010-160 Searching and Extracting Data 5

Question 1

Which grep option uses extended regular expressions without needing to escape special characters like `+` or `|`?

Accepted Answer

grep -E

Answer

grep -E (or egrep) enables extended regular expressions, allowing unescaped use of +, |, (, and ).

Question 2

What does `find . -type d` search for?

Accepted Answer

Directories only

Answer

The -type d predicate restricts find results to directories.

Question 3

Which command sorts a file numerically by the second field, using a comma as delimiter?

Accepted Answer

sort -t, -k2 -n file

Answer

sort -t, sets comma as delimiter, -k2 selects the second field, and -n sorts numerically.

Question 4

What is the effect of `tr -d '
'` on its input?

Accepted Answer

Deletes all newline characters from the input

Answer

tr -d deletes every occurrence of the specified character; here it removes all newline characters.

Question 5

Which command finds files that were accessed more than 7 days ago?

Accepted Answer

find . -atime +7

Answer

find -atime +7 finds files whose last access time was more than 7 days ago.

(010-160) LPI Linux Essentials Practice Test