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Create a shell script to send a customized mail memo to the users listed on the command line by login (user) name, only if they are currently logged on. If no users are listed on the command line, an error message should be printed.
In the mail message, the full (real) name from the passwd file (/etc/passwd) should be used. Also, mail should be signed with the real name of the person who is running the script.
Following error message should be printed if an argument username does not exist in the passwd file - "Please send this message to users whom you know personally.".
The mail message should be as follows:
Hello "<INSERT THE ARGUMENT USER'S REAL NAME FROM THE PASSWORD FILE>",
Please ignore this mail. The current time and date is <CURRENT DATE AND TIME>. Have a nice day.
"<INSERT THE SCRIPT RUNNING USER'S REAL NAME FROM THE PASSWORD FILE>"
Whenever the pointer of a list or a tree is manipulated, procedure that performs this operation must be considered to be in a critical section.
Design a Unix shell script that searches for a text document with most occurrences of a given keyword. For instance, if I would like to search for a script with most usages of if statement,
Calculate the median using as few queries as possible. Provide an algorithm which determines the median value using at most O(lg n) queries.
Describe a FAIRCOIN algorithm that returns either 0 or 1 with equal probability, using ONEINTHREE as your only source of randomness.
Assume we use hash function h to hash n distinct keys into the array T of length m. Suppose simple uniform hashing, determine the expected number of collisions?
Suppose that the tables T1 and T2 have a 1:1 relationship. Suppose that T2 has the foreign key. Demonstrate the SQL statements necessary to move the foreign key to T1.
A certain hard disk has 480 cylinders, sixteen tracks, and thirty-two sectors of 512 bytes each. It spins at 4800 revolutions per minute, and has an adjacent cylinder seek time of eighty msec, and a max seek time of onde hundred msec.
Data structures for a single algorithm
Nazca Cinemas is a tiny movie theater that would like you to create a movie scheduling database system for them. The theater has 4-screens. Each screens has its own unique ID
Can the speed in which data is transmitted have an adverse effect on fundamental business decisions? Yes, speed that is traveling at big rates of speed can have an affect on fundamental business decisions.
The tax authorities working for many governments are often confronted with challenge of detecting tax evasion and fraud. Suppose you work at income tax department.
Discuss how would you approach a backup and administration plan for hypothetical condition given below. With any network administration systems that should be installed for remote access in event of a network emergency.
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