010-160 Searching and Extracting Data 4

Question 1

Which command would display only lines that do NOT match a pattern in grep?

Accepted Answer

grep -v pattern file

Answer

grep -v inverts the match, printing only lines that do not contain the pattern.

Question 2

What is the default field separator used by the `sort` command?

Accepted Answer

Whitespace

Answer

By default, sort treats any whitespace (spaces or tabs) as a field separator.

Question 3

Which sed command replaces only the first occurrence of 'foo' with 'bar' on each line?

Accepted Answer

sed 's/foo/bar/' file

Answer

Without the g flag, sed s/// replaces only the first match on each line.

Question 4

What does `head -n 20 file.txt` display?

Accepted Answer

The first 20 lines of file.txt

Answer

head -n 20 prints the first 20 lines of the specified file.

Question 5

Which command finds all files with the .conf extension under /etc?

Accepted Answer

find /etc -name '*.conf'

Answer

find /etc -name '*.conf' searches /etc for files whose names match the *.conf glob.

(010-160) LPI Linux Essentials Practice Test