Description : Which command is used to display the top of the file? A. cat B. head C. more D. grep E. None of the above
Last Answer : B. head
Description : What does the following command do? grep −vn abc x (A) It will print all of the lines in the file x that match the search string abc (B) It will print all of the lines in file x that do not ... (D) It will print the specific line numbers of the file x in which there is a match for string abc
Last Answer : (A) It will print all of the lines in the file x that match the search string “abc”
Description : The command which transcribes the standard input to the standard output and also makes a copy of the same in a file is A. tee B. tr C. sort D. grep E. None of the above
Last Answer : A. tee
Description : Which of the following commands is used to update access and modification times of a file? A. grep B. wc C. touch D. cat E. None of the above
Last Answer : C. touch
Description : Which of the following is not a communication command. A. write B. mesg C. mail D. grep E. None of the above
Last Answer : D. grep
Description : Which symbol will be used with grep command to match the pattern pat at the beginning of a line? A. ^pat B. $pat C. pat$ D. pat^ E. None of the above
Last Answer : A. ^pat
Description : With suitable examples differentiate between grep and fgrep command.
Last Answer : grep command fgrep command grep is an acronym that stands for "Global Regular Expressions Print". fgrep is an acronym that stands for "Fixed-string Global Regular Expressions ... Example: fgrep support myfile.txt Search for support in the myfile.txt
Description : Which of the following files will displayed by this command cat *ch* A. patch B. catch C. .ch D. All of the above E. None of the above
Last Answer : D. All of the above
Description : Which command is used to display a file contents in octal form? A. cd B. od C. of D. oct E. None of the above
Last Answer : B. od
Description : Which command is used to count just the number of characters in a file? A. wc - 1 B. wc -c C. wc -w D. wc -r E. None of the above
Last Answer : B. wc -c
Description : Which command is used to remove a file? A. remove B. rm C. mv D. del E. None of the above
Last Answer : B. rm
Description : The Octal number to be given alogn with chmod command to make a file readable, writable and executable to the owner, readable and executable to group and others is: A. 000 B. 755 C. 744 D. 555 E. None of the above
Last Answer : B. 755
Description : Which command is used to remove the read permission of the file 'note' from both the group and others? A. chmod go+r note B. chmod go+rw note C. chmod go-x note D. chmod go-r, 4-x note E. None of the above
Last Answer : D. chmod go-r, 4-x note
Description : Which command sends the word count of the file infile to the newfile. A. wc infile >newfile B. wc newfile C. wc infile - newfile D. wc infile | newfile E. None of the above
Last Answer : A. wc infile >newfile
Description : Which command is used to sort the lines of data in a file in reverse order A. sort B. sh C. st D. sort -r E. None of the above
Last Answer : D. sort -r
Description : Which command is used to concatenate all files beginning with the string 'emp' and followed by a non-numeric characters? A. cat emp[!0-9] B. more [emp][!0-9] C. cat emp[x-z]
Last Answer : A. cat emp[!0-9]
Description : Consider the following UNIX command: sort temp; head -30
Last Answer : (C) Sort, taking the input from "in" and writing the output to "temp" then prints 30 lines from temp on terminal. Finally "temp" is removed.
Description : What will be the output of the following Unix command ? $rm chap0\[1 - 3\] (A) Remove file chap0[1 - 3] (B) Remove file chap01, chap02, chap03 (C) Remove file chap\[1 - 3\] (D) None of the above
Last Answer : (A) Remove file chap0[1 - 3]
Description : In Unix, the command to enable execution permission for file “mylife” by all is ................ (A) Chmod ugo+X myfile (B) Chmod a+X myfile (C) Chmod +X myfile (D) All of the above
Last Answer : (D) All of the above
Description : What is the function of following UNIX command? WC - lb& (A) It runs the word count program to count the number of lines in its input, a, writing the result to b, as a foreground process. (B) It runs ... (D) It copies the l ' numbers of lines of program from file, a, and stores in file b.
Last Answer : (B) It runs the word count program to count the number of lines in its input, a, writing the result to b, but does it in the background.
Description : Unix command to change the case of first three lines of file “shortlist” from lower to upper (1) $ tr ‘[a-z]’ ‘[A-Z]’ shortlist | head-3 (2) $ head-3 shortlist | tr ‘[a-z]’ ‘[A-Z]’ (3) $ tr head-3 shortlist ‘[A-Z]’ ‘[a-z]’ (4) $ tr shortlist head-3 ‘[a-z]’ ‘[A-Z]’
Last Answer : (2) $ head-3 shortlist | tr ‘[a-z]’ ‘[A-Z]’
Description : For using a specific database …………… command is used. A) use database B) databasename use C) Both A &B D) None of them
Last Answer : A) use database
Description : Which menu is selected to cut, copy and paste: a) File b) Tool c) Title d) Edit e) None of The Above
Last Answer : d) Edit
Description : What menu is selected to cut, copy, and paste? 1) File 3 2) Tools 3) Special 4) Edit 5) None
Last Answer : Answer :4
Description : How do I copy and paste only the columns I want?
Last Answer : Copy from what? A Word document, a PDF, a web page…?
Description : Consider the following conditions : (a) The solution must be feasible, i.e. it must satisfy all the supply and demand constraints. (b) The number of positive allocations must be equal to m+n-1, where m is the number of rows and n is ... B) (a) and (c) only (C) (b) and (c) only (D) (a), (b) and (c)
Last Answer : (D) (a), (b) and (c)
Description : ……………… defines rules regarding the values allowed in columns and is the standard mechanism for enforcing database integrity. A) Column B) Constraint C) Index D) Trigger
Last Answer : (B) Constraints
Description : Select operator is not a unary operator. ii) Project operator chooses subset of attributes or columns of a relation. A) i-True, ii-False B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False
Last Answer : C) i-False, ii-True
Description : The number of tuples in a relation is called its …………. While the number of attributes in a relation is called it’s ……………….. A) Degree, Cardinality B) Cardinality, Degree C) Rows, Columns
Last Answer : B) Cardinality, Degree
Description : Which of the following operation is used if we are interested in only certain columns of a table? (A) PROJECTION (B) SELECTION (C) UNION (D) JOIN
Last Answer : (A) PROJECTION
Description : The “PROJECT” operator of a relational algebra creates a new table that has always (A) More columns than columns in original table (B) More rows than original table (C) Same number of rows as the original table (D) Same number of columns as the original table
Last Answer : (C) Same number of rows as the original table
Description : In the Hungarian method for solving assignment problem, an optimal assignment requires that the maximum number of lines that can be drawn through squares with zero opportunity cost be equal to the number of: (A) rows or columns (B) rows+columns (C) rows+columns-1 (D) rows+columns+1
Last Answer : (A) rows or columns
Description : In a relational database model, NULL values can be used for all but which one of the following? (A) To allow duplicate tuples in the table by filling the primary key column(s) with NULL. (B) To ... D) To fill a column in a tuple when that column does not really exist for that particular tuple.
Last Answer : (A) To allow duplicate tuples in the table by filling the primary key column(s) with NULL.
Description : Which command is used to remove a directory? A. rd B. rmdir C. dldir D. rdir E. None of the above
Last Answer : B. rmdir
Description : Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3? A. chmod u+x emp[l-3] B. chmod 777 emp* C. chmod u+r ??? emp D. chmod 222 emp? E. None of the above
Last Answer : A. chmod u+x emp[l-3]
Description : The Unix command: $ vi file1 file2 (A) Edits file1 and stores the contents of file1 in file2 (B) Both files i.e. file1 and file2 can be edited using ex' command to travel between files (C) Both ... using the mv' command to move between the files (D) Edits file1 first, saves it and the edits file2
Last Answer : (B) Both files i.e. file1 and file2 can be edited using ‘ex’ command to travel between files
Description : In a relational database, this is a data structure that organizes the information about a single topic into rows and columns. 1) Block 2) Record 3) Tuple 4) Table 5) Command line interface
Description : Which symbol is used to separate more than one command in the same command line? A. $ B. # C. : D. ;
Last Answer : D. ;
Description : Which command is used to copy all files having the string chap and any two characters after that to the progs directory? A. cp chap?? progs B. cp chap* progs C. cp chap[12] /progs/*.*
Last Answer : A. cp chap?? progs
Description : The command javac A) Converts a java program into binary code B) Converts a java program into bytecode C) Converts a java program into machine language D) None of the above.
Last Answer : B) Converts a java program into bytecode
Description : The command javac is used to A) debug a java program B) compile a java program C) interpret a java program D) execute a java program
Last Answer : B) compile a java program
Description : The type(s) of auto executing macros, in Microsoft word is/are A) Auto execute B) Auto macro C) Command macro D) All of the above
Last Answer : D) All of the above
Description : To delete a database ................... command is used A) delete database database_name B) Delete database_name C) drop database database_name D) drop database_name
Last Answer : C) drop database database_name
Description : Suppose d = {“john”:40, “peter”:45}. To obtain the number of entries in dictionary which command do we use? a) d.size() b) len(d) c) size(d) d) d.len()
Last Answer : b) len(d)
Description : Suppose d = {“john”:40, “peter”:45}, to delete the entry for “john” what command do we use a) d.delete(“john”:40) b) d.delete(“john”) c) del d[“john”]. d) del d(“john”:40)
Last Answer : c) del d[“john”].
Description : To remove string “hello” from list1, we use which command ? a) list1.remove(“hello”) b) list1.remove(hello) c) list1.removeAll(“hello”) d) list1.removeOne(“hello”)
Last Answer : d) list1.removeOne(“hello”)
Description : To insert 5 to the third position in list1, we use which command ? a) list1.insert(3, 5) b) list1.insert(2, 5) c) list1.add(3, 5) d) list1.append(3, 5)
Last Answer : a) list1.insert(3, 5)
Description : To add a new element to a list we use which command ? a) list1.add(5) b) list1.append(5) c) list1.addLast(5) d) list1.addEnd(5)
Last Answer : a) list1.add(5)
Description : The mv command changes (A) the inode (B) the inode-number (C) the directory entry (D) both the directory entry and the inode
Last Answer : (C) the directory entry
Description : Which of the following commands would return process_id of sleep command? (A) Sleep 1 and echo $? (B) Sleep 1 and echo $# (C) Sleep 1 and echo $x (D) Sleep 1 and echo $!
Last Answer : (D) Sleep 1 and echo $!