All Free Software Engineering MCQs with Answers

• A. standard input file
• B. standard output file
• C. both input and output file
• D. neither standard input nor standard output file

Explanation: cp copies data from named source files to named destination files and does not normally read from standard input or write to standard…

• A. cd
• B. od
• C. of
• D. oct

Explanation: The od command, meaning octal dump, displays file data in octal and other selectable formats.

• A. S
• B. s
• C. r
• D. C

Explanation: In vi, s substitutes the character under the cursor and enters text-insertion mode, allowing new text to be typed.

• A. rename
• B. delete
• C. rm
• D. cp

Explanation: rm removes files from a Unix filesystem, while cp copies them and rename is not the standard Unix deletion command.

• A. lp
• B. pg
• C. prn
• D. print

Explanation: lp is the traditional Unix command for sending a file to a line printer or print queue.

• A. w
• B. e
• C. a
• D. b

Explanation: In vi, `b` moves the cursor backward to the beginning of the current or previous word.

• A. countw
• B. wcount
• C. wc
• D. count p

Explanation: `wc` means word count and reports the number of lines, words, and bytes or characters in a file.

• A. capture a file
• B. display a file
• C. print a file
• D. copy a file

Explanation: `cat` reads a file and writes its contents to standard output, so it is commonly used to display a file in the terminal.

• A. x
• B. X
• C. dd
• D. D

Explanation: In vi command mode, `x` deletes the character at or beneath the cursor.

• A. 1024 bytes
• B. 2048 bytes
• C. 512 bytes
• D. 256 bytes

Explanation: Traditional Unix file systems use physical disk blocks of 512 bytes, although modern Unix-like systems may use different block sizes.

• A. erase
• B. delete
• C. rm
• D. dm

Explanation: The `rm` command removes files and, with suitable options, directories.

• A. chmod go+r note
• B. chmod a-rw
• C. chmod ugo=r note
• D. chmod u+r,g+r,o-x note

Explanation: `chmod ugo=r note` assigns read permission to the user, group, and others while removing write and execute permissions.

• A. mesg
• B. grep
• C. halt
• D. sleep

Explanation: `mesg` controls whether other users may send messages to a terminal, with `mesg n` restricting incoming messages.

• A. rename
• B. remove
• C. mv
• D. ren

Explanation: Unix uses `mv` both to move a file and to rename it when the destination is in the same directory or has a new name.

• A. group has read permission only
• B. other has read permission only
• C. owner has read permission only
• D. group has write permission only

Explanation: Unix permissions are grouped as owner, group, and others, in that order.

• A. ls -1
• B. ls -t
• C. ls -i
• D. ls -R

Explanation: The `-t` option sorts directory entries by modification time, showing the most recently modified files first.

• A. $!
• B. $#
• C. 0
• D. $*

Explanation: The special variable `$!` expands to the process ID of the most recently started background job.

• A. remove
• B. rm
• C. mv
• D. del

Explanation: `rm` is the standard Unix/Linux command for removing files. `mv` moves or renames a file, while `remove` and `del` are not the standard…

• A. ^pat
• B. $pat
• C. pat$
• D. pat^

Explanation: In grep regular expressions, `^` anchors a pattern to the beginning of a line, so `^pat` matches lines that start with `pat`.

• A. chmod go+r note
• B. chmod go+rw note
• C. chmod go-x note
• D. chmod go-r note

Explanation: In `chmod`, `go` selects the group and others classes, while `-r` removes read permission, making `chmod go-r note` the required command.