Which of the following characters can be combined with a separator string in order to read from the current input source until the separator string, which is on a separate line and without any trailing spaces, is reached?
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A. B. C. D.A
The character that can be combined with a separator string in order to read from the current input source until the separator string, which is on a separate line and without any trailing spaces, is reached is the "<<" character.
Therefore, the correct answer is (A) "<<"
This is known as the "here-document" or "here-doc" syntax in shell scripting. It is used to specify a block of input text within a script. The syntax allows you to input multiple lines of text until a specified delimiter is reached.
For example, suppose you want to create a file with some text in it using a script. Instead of manually typing in the text, you can use the here-doc syntax as follows:
shell$ cat > myfile.txt << END > This is the first line of my file. > This is the second line. > And this is the third. > END In the above example, "<< END" tells the shell to start reading input from the following lines until it sees the word "END" on a line by itself. The text between "<< END" and "END" is then written to the file "myfile.txt".
The separator string ("END" in the above example) can be any string you choose, as long as it does not contain any leading or trailing spaces.
So, option (A) "<<", is the correct answer to the question.