Question 1

A ____ is several programs simultaneously processing the same I/O stream.
A) pipeline
B) pipe
C) filter
D) redirect

Accepted Answer

A pipeline in computing refers to a set of data processing elements connected in series, where the output of one element is the input of the next one. It allows for several programs to process the same I/O stream in sequence, each program taking the output of the previous program as its input.

Question 2

The command ____ is used to lower the priority of a process.
A) lp
B) set priority
C) nice
D) low

Accepted Answer

The command "nice" is used to adjust the priority of a process. By default, a process runs with a priority of 0. The nice command can be used to increase or decrease this priority value, with a higher nice value indicating a lower priority. So, using the "nice" command with a positive value will decrease the priority (make it lower) of a process.

Question 3

The command,____ ,will copy the contents of chapt1 and chapt2 into a file named section_a.
A) section_a = chapt1 + chapt2
B) cp chapt1 section_a,cp chapt2 section_a
C) cat chapt1 chapt2 > section_a
D) ls chapt1,chapt2,section_a

Accepted Answer

The "cat" command is used to concatenate files and the ">" symbol is used to redirect the output of the command into a new file. So "cat chapt1 chapt2 > section_a" will concatenate the contents of chapt1 and chapt2 and save them into a new file named section_a.

Quiz 13: Unix Operating Systems

A ____ is several programs simultaneously processing the same I/O stream.

The command ____ is used to lower the priority of a process.

The command,____ ,will copy the contents of chapt1 and chapt2 into a file named section_a.