unix qs

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LEVEL - I

List all the files and subdirectories of the directory /bin =  cd bin ls bin List all the files including hidden files in your current directory = ls -a List all the files starting with letter 'r' in your current directory = ls r* List all the files having three characters in their names from your current directory. = ls ??? 5. List all the files with extension .doc in your current directory = ls *.doc 6. List all the files having the first letter of their name within the range 'l' to , 's' from your current directory = ls [l-s]* 7. Create a file text1 and read its input from keyboard =  cat > text1 8. Copy contents of file text1 to another file text2 =  cp text1 text2 text2 9. Append the contents of file text2 to file text1 =  cat >> text1 text2 10. Count the number of files in the current directory = ls|wc -w 11. Display the output of command ls -l to a file and on the output screen = ls -l|cat >  text3 or ls -l|cat>>text2 12. From file text1 print all lines starting from 10th line =  tail +10 text1 text1 13. Find the number of users currently logged on to the system = who|wc -l  14. Delete all the files with their names starting with "tmp" =  rm tmp* 1. 2. 3. 4.

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LEVEL - II

1. Create a file FILE2 with some text in it. Increase the no. of hard links to the file FILE2 to 3 and check the inode number and link count for those names = ls -l FILE2 Fl1 Fl2|cut  d " " -f3,10 2. Using one single command, display the output of "who" and "pwd" commands =who;pwd  3. Display today's date = echo "Today is $(date+%a) $(date+%d) $(date+%h)  $ (date+%y) (date+%y) " 4. Display the text message on monitor screen "We are done!!!" = echo "We are done!!!" 5. Display the message on monitor screen "The long listing of my home dir ----- is -----" = 'the long listing of my home dir '; pwd; echo ' is ';ls -l  

LEVEL - III

1. List only the directories in your current directory =  find -type d|nl  2. Display the name and count of the directories in the current directory =  find -type d  print; find -type d|wc d|wc -l  3. Find out whether the users with a pattern "itp9" in their names have logged in = who|cut  d " " -f1|fgrep -f1|fgrep itp9 4. Find out whether a particular user "itp9" has logged in o  n=`who|cut  n=`who|cut -d " " -f1|fgrep -f1|fgrep ncs|wc-l` ncs|wc-l` if test $n -ne 0 then echo -e "no" else echo -e "yes" fi 5. Assign a value "Black" to var1 and then display the following message on the terminal using this variable "Sirius Black is a true marauder." o Set var1 Black

echo "Sirius $var1 is a true marauder." 6. Create the file employee.txt having ":" separated fields. The fields of record are : enumber, ename, eposition, esal, edoj, edept. Now answer the following. o

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1. List all the employees along with a row number =  cat employee.txt|cut -d ":"  f2|nl  2. Sort the files as per names =  cat employee.txt|sort -t ":" +1 -2 3. List top three salaried employees =  cat employee.txt|sort -r -t ":" +3 -4|head -3 4. Rmove duplicate record from the file =  cat employee.txt|unique 5. List dept. no along with no. of emplooyees working in each dept = cat employee.txt|cut -d ":" -f6, 1|unique 6. Sort the file in descending order of salary =  cat employee.txt|sort -r -t ":" +3 -4 

LEVEL - IV

1. Accept a file name and a number (x). Display x lines from the top of the file. Check if the file exists and is readable. The value of x should not exceed the total no. of lines in the files. Display suitable messages in case an error is encountered.

echo 'Enter the file name' read file if test -e  file then echo 'File exists.' if test -r file 'File is readable' echo 'Enter the line no.' read   n x=`wc.. -l $file|cut -d " " -f1` if test $n -lc  $x then head -$n  $file else echo 'The value exceeds total no of  lines.' fi else echo 'File is not  readable' fi else echo 'File doesn't exist' fi

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