Question

linux basics

Regular expression that matches string which has arbitrary amount of a's (minimum of one) between k- characters. Ie. kak, kaak, kaaak, etc. Which of the following options is wrong? of of the following options is Select one: a, 'kaa b. 'ka+k' c. 'ka*k' Which of the following statements about sort fommand is true? Select one: a. sort can only sort data based on the characters at the beginning of the line b. You can select the the field which is used for sorting. The field separator can only be space or tabulator c. Any character can be used as a field separator. It can be defined with the option -t.

Answer 1

+ matches one or more characters.
* matches zero or more characters.
Option 2, 3 are correct because it says minimum one or more a characters. Option 2 is correct because ka+k means it matches 1 or more characters start with ka. Similarly, option 3 is correct because ka*k means it matches zero or more characters start with ka. But option 1, kaa*k means it matches any characters starts with 2 a's such that kaa. So, option A is wrong.

2. Option A is correct. sort command works by sorting the lines and with each character beginning of it.