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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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LPI 010-160 Practice Test 13

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.

Question 121

A document must show the exact text $HOME without expanding it. Which action most directly addresses this requirement on a Linux-related system?

  1. Write "$filename" when passing the variable
  2. Prepend "$HOME/bin" to PATH and export PATH
  3. Run echo '$HOME'
  4. Prefix that command with LANG=C on the same command line

Explanation

Correct Answer

C:

Correct for single quotes literal dollar: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.

Incorrect Answers

A:

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 single quotes literal dollar.

B:

This action targets PATH executable lookup: PATH contains directories the shell searches when resolving external commands. The stated task instead calls for single quotes literal dollar.

D:

This action targets temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. The stated task instead calls for single quotes literal dollar.

Question 122

An operator follows this instruction: Run echo '$HOME'. For the task described as "single quotes literal dollar", what is the most accurate expected result?

  1. Double-quoting parameter expansion prevents word splitting of spaces in the filename.
  2. PATH contains directories the shell searches when resolving external commands.
  3. A leading variable assignment applies to that command's environment rather than permanently changing the parent shell.
  4. Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.

Explanation

Correct Answer

D:

Correct consequence of Run echo '$HOME'. This outcome explains its use for single quotes literal dollar.

Incorrect Answers

A:

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

B:

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

C:

This outcome belongs to temporary assignment environment and would follow Prefix that command with LANG=C on the same command line; it is not the principal result of Run echo '$HOME'.

Question 123

A document must show the exact text $HOME without expanding it. A teammate tries this different approach instead: Write "$filename" when passing the variable. 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. Prefix that command with LANG=C on the same command line

Explanation

Correct Answer

A:

Replace the attempt with this step: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. It fits single quotes literal dollar.

Incorrect Answers

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 single quotes literal dollar.

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 single quotes literal dollar.

D:

This step is specific to temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. It does not fix the stated requirement for single quotes literal dollar.

Question 124

A document must show the exact text $HOME without expanding it. One student proposes Run echo '$HOME' and another proposes Prepend "$HOME/bin" to PATH and export PATH. Which technical comparison is the soundest?

  1. Prepend "$HOME/bin" to PATH and export PATH is more directly suited to single quotes literal dollar than Run echo '$HOME', regardless of the stated constraint.
  2. Run echo '$HOME' is used because Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. The alternative Prepend "$HOME/bin" to PATH and export PATH addresses PATH executable lookup instead.
  3. The two actions are interchangeable for single quotes literal dollar and necessarily have the same main result.
  4. Prefix that command with LANG=C on the same command line is the only useful action for single quotes literal dollar; Run echo '$HOME' has no relevant effect.

Explanation

Correct Answer

B:

Correct distinction: Run echo '$HOME' targets single quotes literal dollar; Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. The compared alternative instead serves PATH executable lookup.

Incorrect Answers

A:

Incorrect mapping: Prepend "$HOME/bin" to PATH and export PATH is used for PATH executable lookup. It does not displace Run echo '$HOME' for the described requirement.

C:

The mechanisms are different: Single quotes prevent parameter expansion so the dollar-prefixed text remains literal. By contrast, PATH contains directories the shell searches when resolving external commands. They are not universally interchangeable.

D:

The third option addresses temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. The original action remains relevant because Single quotes prevent parameter expansion so the dollar-prefixed text remains literal.

Question 125

A filename variable holds report final.txt and a script must pass it as one argument to a command. Which action most directly addresses this requirement on a Linux-related system?

  1. Prepend "$HOME/bin" to PATH and export PATH
  2. Prefix that command with LANG=C on the same command line
  3. Run echo $? immediately after the command
  4. Write "$filename" when passing the variable

Explanation

Correct Answer

D:

Correct for double-quoted whitespace safety: Double-quoting parameter expansion prevents word splitting of spaces in the filename.

Incorrect Answers

A:

This action targets PATH executable lookup: PATH contains directories the shell searches when resolving external commands. The stated task instead calls for double-quoted whitespace safety.

B:

This action targets temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. The stated task instead calls for double-quoted whitespace safety.

C:

This action targets last exit code inspection: The special parameter $? expands to the most recently completed foreground command's exit status. The stated task instead calls for double-quoted whitespace safety.

Question 126

An operator follows this instruction: Write "$filename" when passing the variable. For the task described as "double-quoted whitespace safety", what is the most accurate expected result?

  1. Double-quoting parameter expansion prevents word splitting of spaces in the filename.
  2. PATH contains directories the shell searches when resolving external commands.
  3. A leading variable assignment applies to that command's environment rather than permanently changing the parent shell.
  4. The special parameter $? expands to the most recently completed foreground command's exit status.

Explanation

Correct Answer

A:

Correct consequence of Write "$filename" when passing the variable. This outcome explains its use for double-quoted whitespace safety.

Incorrect Answers

B:

This outcome belongs to PATH executable lookup and would follow Prepend "$HOME/bin" to PATH and export PATH; it is not the principal result of Write "$filename" when passing the variable.

C:

This outcome belongs to temporary assignment environment and would follow Prefix that command with LANG=C on the same command line; it is not the principal result of Write "$filename" when passing the variable.

D:

This outcome belongs to last exit code inspection and would follow Run echo $? immediately after the command; it is not the principal result of Write "$filename" when passing the variable.

Question 127

A filename variable holds report final.txt and a script must pass it as one argument to a command. A teammate tries this different approach instead: Prepend "$HOME/bin" to PATH and export PATH. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Prepend "$HOME/bin" to PATH and export PATH
  2. Write "$filename" when passing the variable
  3. Prefix that command with LANG=C on the same command line
  4. Run echo $? immediately after the command

Explanation

Correct Answer

B:

Replace the attempt with this step: Double-quoting parameter expansion prevents word splitting of spaces in the filename. It fits double-quoted whitespace safety.

Incorrect Answers

A:

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 double-quoted whitespace safety.

C:

This step is specific to temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. It does not fix the stated requirement for double-quoted whitespace safety.

D:

This step is specific to last exit code inspection: The special parameter $? expands to the most recently completed foreground command's exit status. It does not fix the stated requirement for double-quoted whitespace safety.

Question 128

A filename variable holds report final.txt and a script must pass it as one argument to a command. One student proposes Write "$filename" when passing the variable and another proposes Prefix that command with LANG=C on the same command line. Which technical comparison is the soundest?

  1. Prefix that command with LANG=C on the same command line is more directly suited to double-quoted whitespace safety than Write "$filename" when passing the variable, regardless of the stated constraint.
  2. The two actions are interchangeable for double-quoted whitespace safety and necessarily have the same main result.
  3. Write "$filename" when passing the variable is used because Double-quoting parameter expansion prevents word splitting of spaces in the filename. The alternative Prefix that command with LANG=C on the same command line addresses temporary assignment environment instead.
  4. Run echo $? immediately after the command is the only useful action for double-quoted whitespace safety; Write "$filename" when passing the variable has no relevant effect.

Explanation

Correct Answer

C:

Correct distinction: Write "$filename" when passing the variable targets double-quoted whitespace safety; Double-quoting parameter expansion prevents word splitting of spaces in the filename. The compared alternative instead serves temporary assignment environment.

Incorrect Answers

A:

Incorrect mapping: Prefix that command with LANG=C on the same command line is used for temporary assignment environment. It does not displace Write "$filename" when passing the variable for the described requirement.

B:

The mechanisms are different: Double-quoting parameter expansion prevents word splitting of spaces in the filename. By contrast, A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. They are not universally interchangeable.

D:

The third option addresses last exit code inspection: The special parameter $? expands to the most recently completed foreground command's exit status. The original action remains relevant because Double-quoting parameter expansion prevents word splitting of spaces in the filename.

Question 129

A custom utility in $HOME/bin is not found by its bare command name and the shell must search that directory. Which action most directly addresses this requirement on a Linux-related system?

  1. Prepend "$HOME/bin" to PATH and export PATH
  2. Prefix that command with LANG=C on the same command line
  3. Run echo $? immediately after the command
  4. Use ~/Documents as the path in the shell

Explanation

Correct Answer

A:

Correct for PATH executable lookup: PATH contains directories the shell searches when resolving external commands.

Incorrect Answers

B:

This action targets temporary assignment environment: A leading variable assignment applies to that command's environment rather than permanently changing the parent shell. The stated task instead calls for PATH executable lookup.

C:

This action targets last exit code inspection: The special parameter $? expands to the most recently completed foreground command's exit status. The stated task instead calls for PATH executable lookup.

D:

This action targets home directory tilde expansion: An unquoted leading tilde expands to the current user's home directory. The stated task instead calls for PATH executable lookup.

Question 130

An operator follows this instruction: Prepend "$HOME/bin" to PATH and export PATH. For the task described as "PATH executable lookup", what is the most accurate expected result?

  1. A leading variable assignment applies to that command's environment rather than permanently changing the parent shell.
  2. PATH contains directories the shell searches when resolving external commands.
  3. The special parameter $? expands to the most recently completed foreground command's exit status.
  4. An unquoted leading tilde expands to the current user's home directory.

Explanation

Correct Answer

B:

Correct consequence of Prepend "$HOME/bin" to PATH and export PATH. This outcome explains its use for PATH executable lookup.

Incorrect Answers

A:

This outcome belongs to temporary assignment environment and would follow Prefix that command with LANG=C on the same command line; it is not the principal result of Prepend "$HOME/bin" to PATH and export PATH.

C:

This outcome belongs to last exit code inspection and would follow Run echo $? immediately after the command; it is not the principal result of Prepend "$HOME/bin" to PATH and export PATH.

D:

This outcome belongs to home directory tilde expansion and would follow Use ~/Documents as the path in the shell; it is not the principal result of Prepend "$HOME/bin" to PATH and export PATH.