Wildcards

Question 1

When can wildcards be used?

Answer 1

In whatever command that receives a file or a directory as an argument

Question 2

What is the * for when use in ls command?

Answer 2

It stands for match 0 or more characters

Question 3

How can you match exactly one character when using ls command (it doesn’t matter what character is)?

Answer 3

?

Question 4

How can we use a character class when using ls command?

Answer 4

with brackets [], an example for matching all the vowels is [aeiou]

Question 5

Does the character classes have a negation operand when using ls command?

Answer 5

Yes, if you do [!aeiou] it will match all the characters that are not the vowels.

Question 6

How can you specify a range with character classes when using ls command?

Answer 6

an example of a range is [1-6] this means any number from 1 to 6 (they are inclusive, meaning 1 and 6 also match).

Question 7

Name some named character classes when using ls command?

Answer 7

[[:alpha]], [[:digit]], [[:alnum]], [[:lower]], [[:upper]]

Question 8

How can we escape a character when using wildcards?

Answer 8

\