Final answer:
The command 'od' is used to display the octal value of text in Unix-like operating systems. 'od -b' displays the octal values of each byte of a file, which can be applied to text files.
Step-by-step explanation:
The command used to display the octal value of the text is not provided in the options listed. In Unix-like operating systems, the command od ('octal dump') is commonly used to display the octal values of the contents of a file, which includes text files. The command od -b specifically prints the octal values of each byte of a file.
For example, if you have a text file named example.txt, to see its octal representation, you could use the command:
od -b example.txt
This command would output the octal values corresponding to the file contents, allowing you to analyze or manipulate the data in octal format.