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UNIX PROGRAMS & LOOPS

UNIX PROGRAMS & LOOPS. #QUE:1 WRITE A UNIX SHELL SCRIPT TO #DISPLAY THE TYPE OF SHELL THAT ARE #CURRENTLY# LOGGED IN USER IS USING.IT #SHOULD DISPLAY THE MESSAGE AS BELOW. # <TYBCA - SEM 5> echo $"user name:" $LOGNAME echo $"Shell:" $SHELL.

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UNIX PROGRAMS & LOOPS

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  1. UNIX PROGRAMS & LOOPS

  2. #QUE:1 WRITE A UNIX SHELL SCRIPT TO #DISPLAY THE TYPE OF SHELL THAT ARE #CURRENTLY# LOGGED IN USER IS USING.IT #SHOULD DISPLAY THE MESSAGE AS BELOW. # <TYBCA - SEM 5> echo $"user name:" $LOGNAME echo $"Shell:" $SHELL

  3. #QUE:2 WRITE A UNIX SHELL SCRIPT TO ACCEPT THE EMPLOYEE NAME FROM THE USER AND DISPLAY APPROPRIATE MESSAGE.ASSUME EMPLOYEE IS WORKING #ON A SINGLE PROJECT DETAILS ARE STORED IN FILE THE EMPLOYEE ARE #STORE IN FILE STATUS.DAT.# <TYBCA - SEM 5> echo -e "Enter Name of the employee:\c" read name ecd=0 rm=0 if ecd=`grep "$name" project.dat | cut -d "|" -f 1` then dw=`grep "$ecd" struct.dat | cut -d "|" -f 3` du=`grep "$ecd" project.dat | cut -d "|" -f 4` else echo -e "===Name Not Found===\n" fi if [ $dw -eq $du ] ; then echo "$name,Today is the last day to finished your project" else rm=`expr $du - $dw` if [ $rm -le 30 ] ; then echo "$name,Hurry! only $rm days are remaining to finish your project" else echo "$name,schedule yourself you have still $rm days to finish the job" fi fi

  4. #QUE:3 WRITE A UNIX SHELL SCRIPT WHICH TAKES I/P A FILENAME AND CHECKS IT TO SEE # IF IT IS A ORDINARY FILE AND READABLE, IT CONTAINS SHOULD BE DISPLAYED. # <TYBCA - SEM 5># echo -e "Enter the file name: \c" read fname if [ -f $fname ] then if [ -$fname ] then cat $fname fi fi

  5. #QUE:4 WRITE A UNIX SHELL SCRIPT TO FIND THE SUM OF FIRST N NUMBERS WHERE N IS # ACCEPTED FROM USER. # e.g 1+2+3...+n # <TYBCA - SEM 5> # echo -e "Enter the value of n: \c" read n sum=0 i=1 while [ $i -le $n ] do sum=`expr $sum + $i` i=`expr $i + 1` done echo The sum is: $sum

  6. QUE:5 WRITE A UNIX SHELL SCRIPT TO ACCEPT MARKS OF MATH,SCI,ENG AND CALCULATE # THE AVG OF MARKS AND DISPLAY THE MESSAGE. # <TYBCA - SEM 5> echo "Enter the marks of maths:" read m echo "Enter the marks of science:" read s echo "Enter the marks of english:" read e (( avg=($m+$s+$e)/3 )) if [ $avg -gt 60 ]; then echo "FIRST CLASS" elif [ $avg -gt 50 ] && [ $avg -lt 60 ] then echo "SECOND CLASS" elif [ $avg -gt 40 ] && [ $avg -lt 50 ] then echo "THIRD CLASS" else echo "FAIL" fi

  7. #QUE:7 WRITE A UNIX SHELL SCRIPT WHICH PRINTS THE FOLLOWING: # A)THE MESSAGE "TODAY IS:" WITH CURRENT DATE IN MM/DD/YY FORMAT. # B)THE MESSAGE "NO OF USERS LOGGED IN:" WITH TOTAL NO OF CURRENT # LOGGED IN USERS. # C)THE MESSAGE "PERSONAL STATUS:" WITH YOU OWN LOGNAME,TERMINAL NUMBER, # DATA AND TIME OF LOGIN. # echo -e "Todays Date: \c" date +"%D" echo " " echo -e "NO. of user currently logged on: \c" who | wc -l echo " " echo -e "Personal information" who am i -H echo " "

  8. #QUE:8 WRITE A UNIX SHELL SCRIPT THAT EXAMINES ALL THE NUMBERS FROM 1 TO 199 # DISPLAYING ALL THOSE WHICH THE SUM OF THE CUBES OF THE DIGITS EQUALS # THE NUMBER ITSELT. # <TYBCA - SEM 5> echo The List of the digits. i=1 while [ $i -le 999 ] do no=$i sum=0 while [ $no -gt 0 ] do (( j = no%10 )) (( sum = sum + (j * j * j))) ((no = no / 10)) done if [ $sum -eq $i ] then echo " " echo $i fi ((i = i + 1)) done

  9. #QUE:9 WRITE A UNIX SHELL SCRIPT TO ACCEPT THE SALESMAN CODE FROM USER AND THEN # DISPLAY ALL THE ORDER NUMBERS AND ORDER AMT FOR THAT SALESMAN CODE. ALSO # DISPLAY THE TOTAL ORDER AMT # <TYBCA - SEM 5> echo -e "Enter salesman code: \c" read scode sum=0 echo Order no Order amount grep "$scode" sales.dat | cut -f2,3 for i in `grep "$scode" sales.dat | cut -f3` do (( sum = sum + i)) done echo -e "\nTotal amount: \c" echo $sum

  10. #QUE:11 WRITE A UNIX SHELL TO ADD RECORDS TO A FILE CALLED MATERIAL.DAT #THE FIELD USING MATCODE,QTY,SOLD AND RATE. # <TYBCA - SEM 5> mcode=`tail -1 mat.dat | cut -d"|" -f1` echo -e "\nEnter the quntity of sold item: \c" read qty echo -e "\nEnter the amount: \c" read amt if [ $qty -lt 1 ] ; then echo -e "\nQuantity should be greater then 0" fi if [ $amt -le 100 -o $amt -gt 10000 ] then echo -e "\nAmount must between 100 and 10000" fi (( mcode = mcode + 1 )) echo "$mcode | $qty | $amt" >> mat.dat

  11. #QUE:12 WRITE A UNIX SHELL SCRIPT WHICH ACCEPTS A CHOICE FOR THE USER AND # EXECUTE THE CORRESPONDING PROGRAMS USING CASE STRUCTURE. ASSUMING # THE PROGRAM AS (ADD,MODIGY & DELETE) ALREADY EXITS THE FORMAT OF THE # MENU IS # A -> ADDITION # M -> MODIFICATION FO RECORDS # D -> DELETION OF RECORDS # Q -> QUIT # <TYBCA - SEM 5> echo 1. Addition of record echo 2. Modify a record echo 3. Deletion of record echo 4. Quit echo -e "Enter your choice: \c" read ch cat mat.dat case "$ch" in A) mcode=`tail -1 mat.dat | cut -d"|" -f1` echo -e "\nEnter the quntity of sold item: \c" read qty echo -e "\nEnter the amount: \c" read amt (( code = mcode + 1 )) echo "$code | $qty | $amt" >> mat.dat;;

  12. M) echo -e "\nWhich record u want to change?: \c" read r echo -e "\nEnter new quantity: \c" read nqty echo -e "\nEnter new rate: \c" read nrate sed ''$r' c\ $r' | '$nqty' | '$nrate'' mat.dat >ext cat ext > mat.dat;; D) echo -e "Enter record no: \c" read rn echo -e "Are you sure to delete this record?(Y or N): \c" read cho if [ $cho = 'Y' ] then sed ''$rn' d' mat.dat >ext fi;; Q)esac

  13. echo -e "ENTER BOOK NAME:" read bname grep "$bname" book.dat

  14. #QUE:14 WRITE A SHELL PROGRAM EHICH WILL WORK LIKE COMMAND WC. # <TYBCA - SEM 5> # rd=0 terminal=/dev/pts/0 exec<$1 while read line do (( ln = ln + 1 )) set $line (( word = word + $# )) done echo "Total no. of lines: $ln" echo "Total no of words: $word" exec<$terminal

  15. #QUE:16 WRITE A SHELL SCRIPTS TO COUNT NUMBER OF VOWELS IN FILE #IIGNORING THE CASE. # <TYBCA - SEM 5> # echo -e "Enter a file name: \c" read fname tot=`wc -c < $fname` count=0 while [ $tot -gt 0 ] do for ch in `cut -c $tot < $fname` do case $ch in a|A)(( count = count + 1 ));; e|E)(( count = count + 1 ));; i|I)(( count = count + 1 ));; o|O)(( count = count + 1 ));; u|U)(( count = count + 1 ));; esac done (( tot = tot - 1 )) done

  16. QUE:17 WRITE A SHELL SCRIPTS TO GENERATE RANDOM NUMBER.ALLOW USER TO GUESS 6 # TIMES TO GET THE NO.PRINT APPROPRIATE MESSAGES AGTER EACH GUESS # RANDOM GENERATED IS 100 USERS ENTERS 98 MESG: TO SMALL # USER ENTERS 104 THE MESG TO BIG# <TYBCA - SEM 5> ctr=0 while true do s=`date "+%S"` m=`date "+%M"` let rn=s\*m let ctr=ctr+1 echo -e "Enter your guess \c" read gu echo "Random Generated Is: $rn" if [ $gu -gt $rn ] ; then echo "Too Big" elif [ $gu -lt $rn ] ; then echo "Too Small" else echo "Equals" fi if [ $ctr -eq 5 ] ; then exit fi done

  17. # To Remove Directory and its subdirectory when user enters the name of # directory echo "Enter name of directory" read dname echo "This Will remove $dname and all the subdirectories below it" echo -e "Enter y/n :\c" read ch if [ $ch == "n" -o $ch == "N" -o -z $dname ] ; then exit 1 fi cd $dname while true ; do for i in `ls` ; do if [ -d $i ] ; then dir="true" dn=$i break; else dir="false" fi done

  18. if [ $dir == "true" ] ; then cd $dn else for i in `ls` ; do rm $i done ds=`pwd` dn=${ds##*/} cd .. rmdir $dn fi if [ $dn == $dname ] ; then break fi done

  19. QUE:19 WRITE A UNIX SELL SCRIPT THAT TAKES A LOGIN AS A COMMAND LING #ARGUMENT AND REPORTS TO YOU WHEN THAT PERSON LOGS IN.HAVE IS SEND #A GREETING TO THAT PERSONS EXPLAIN WHO WOULD YOU RUN SUCH A SHELL #SCRIPT. <TYBCA - SEM 5> if [ $ -lt 1 ] then echo -e "\nPlz. enter the username as command line argument" exit fi lname=$1 while true do who | grep "$lname" > /dev/null if [ $?=0 ] then echo -e "\n$lname is logged in" echo -e "\n$lname logged in time: \c" date "+%I":"%M" echo "Welcome to the world of unix" | write $lname exit else sleep 60 fi done

  20. #QUE:20 WRITE A SHELL SCRIPT THAT TAKES A COMMAND LINE I/P N AND A WORD. IT # THEN PRINTS THE WORD N TIMES,ONE WORD PER LINE. # <TYBCA - SEM 5> i=0 while [ $i -lt $1 ] do echo $2 (( $i = $i + 1 )) done

  21. #QUE:21 WRITE A PROGRAM TO DISPLAY DATE IN DIFFERENT FORMAT ALONG WITH TIME. # <TYBCA - SEM 5> # <ROLLNO - 27> echo Today date and time in different format as foloows... echo date "+%A, %B %d, %Y, %I:%M:%S" echo date "+%d/%m/%y, %H:%M:%S" echo date "+%a, %b, %d, %H:%M:%S, %p" echo date "+%D, %T" echo

  22. #QUE:22 WRITE A UNIX SHELL SCRIPT TO FIND SUM OF DIGIT AND CHECK THE NUMBER IS PALINDROM OR NOT. <TYBCA - SEM 5> echo -e "Enter positive no: \c" read no if [ "$no" -le "0" ] then echo Plz. Enter a positive no exit fi sum=0 count=0 base=1 (( no1 = no )) while [ "$no" -gt "0" ] do (( sum = sum + (no % 10) )) (( no = no / 10 )) (( count = count + 1 )) (( base = base * 10 )) done lin=0

  23. k=0 (( no2 = no1 )) (( i = i + 1 )) echo -e "\nThe sum of digit is: $sum" if [ test $no2 -eq $palin ] then echo -e "\nThe number is Palindrome" else echo -e "\nThe number is not Palindrome" fi

  24. #QUE:41 WRITE A SHELL SCRIPT TO ACCEPT THE NAME OF THE USER AS #INPUT AND CHECK # OUT WHETHER THAT USER HAS LOG IN OR NOT. # <TYBCA SEM 5> echo " enter the login name...:" read ln finger | cut -c 1-11 >q41.txt if grep $ln q41.txt then echo "USER IS LOG IN" else echo "USER IS NOT LOG IN" fi

  25. ##QUE26 TAKE 4 NUMERIC VALUES FROM THE USER & FIND OUT MAX VALUE. WRITE A SHELL # SCRIPT FOR IT. # <TYBCA - SEM 5> echo -e "\nEnter 4 numbers" echo -e "\nEnter first no: \c" read first echo -e "\nEnter second no: \c" read second echo -e "\nEnter third no: \c" read third echo -e "\nEnter fourth no: \c" read fourth fs=0 tf=0 if [ $first -ge $second ] then (( fs = first )) else (( fs = second )) fi if [ $third -ge $fourth ]

  26. if [ $third -ge $fourth ] then (( th = third )) else (( th = fourth )) fi if [ $fs -ge $th ] then echo -e "\n$fs is the greatest no" else echo -e "\n$th is the greatest no" fi

  27. #QUE:27 WRITE A SHELL SCRIPT TO DISPLAY THE FOLLOWING INFORMATION. # YOUR LOGIN DIRECTORY IS <LOGIN DIR NAME> # YOUR PRIMARY PROMPT IS <PRIMARY PROMPT> # NOW CURRENT MONTH IS <MONTH> # FILES CAN BE EXECUTED AT <PATH> # <TYBCA - SEM 5> # < echo "YOUR LOGIN DIRECTORY IS:" $HOME echo "YOUR PRIMARY PROMPT IS:" echo "NOW CURRENT MONTH IS:" `date +%B` echo "FILES CAN BE EXECUTED AT:" $PATH

  28. #QUE:29 WRITE A SHELL SCRIPT FOR ACCEPTING THE FOLLOWING INFORMATION AND STORING # IT IN A FILE. # CASSATTE NO. MOVIE NAME. LANGUAGE. PRICE AND DATE OF RELEASE. # <TYBCA - SEM 5> # <SEM - 27> ans="y" while [ $ans == "y" ] do echo "Enter the cassatte no:" read cn echo "Enter the Movie name:" read mn echo "Enter the language:" read ln echo "Enter the price:" read p echo "Enter the date or release:" read dr echo " $cn | $mn | $ln | $p | $dr ">>movie.dat echo "Do you want to continue?[Y/N]" read ans done

  29. # #QUE:31shell procedure to delete the specified record from the # library file. It should accept a book number, check whether it is # existing. If so, display the current details, ask for confirmation # and then delete it from the file. # <TYBCA SEM 5> clear echo -n "ENTER NUMBER OF THE BOOK:=" read Bn c=`grep -c "$Bn" lib1.txt` if [ $c -gt 0 ] then grep "^$Bn" lib1.txt > list2 awk -F "|" '{ printf $1,$2,$3,$4,$5 }' list2 echo `grep $Bn lib1.txt` echo "DO YOU WANT TO DELETE(Y OR N)?" read ans

  30. if [ $ans = 'y' -o $ans = 'Y' ] then echo "THE BOOK IS DELETED" grep -v "^$Bn" lib1.txt > list1 mv list1 lib1.txt else echo "BOOK IS NOT DELETED" fi else echo "FILE DOES NOT EXIST" fi

  31. # QUE:32 Write a shell scripts which finds the occurence of a given word from file echo -n "ENTER THE FILENAME:=" read fn1 awk ' BEGIN { occ = 0 printf "\n ENTER THE WORD TO BE SEARCHED:=" getline wd < "/dev/tty" printf "\n WORD IS:= %s",wd } { i = 0 split($0,ar," ") while( i <= NF ) { i = i+1 if (match(ar[i],wd)) occ++ } } END { printf "\n NO. OF OCCURENCE %d \n ",occ }‘ $fn1

  32. # #QUE:33 WRITE A SHELL SCRIPT TO FIND THE SQUARE ROOT OR A EN NUMBER. # <TYBCA SEM 5> echo "ENTER THE NO:" read no echo "The number is $no" echo "sqrt($no)" | bc -l

  33. ##QUE:38 Write a shell scripts to accept a string in the command line and # reverse the same. # <TYBCA SEM 5> echo $# echo $* > q1 len=$(cat q1 |wc -c) i=`expr $len - 1` echo $i m=" " while [ $i -gt 0 ] do m1=$(cut -c $i q1) echo $m1 m=`echo $m$m1` let i=i-1 done echo $m rm q1

  34. #QUE:39 Write a shell script to accept the number below 50 and display the # square of each this should continue as long as the user wishes. ch='y' while [ $ch = 'y' -o $ch = 'Y' ] do s=0 n=0 flag=0 while [ $flag -eq 0 ] do echo -n "ENTER THE NO:=" read n if [ $n -lt 50 ] then flag=1 else echo "NUMBER MUST BE LESS THEN 50" fi done s=0 s=`expr $n \* $n` echo "THE SQUARE OF $n IS:= $s" echo "DO YOU WANT TO CONTINUE PRESS:= Y/N" read ch done

  35. #QUE:40 Write a shell scripts to accept a name of user as input and check if # the same is present in /etc/passwd file. # <TYBCA SEM 5> clear echo "ENTER THE NAME OF USE TO CHECK IF IT PRESENT IN /etc/passwd" read name if [ -z $name ] then echo "YOU HAVE ENTER THE NULL STRING" else grep "$name" /etc/passwd && printf "FOUND" || echo "USER IS NOT FOUND" fi #QUE:41 WRITE A SHELL SCRIPT TO ACCEPT THE NAME OF THE USER AS INPUT AND CHECK OUT WHETHER THAT USER HAS LOG IN OR NOT. # <TYBCA SEM 5> echo " enter the login name...:" read ln finger | cut -c 1-11 >q41.txt if grep $ln q41.txt then echo "USER IS LOG IN" else echo "USER IS NOT LOG IN" fi

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