Select all of the following statements that are correct. The answers are in the

ID: 3663368 • Letter: S

Question

Select all of the following statements that are correct. The answers are in the text for this question and/or in the introduction to this lab.

Question 1 options:

_SSH is a protocol for exchanging encrypted information between a client computer and a server computer. SSH is secure because generally speaking, only the intended recipient of information will be able to correctly decode the information.

_A protocol is a set of rules to enable communication between two or more computers. Many different protocols exist, and in some cases, many different protocols exist to access the same service offered by a remote computer.

_Oracle Corporation's Solaris and Apple's OS X are Unix(tm). (Search ref: Single Unix Specification)

_Linux IS Unix (tm).

_With few exceptions, Linux does not conform to technical standards defined for Unix operating systems.

_Linux is available in many different configurations called distributions. Various distributions organize files slightly differently and contain different default programs for tasks such as web browsing, email, command line interfaces, software development, etc.

_THe introduction to this lab as well as many searchable reputable sources claim Linux is a popular platform for research into operating systems, developer tools, user interfaces, and Internet services.

Select all of the following statements that true:

Question 2 options:

_Executing "cd ~" without the quotes produces a different result than executing cd with no option/argument.

_The a option is passed to the ls command to tell ls to output information about all files in the current directory including files that are hidden by default. The l option is passed to the ls command to tell ls to output extra information (a "long" listing) about files in the current directory.

_The commands, cd; pwd; ls -la, are executed from left to right. The pwd command does not run until the cd command has finished running. The ls -la command does not run until the pwd command has finished running.

_Commands entered separately - each on its own line - work the same way as commands separated by semi-colons, ';' characters.

_The pwd command outputs ("prints") the current working directory.

_Executing the cd command with no option/argument does nothing.

Select all of the following statements that are true:

Question options:

_The man -k command and the apropos command do the same thing. In other words, apropos produces the same result as the man command used with its -k option. The man command followed by a keyword displays the full contents of the man page about that topic (if such topic exists), but when used with its -k option it only shows the name, section number and first line of the page. Thus, for example,

man -k editor

returns the same result as

apropos editor

_The wc program reads a file provided as an argument and outputs the number of lines, words, and bytes (sometimes called characters) in the file. Perform an Internet search or use man wc to find out.

_There is a program named exit in the default $PATH provided with your account on Thor.

_The -l argument to the wc command tells wc to output only the number of lines in a text file.

_The $PATH shell variable stores the sequence of file system paths a shell will search when trying to find a program. Perform an Internet search or use man.

_Oracle Corporation's Solaris and Apple's OS X are Unix(tm). (Search ref: Single Unix Specification)

_Linux IS Unix (tm).

_With few exceptions, Linux does not conform to technical standards defined for Unix operating systems.

Explanation / Answer

a) SSH is a protocol for exchanging encrypted information between a client computer and a server computer. SSH is secure because generally speaking, only the intended recipient of information will be able to correctly decode the information. It is TRUE.

b) A protocol is a set of rules to enable communication between two or more computers. Many different protocols exist, and in some cases, many different protocols exist to access the same service offered by a remote computer.It is TRUE.

c) Oracle Corporation's Solaris and Apple's OS X are Unix(tm). (Search ref: Single Unix Specification). It is FALSE.

d)Linux IS Unix (tm).It is TRUE.

e) With few exceptions, Linux does not conform to technical standards defined for Unix operating systems. It is FALSE.

f) Linux is available in many different configurations called distributions. Various distributions organize files slightly differently and contain different default programs for tasks such as web browsing, email, command line interfaces, software development, etc. It is TRUE.

g) THe introduction to this lab as well as many searchable reputable sources claim Linux is a popular platform for research into operating systems, developer tools, user interfaces, and Internet services. It is TRUE.

a) Executing "cd ~" without the quotes produces a different result than executing cd with no option/argument. It is TRUE.

b) The a option is passed to the ls command to tell ls to output information about all files in the current directory including files that are hidden by default. The l option is passed to the ls command to tell ls to output extra information (a "long" listing) about files in the current directory. It is TRUE.

c) The commands, cd; pwd; ls -la, are executed from left to right. The pwd command does not run until the cd command has finished running. The ls -la command does not run until the pwd command has finished running. It is TRUE.

d) Commands entered separately - each on its own line - work the same way as commands separated by semi-colons, ';' characters. It is TRUE.

e) The pwd command outputs ("prints") the current working directory. It is TRUE.

f) Executing the cd command with no option/argument does nothing. It is TRUE.

a) The man -k command and the apropos command do the same thing. In other words, apropos produces the same result as the man command used with its -k option. The man command followed by a keyword displays the full contents of the man page about that topic (if such topic exists), but when used with its -k option it only shows the name, section number and first line of the page. Thus, for example,

man -k editor

returns the same result as

apropos editor. It is TRUE.

b) The wc program reads a file provided as an argument and outputs the number of lines, words, and bytes (sometimes called characters) in the file. Perform an Internet search or use man wc to find out. It is TRUE.

c) There is a program named exit in the default $PATH provided with your account on Thor. It is FALSE.

d) The -l argument to the wc command tells wc to output only the number of lines in a text file. It is TRUE.

e) The $PATH shell variable stores the sequence of file system paths a shell will search when trying to find a program. Perform an Internet search or use man. It is TRUE.

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