What does the ?symbol mean in the following grep regular expression: grep ‘^d[aei]?d$’ /usr/share/dict/words
A. Match the preceding character set ([aei]) one or more times.
B. Match the preceding character set ([aei]) zero or more times.
C. Match the preceding character set ([aei]) zero or one times.
D. Match a literal ?symbol.
|
Download Printable PDF. VALID exam to help you PASS. |
 |