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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 29

Question 280

The log might contain warning, WARNING or Warning and all variants must be found. One student proposes Run grep -i 'warning' service.log and another proposes Run status_command through the pipe operator into grep 'active'. Which technical comparison is the soundest?

  1. Run grep -i 'warning' service.log is used because The -i flag makes grep ignore letter case when matching. The alternative Run status_command through the pipe operator into grep 'active' addresses pipeline matching output instead.
  2. Run status_command through the pipe operator into grep 'active' is more directly suited to case insensitive search than Run grep -i 'warning' service.log, regardless of the stated constraint.
  3. The two actions are interchangeable for case insensitive search and necessarily have the same main result.
  4. Run report_command > summary.txt is the only useful action for case insensitive search; Run grep -i 'warning' service.log has no relevant effect.

Explanation

Correct Answer

A:

Correct distinction: Run grep -i 'warning' service.log targets case insensitive search; The -i flag makes grep ignore letter case when matching. The compared alternative instead serves pipeline matching output.

Incorrect Answers

B:

Incorrect mapping: Run status_command through the pipe operator into grep 'active' is used for pipeline matching output. It does not displace Run grep -i 'warning' service.log for the described requirement.

C:

The mechanisms are different: The -i flag makes grep ignore letter case when matching. By contrast, The pipe sends standard output of the first command to grep for filtering. They are not universally interchangeable.

D:

The third option addresses overwrite output redirection: The > operator redirects standard output and truncates the target before writing. The original action remains relevant because The -i flag makes grep ignore letter case when matching.

Question 281

A developer wants matching TODO lines with original source-file line numbers. Which action most directly addresses this requirement on a Linux-related system?

  1. Run status_command through the pipe operator into grep 'active'
  2. Run report_command > summary.txt
  3. Run grep -n 'TODO' app.py
  4. Run report_command >> journal.txt

Explanation

Correct Answer

C:

Correct for line-numbered search results: The -n option prefixes matching lines with their line numbers.

Incorrect Answers

A:

This action targets pipeline matching output: The pipe sends standard output of the first command to grep for filtering. The stated task instead calls for line-numbered search results.

B:

This action targets overwrite output redirection: The > operator redirects standard output and truncates the target before writing. The stated task instead calls for line-numbered search results.

D:

This action targets append output redirection: The >> operator appends standard output to the destination file. The stated task instead calls for line-numbered search results.

Question 282

An operator follows this instruction: Run grep -n 'TODO' app.py. For the task described as "line-numbered search results", what is the most accurate expected result?

  1. The pipe sends standard output of the first command to grep for filtering.
  2. The > operator redirects standard output and truncates the target before writing.
  3. The >> operator appends standard output to the destination file.
  4. The -n option prefixes matching lines with their line numbers.

Explanation

Correct Answer

D:

Correct consequence of Run grep -n 'TODO' app.py. This outcome explains its use for line-numbered search results.

Incorrect Answers

A:

This outcome belongs to pipeline matching output and would follow Run status_command through the pipe operator into grep 'active'; it is not the principal result of Run grep -n 'TODO' app.py.

B:

This outcome belongs to overwrite output redirection and would follow Run report_command > summary.txt; it is not the principal result of Run grep -n 'TODO' app.py.

C:

This outcome belongs to append output redirection and would follow Run report_command >> journal.txt; it is not the principal result of Run grep -n 'TODO' app.py.

Question 283

A developer wants matching TODO lines with original source-file line numbers. A teammate tries this different approach instead: Run status_command through the pipe operator into grep 'active'. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Run grep -n 'TODO' app.py
  2. Run status_command through the pipe operator into grep 'active'
  3. Run report_command > summary.txt
  4. Run report_command >> journal.txt

Explanation

Correct Answer

A:

Replace the attempt with this step: The -n option prefixes matching lines with their line numbers. It fits line-numbered search results.

Incorrect Answers

B:

This step is specific to pipeline matching output: The pipe sends standard output of the first command to grep for filtering. It does not fix the stated requirement for line-numbered search results.

C:

This step is specific to overwrite output redirection: The > operator redirects standard output and truncates the target before writing. It does not fix the stated requirement for line-numbered search results.

D:

This step is specific to append output redirection: The >> operator appends standard output to the destination file. It does not fix the stated requirement for line-numbered search results.

Question 284

A developer wants matching TODO lines with original source-file line numbers. One student proposes Run grep -n 'TODO' app.py and another proposes Run report_command > summary.txt. Which technical comparison is the soundest?

  1. Run report_command > summary.txt is more directly suited to line-numbered search results than Run grep -n 'TODO' app.py, regardless of the stated constraint.
  2. Run grep -n 'TODO' app.py is used because The -n option prefixes matching lines with their line numbers. The alternative Run report_command > summary.txt addresses overwrite output redirection instead.
  3. The two actions are interchangeable for line-numbered search results and necessarily have the same main result.
  4. Run report_command >> journal.txt is the only useful action for line-numbered search results; Run grep -n 'TODO' app.py has no relevant effect.

Explanation

Correct Answer

B:

Correct distinction: Run grep -n 'TODO' app.py targets line-numbered search results; The -n option prefixes matching lines with their line numbers. The compared alternative instead serves overwrite output redirection.

Incorrect Answers

A:

Incorrect mapping: Run report_command > summary.txt is used for overwrite output redirection. It does not displace Run grep -n 'TODO' app.py for the described requirement.

C:

The mechanisms are different: The -n option prefixes matching lines with their line numbers. By contrast, The > operator redirects standard output and truncates the target before writing. They are not universally interchangeable.

D:

The third option addresses append output redirection: The >> operator appends standard output to the destination file. The original action remains relevant because The -n option prefixes matching lines with their line numbers.

Question 285

A system produces status text on stdout and a user wants only lines containing active. Which action most directly addresses this requirement on a Linux-related system?

  1. Run report_command > summary.txt
  2. Run report_command >> journal.txt
  3. Run command 2> errors.txt
  4. Run status_command through the pipe operator into grep 'active'

Explanation

Correct Answer

D:

Correct for pipeline matching output: The pipe sends standard output of the first command to grep for filtering.

Incorrect Answers

A:

This action targets overwrite output redirection: The > operator redirects standard output and truncates the target before writing. The stated task instead calls for pipeline matching output.

B:

This action targets append output redirection: The >> operator appends standard output to the destination file. The stated task instead calls for pipeline matching output.

C:

This action targets redirect error stream separately: File descriptor 2 is standard error and 2> redirects it independently of stdout. The stated task instead calls for pipeline matching output.

Question 286

An operator follows this instruction: Run status_command through the pipe operator into grep 'active'. For the task described as "pipeline matching output", what is the most accurate expected result?

  1. The pipe sends standard output of the first command to grep for filtering.
  2. The > operator redirects standard output and truncates the target before writing.
  3. The >> operator appends standard output to the destination file.
  4. File descriptor 2 is standard error and 2> redirects it independently of stdout.

Explanation

Correct Answer

A:

Correct consequence of Run status_command through the pipe operator into grep 'active'. This outcome explains its use for pipeline matching output.

Incorrect Answers

B:

This outcome belongs to overwrite output redirection and would follow Run report_command > summary.txt; it is not the principal result of Run status_command through the pipe operator into grep 'active'.

C:

This outcome belongs to append output redirection and would follow Run report_command >> journal.txt; it is not the principal result of Run status_command through the pipe operator into grep 'active'.

D:

This outcome belongs to redirect error stream separately and would follow Run command 2> errors.txt; it is not the principal result of Run status_command through the pipe operator into grep 'active'.

Question 287

A system produces status text on stdout and a user wants only lines containing active. A teammate tries this different approach instead: Run report_command > summary.txt. The requirement is still unmet. Which corrective action should replace the misapplied approach?

  1. Run report_command > summary.txt
  2. Run status_command through the pipe operator into grep 'active'
  3. Run report_command >> journal.txt
  4. Run command 2> errors.txt

Explanation

Correct Answer

B:

Replace the attempt with this step: The pipe sends standard output of the first command to grep for filtering. It fits pipeline matching output.

Incorrect Answers

A:

This step is specific to overwrite output redirection: The > operator redirects standard output and truncates the target before writing. It does not fix the stated requirement for pipeline matching output.

C:

This step is specific to append output redirection: The >> operator appends standard output to the destination file. It does not fix the stated requirement for pipeline matching output.

D:

This step is specific to redirect error stream separately: File descriptor 2 is standard error and 2> redirects it independently of stdout. It does not fix the stated requirement for pipeline matching output.

Question 288

A system produces status text on stdout and a user wants only lines containing active. One student proposes Run status_command through the pipe operator into grep 'active' and another proposes Run report_command >> journal.txt. Which technical comparison is the soundest?

  1. Run report_command >> journal.txt is more directly suited to pipeline matching output than Run status_command through the pipe operator into grep 'active', regardless of the stated constraint.
  2. The two actions are interchangeable for pipeline matching output and necessarily have the same main result.
  3. Run status_command through the pipe operator into grep 'active' is used because The pipe sends standard output of the first command to grep for filtering. The alternative Run report_command >> journal.txt addresses append output redirection instead.
  4. Run command 2> errors.txt is the only useful action for pipeline matching output; Run status_command through the pipe operator into grep 'active' has no relevant effect.

Explanation

Correct Answer

C:

Correct distinction: Run status_command through the pipe operator into grep 'active' targets pipeline matching output; The pipe sends standard output of the first command to grep for filtering. The compared alternative instead serves append output redirection.

Incorrect Answers

A:

Incorrect mapping: Run report_command >> journal.txt is used for append output redirection. It does not displace Run status_command through the pipe operator into grep 'active' for the described requirement.

B:

The mechanisms are different: The pipe sends standard output of the first command to grep for filtering. By contrast, The >> operator appends standard output to the destination file. They are not universally interchangeable.

D:

The third option addresses redirect error stream separately: File descriptor 2 is standard error and 2> redirects it independently of stdout. The original action remains relevant because The pipe sends standard output of the first command to grep for filtering.

Question 289

A report command must replace the previous contents of summary.txt with new stdout. Which action most directly addresses this requirement on a Linux-related system?

  1. Run report_command > summary.txt
  2. Run report_command >> journal.txt
  3. Run command 2> errors.txt
  4. Run cut -d: -f1 accounts.txt

Explanation

Correct Answer

A:

Correct for overwrite output redirection: The > operator redirects standard output and truncates the target before writing.

Incorrect Answers

B:

This action targets append output redirection: The >> operator appends standard output to the destination file. The stated task instead calls for overwrite output redirection.

C:

This action targets redirect error stream separately: File descriptor 2 is standard error and 2> redirects it independently of stdout. The stated task instead calls for overwrite output redirection.

D:

This action targets extract delimited column: cut uses colon as field delimiter and selects the first field. The stated task instead calls for overwrite output redirection.

Question 290

An operator follows this instruction: Run report_command > summary.txt. For the task described as "overwrite output redirection", what is the most accurate expected result?

  1. The >> operator appends standard output to the destination file.
  2. The > operator redirects standard output and truncates the target before writing.
  3. File descriptor 2 is standard error and 2> redirects it independently of stdout.
  4. cut uses colon as field delimiter and selects the first field.

Explanation

Correct Answer

B:

Correct consequence of Run report_command > summary.txt. This outcome explains its use for overwrite output redirection.

Incorrect Answers

A:

This outcome belongs to append output redirection and would follow Run report_command >> journal.txt; it is not the principal result of Run report_command > summary.txt.

C:

This outcome belongs to redirect error stream separately and would follow Run command 2> errors.txt; it is not the principal result of Run report_command > summary.txt.

D:

This outcome belongs to extract delimited column and would follow Run cut -d: -f1 accounts.txt; it is not the principal result of Run report_command > summary.txt.