Laboratory Experiments:
a) Explore the Unix environment.
b) Explore vi editor with vim tutor. Perform the following operations using vi editor, but not limited to:
1. Insert character, delete character, replace character
2. Save the file and continue working
3. Save the file and exit the editor
4. Quit the editor
5. Quit without saving the file
6. Rename a file
7. Insert lines, delete lines,
8. Setline numbers
9. Search for a pattern
10. Move forward and backward
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 write this maximum value to the standard output.
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.
2a.Write a shell script that accepts two filenames as arguments, checks if the permissions for these files are identical and if the permissions are identical, output common permissions and otherwise output each filename followed by its permissions.
2b.Write a shell script which accepts valid log-in names as arguments and prints their corresponding home directories, if no arguments are specified, print a suitable error message.
3a.Create a script file called file-properties that reads a filename entered and outputs it Properties.
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 as 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.
4a. Write a shell script that accept one or more file names as argument and convert all of them to uppercase, provided they exist in current directory.
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. I f this second argument 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.
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.
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.
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. 6b. Write a shell script to list all the files in a directory whose filename is atleast 10 characters.(use expr command to check the length)
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.
7b. Write a shell script that accept a list of filenames as its argument, count and report occurrence of e a c h word that is present in the first argument file on other argument files.
8a. Write a shell script that determine the period for which as specified use ris working on system and display appropriate message.
8b. Write a shell script that reports the logging in of as specified user within one minute after he/she login. The script automatically terminate if specified user does not login during as specified period of t i m e .
9a.Write a shell script that accept the filename, starting and ending line number as an argument and display all the lines between the given line number.
9b. Write a shell script that folds long lines into 40 columns. Thus any line that exceeds 40 characters must be broken after 40 th , 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.
10a. Write an awkscript that accepts date argument in the form of dd-mm-yy and display it in the form month, day and year. The script should check the validity of the argument and in the case of error, display a suitable message.
10b. Write an awkscript to delete duplicated line from a text file. The order of the original lines must remain unchanged.
11a. Write an awkscript of 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
11b. Write an awkscript 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>=1000 0thenHRA=20% of basic &DA=50% of basic.
Note 1: In the practical Examination each student has to pick one question from a lot of all 11 questions.
Note 2: Change of program is not permitted in the Practical Examination.