argument) for the file having the title (to be taken as command line

argument), as the first line in the file and display the contents of the searched file and

then, print the size, where

File is small-sized if total no. of lines is


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Ques: Write a shell script which reports names and sizes of all files in a directory

(directory would be supplied as an argument to the shell script) whose size is exceeding

1000 bytes. The filenames should be printed in descending order of their sizes. The

total number of such files should also be reported

Code:if [ ! -d $1 ]thenecho "'$1' is not a directory..."

elif [ `expr $#` -eq 0 ]thenecho "ERROR...! (no arguements passed)"

elseecho ":::::FILES (exceeding 1000):::::"

echo " "cd $1ls -l|grep [1-9][0-9][0-9][0-9].|cut -d " " -f 5,9|sort -g -r

echo "----- ------------"echo "TOTAL= `ls -l|grep -c [1-9][0-9][0-9][0-9]. "

fi


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Ques: Write a Shell Script for renaming each file in the directory such that it will have

the current shell PID as an extension. The shell script should ensure that the

directories do not get renamed...

Code:

echo "Enter Directory- "read DIR

if [ ! -d $DIR ]thenecho "$DIR is not a directory..."

elsecd $DIR

echo ":::::CONTENTS OF $DIR:::::"

ls -l

for i in *doif [ -f $i ]thenmv $i $i.`echo $$`fidone

echo ":::::CONTENTS OF $DIR (new):::::"ls -l

fi


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Ques: Write a Shell Script that will receive any number of filenames as arguments.

The shell script should check whether such files already exist. If they do, then it should

be reported. The files that do not exist should be created in a sub-directory called

mydir. The shell script should first check whether the sub-directory mydir exists in the

current directory. If it doesnt exist, then it should be created. If mydir already exists,then it should be reported along with the number of files that are currently present in

mydir.

Code:

for i in $*doif [ -e $i ]then

if [ -f $i ]

thenecho "'$i' exists...(file)"elif [ -d $i ]thenecho "'$i' exists...(directory)"fi

elseecho "'$i' doesnot exists..."echo File created: `date| cut -c 1-10,20-28` > $iecho "'$i' created..."

if [ ! -e MYDIR ]thenecho 'MYDIR' doesnot exist...mkdir MYDIRecho Created 'MYDIR'...fimv $i /home/aman/MYDIR/$iecho "'$i' moved to MYDIR..."fi

done


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Ques: Write a shell script receives even number of filenames. Suppose four filenames

are supplied, then the first file should get copied into second file, the third file should

get copied into fourth and so on. If odd number of filenames is supplied then no

copying should take place and an error message should be displayed

Code:if [ èxpr $# % 2` -ne 0 ]thenecho "ERROR...! (odd number of files passed)"

elif [ èxpr $#` -eq 0 ]thenecho "ERROR...! (no files passed)"

elsecount=0

for i in $*docount=èxpr $count + 1`

if [ $count -eq 1 ]thenfile1=$ifi

if [ $count -eq 2 ]thenfile2=$iecho $file1 copied to $file2cp $file1 $file2count=0fi

donefi


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Ques: Write a shell script to identify all zero-byte files in the current directory and

delete them. Before proceeding with deletion, the shell script should get a confirmation

from the user

Code:echo ALL FILESls

for i in *doif [ -f $i -a ! -s $i ]thenrm -i $ifi

done

echo "ALL FILES (empty files removed)"l

s


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Ques: Write a shell script that prompts the user for the password. The user has

maximum of 3 attempts. If the user enters the correct password, the message Correct

Password is displayed else the message Wrong Password

Code:

count=1

while [ $count -le 3 ]doecho Enter Password-read pass

if [ $pass == "ak727" ]thenecho CORRECT PASSWORD...exit

elseif [ èxpr 3 - $count` == 0 ]thenecho "WRONG PASSWORD (No more attempt available)..."exitfi

echo "WRONG PASSWORD (èxpr 3 - $count` attemp(s) left)..."count=èxpr $count + 1`fi

done


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Ques: Write a Shell Script that takes a search string and filename from the terminal &

displays the results

Code:

echo "Enter file- "read FILE

echo "Enter Pattern (to search)- "read ch

if [ ! -f $FILE ]thenecho "'$FILE' is not a file..."

elseif [ `grep -c $ch $FILE` -gt 0 ]then

echo "Pattern '$ch' is found in '$FILE' '`grep -c $ch $FILE` time(s) ' "fifi


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Ques: Write a Shell Script that takes pattern and filename as command line arguments

and displays the results appropriately i.e. pattern found/pattern not found

Code:

if [ `expr $#` -eq 0 ]then

echo "ERROR...! (no arguments passed)"

elif [ `expr $#` -eq 1 ]thenecho "ERROR...! (file no passed)"

else

if [ ! -f $2 ]thenecho "'$2' is not a file..."

elseif [ `grep -c $1 $2` -gt 0 ]thenecho "Pattern '$1' is found in '$2' '`grep -c $1 $2` time(s)' "fifi

fi


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Ques: Write a Shell Script that accepts only three arguments from the command line.

The first argument is the pattern string, the second argument is the filename in which

the pattern is to be searches and the third argument is the filename in which the resultis to be stored. Write a Shell Script that accepts both filename and a set of patterns as

positional parameters to a script...

Code:

if [ `expr $#` -gt 3 ]thenecho "ERROR...! (extra arguments passed)"

elif [ `expr $#` -lt 3 ]then

echo "ERROR...! (Required argument(s) not passed)"

elseif [ ! -f $2 ]thenecho "'$2' is not a file..."if [ ! -f $3 ]thenecho "'$3' is also not a file..."fi

elif [ ! -f $3 ]thenecho "'$3' is not a file..."

elseif [ `grep -c $1 $2` -gt 0 ]thenecho "Pattern '$1' is found in '$2' '`grep -c $1 $2` time(s)'" > $3elseecho "Pattern '$1' is not found in '$2'" > $3fifi

fi


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