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Exam Code: 010-160

Exam Name Linux Essentials Certificate Exam, version 1.6

Certification Provider: LPI

Corresponding Certification: Linux Essentials

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Linux Essentials Certificate Exam, version 1.6 (010-160) Practice Tests

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LPI 010-160 Practice Test 12

Question 110

An operator follows this instruction: Run export APP_MODE=training before starting the script. For the task described as "exported environment variable", what is the most accurate expected result?

  1. export marks the variable for inclusion in child processes' environments.
  2. history shows the shell's retained command history entries.
  3. type reports how Bash resolves the specified command name.
  4. Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.

Explanation

Correct Answer

A:

Correct consequence of Run export APP_MODE=training before starting the script. This outcome explains its use for exported environment variable.

Incorrect Answers

B:

This outcome belongs to shell command history and would follow Run the history built-in; it is not the principal result of Run export APP_MODE=training before starting the script.

C:

This outcome belongs to command type discovery and would follow Run type cd; it is not the principal result of Run export APP_MODE=training before starting the script.

D:

This outcome belongs to single quotes literal dollar and would follow Run echo '$HOME'; it is not the principal result of Run export APP_MODE=training before starting the script.

Question 111

A script launched from the current shell must inherit a new APP_MODE value. A teammate tries this different approach instead: Run the history built-in. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Run the history built-in
  2. Run export APP_MODE=training before starting the script
  3. Run type cd
  4. Run echo '$HOME'

Explanation

Correct Answer

B:

Replace the attempt with this step: export marks the variable for inclusion in child processes' environments. It fits exported environment variable.

Incorrect Answers

A:

This step is specific to shell command history: history shows the shell's retained command history entries. It does not fix the stated requirement for exported environment variable.

C:

This step is specific to command type discovery: type reports how Bash resolves the specified command name. It does not fix the stated requirement for exported environment variable.

D:

This step is specific to single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. It does not fix the stated requirement for exported environment variable.

Question 112

A script launched from the current shell must inherit a new APP_MODE value. One student proposes Run export APP_MODE=training before starting the script and another proposes Run type cd. Which technical comparison is the soundest?

  1. Run type cd is more directly suited to exported environment variable than Run export APP_MODE=training before starting the script, regardless of the stated constraint.
  2. The two actions are interchangeable for exported environment variable and necessarily have the same main result.
  3. Run export APP_MODE=training before starting the script is used because export marks the variable for inclusion in child processes' environments. The alternative Run type cd addresses command type discovery instead.
  4. Run echo '$HOME' is the only useful action for exported environment variable; Run export APP_MODE=training before starting the script has no relevant effect.

Explanation

Correct Answer

C:

Correct distinction: Run export APP_MODE=training before starting the script targets exported environment variable; export marks the variable for inclusion in child processes' environments. The compared alternative instead serves command type discovery.

Incorrect Answers

A:

Incorrect mapping: Run type cd is used for command type discovery. It does not displace Run export APP_MODE=training before starting the script for the described requirement.

B:

The mechanisms are different: export marks the variable for inclusion in child processes' environments. By contrast, type reports how Bash resolves the specified command name. They are not universally interchangeable.

D:

The third option addresses single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. The original action remains relevant because export marks the variable for inclusion in child processes' environments.

Question 113

A learner wants to display commands previously entered in an interactive Bash session. Which action most directly addresses this requirement on a Linux-related system?

  1. Run the history built-in
  2. Run type cd
  3. Run echo '$HOME'
  4. Write "$filename" when passing the variable

Explanation

Correct Answer

A:

Correct for shell command history: history shows the shell's retained command history entries.

Incorrect Answers

B:

This action targets command type discovery: type reports how Bash resolves the specified command name. The stated task instead calls for shell command history.

C:

This action targets single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. The stated task instead calls for shell command history.

D:

This action targets double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename. The stated task instead calls for shell command history.

Question 114

An operator follows this instruction: Run the history built-in. For the task described as "shell command history", what is the most accurate expected result?

  1. type reports how Bash resolves the specified command name.
  2. history shows the shell's retained command history entries.
  3. Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.
  4. Double-quoting parameter expansion prevents word splitting of spaces in the filename.

Explanation

Correct Answer

B:

Correct consequence of Run the history built-in. This outcome explains its use for shell command history.

Incorrect Answers

A:

This outcome belongs to command type discovery and would follow Run type cd; it is not the principal result of Run the history built-in.

C:

This outcome belongs to single quotes literal dollar and would follow Run echo '$HOME'; it is not the principal result of Run the history built-in.

D:

This outcome belongs to double-quoted whitespace safety and would follow Write "$filename" when passing the variable; it is not the principal result of Run the history built-in.

Question 115

A learner wants to display commands previously entered in an interactive Bash session. A teammate tries this different approach instead: Run type cd. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Run type cd
  2. Run echo '$HOME'
  3. Run the history built-in
  4. Write "$filename" when passing the variable

Explanation

Correct Answer

C:

Replace the attempt with this step: history shows the shell's retained command history entries. It fits shell command history.

Incorrect Answers

A:

This step is specific to command type discovery: type reports how Bash resolves the specified command name. It does not fix the stated requirement for shell command history.

B:

This step is specific to single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. It does not fix the stated requirement for shell command history.

D:

This step is specific to double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename. It does not fix the stated requirement for shell command history.

Question 116

A learner wants to display commands previously entered in an interactive Bash session. One student proposes Run the history built-in and another proposes Run echo '$HOME'. Which technical comparison is the soundest?

  1. Run echo '$HOME' is more directly suited to shell command history than Run the history built-in, regardless of the stated constraint.
  2. The two actions are interchangeable for shell command history and necessarily have the same main result.
  3. Write "$filename" when passing the variable is the only useful action for shell command history; Run the history built-in has no relevant effect.
  4. Run the history built-in is used because history shows the shell's retained command history entries. The alternative Run echo '$HOME' addresses single quotes literal dollar instead.

Explanation

Correct Answer

D:

Correct distinction: Run the history built-in targets shell command history; history shows the shell's retained command history entries. The compared alternative instead serves single quotes literal dollar.

Incorrect Answers

A:

Incorrect mapping: Run echo '$HOME' is used for single quotes literal dollar. It does not displace Run the history built-in for the described requirement.

B:

The mechanisms are different: history shows the shell's retained command history entries. By contrast, Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. They are not universally interchangeable.

C:

The third option addresses double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename. The original action remains relevant because history shows the shell's retained command history entries.

Question 117

A trainee wants to know whether cd is a Bash built-in rather than an external executable. Which action most directly addresses this requirement on a Linux-related system?

  1. Run echo '$HOME'
  2. Run type cd
  3. Write "$filename" when passing the variable
  4. Prepend "$HOME/bin" to PATH and export PATH

Explanation

Correct Answer

B:

Correct for command type discovery: type reports how Bash resolves the specified command name.

Incorrect Answers

A:

This action targets single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. The stated task instead calls for command type discovery.

C:

This action targets double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename. The stated task instead calls for command type discovery.

D:

This action targets PATH executable lookup: PATH contains directories the shell searches when resolving external commands. The stated task instead calls for command type discovery.

Question 118

An operator follows this instruction: Run type cd. For the task described as "command type discovery", what is the most accurate expected result?

  1. Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.
  2. Double-quoting parameter expansion prevents word splitting of spaces in the filename.
  3. type reports how Bash resolves the specified command name.
  4. PATH contains directories the shell searches when resolving external commands.

Explanation

Correct Answer

C:

Correct consequence of Run type cd. This outcome explains its use for command type discovery.

Incorrect Answers

A:

This outcome belongs to single quotes literal dollar and would follow Run echo '$HOME'; it is not the principal result of Run type cd.

B:

This outcome belongs to double-quoted whitespace safety and would follow Write "$filename" when passing the variable; it is not the principal result of Run type cd.

D:

This outcome belongs to PATH executable lookup and would follow Prepend "$HOME/bin" to PATH and export PATH; it is not the principal result of Run type cd.

Question 119

A trainee wants to know whether cd is a Bash built-in rather than an external executable. A teammate tries this different approach instead: Run echo '$HOME'. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Run echo '$HOME'
  2. Write "$filename" when passing the variable
  3. Prepend "$HOME/bin" to PATH and export PATH
  4. Run type cd

Explanation

Correct Answer

D:

Replace the attempt with this step: type reports how Bash resolves the specified command name. It fits command type discovery.

Incorrect Answers

A:

This step is specific to single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. It does not fix the stated requirement for command type discovery.

B:

This step is specific to double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename. It does not fix the stated requirement for command type discovery.

C:

This step is specific to PATH executable lookup: PATH contains directories the shell searches when resolving external commands. It does not fix the stated requirement for command type discovery.

Question 120

A trainee wants to know whether cd is a Bash built-in rather than an external executable. One student proposes Run type cd and another proposes Write "$filename" when passing the variable. Which technical comparison is the soundest?

  1. Run type cd is used because type reports how Bash resolves the specified command name. The alternative Write "$filename" when passing the variable addresses double-quoted whitespace safety instead.
  2. Write "$filename" when passing the variable is more directly suited to command type discovery than Run type cd, regardless of the stated constraint.
  3. The two actions are interchangeable for command type discovery and necessarily have the same main result.
  4. Prepend "$HOME/bin" to PATH and export PATH is the only useful action for command type discovery; Run type cd has no relevant effect.

Explanation

Correct Answer

A:

Correct distinction: Run type cd targets command type discovery; type reports how Bash resolves the specified command name. The compared alternative instead serves double-quoted whitespace safety.

Incorrect Answers

B:

Incorrect mapping: Write "$filename" when passing the variable is used for double-quoted whitespace safety. It does not displace Run type cd for the described requirement.

C:

The mechanisms are different: type reports how Bash resolves the specified command name. By contrast, Double-quoting parameter expansion prevents word splitting of spaces in the filename. They are not universally interchangeable.

D:

The third option addresses PATH executable lookup: PATH contains directories the shell searches when resolving external commands. The original action remains relevant because type reports how Bash resolves the specified command name.