UNIX 2-2

Which "ls" command option will display hidden files?

-a

What is a LInux shell?

A program which interprets and executes user commands.

The output of the command: ls -l produces information about each file in the working directory including:

All

What command will send page1, page2, page3, page4, page5, and page6 to the local printer?

All

Given the command: cat ?[xyz]*.cpp which of the following files with be displayed?

All of these filenames meet the criteria in the command.

What is the shell special character that matches zero or more characters?

Asterisk (*)

The who | sort > grep command:

Creates a file called grep containing the output of the who command after sorting. It does not recognize grep in this context as a command.

A command that reads its standard input from the output of another command; and, writes its standard output to the standard input of another command is called:

Filter

What is the purpose of the "--help" option?

None

What is the shell special character that creates a pipe between commands?

None

Which of the following commands is executed in the background?

The & causes the process to occur in the background.

If a command is a simple file name, the shell will seach:

The PATH variable lists al of the directories to be searched by the shell looking for a specific executable file.

What command will terminate process 18228 which is running in the background?

The command to use is kill with the process id as the argument.

The command: ls program[12345] can generate which of the following lists of filenames?

The list will contain filenames which begin with "program" and ends with a single digits between 1 and 5.

When interpreting your commands, the shell assumes the first word you type on the command line is

a valid command name or program.

Which command will append file "extra" to "customers"?

cat extra >> customers

The question mark (?) is a special character that cause the shell to:

generate filenames which match any single character in the name of a file.

What is the output of the jobs command?

jobs displays a list of suspended jobs and background jobs.

In the following Linux command, which is the "command argument?" ls -al m*

m*

Which file will not be displayed with the following command? cat page[134589]*

page6

The command: ls -al | less is an example of ___________________.

pipleline

What are the two types of shell commands?

shell builtins and and stand alone utilities

What character is used to separate elements on the Linux command line?

spaces and tabs.

The command: ls ~/* will list:

the ls ~/* displays all files in the home directory except hidden files.

Where is the output of the following command displayed? cat file1 | grep rbass > /dev/null

the output disappears without a trace.