Linux Text Processing & Editors

Question 1

Which vim command saves the current file and exits the editor?

Accepted Answer

:wq

Answer

:wq writes (saves) the file and then quits vim in a single command.

Question 2

What does the `grep -i` flag do?

Accepted Answer

Performs a case-insensitive search

Answer

The -i flag tells grep to ignore case differences when matching patterns, so 'Hello' matches 'hello'.

Question 3

Which sed command replaces ALL occurrences of 'foo' with 'bar' on each line?

Accepted Answer

sed 's/foo/bar/g' file

Answer

The 'g' flag at the end of the sed substitution command makes it replace every occurrence on each line, not just the first.

Question 4

What does `awk '{print $2}' file` output?

Accepted Answer

The second field (column) of each line

Answer

In awk, $2 refers to the second whitespace-delimited field of each input record.

Question 5

Which command displays the last 10 lines of a file by default?

Accepted Answer

tail

Answer

The tail command shows the last 10 lines of a file by default; use -n to specify a different count.

Linux Practice Test