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The statement "CAPTCHAs can be used as a form of signature to create a valid contract in e-commerce. " is true. It is <span>a program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites.</span>
Answer:
rows and columns, or matrix
Explanation:
Two-dimensional 2D arrays are being indexed with the help of two subscripts. The first one is for the row and the second one if for the column. And each of the elements of the 2D array must be of the one kind like they all can be an object type or they all can be of primitive type.
Like:
int A[3][3];
The above is the 2-dimensional array in C++, and elements are of type int, which is a primitive data type.
Answer:
A. grep -E "(John|Bob)" salesemployees.csv
Explanation:
The grep command is used to search text. It searches the given file for lines containing a match to the given strings or words.
How to use Grep Command:
grep 'letter' filename – Search any line that contains word 'letter' in filename on Linux
grep -i 'Alphabet' file1 – A case-insensitive search for the word ‘Alphabet’ in Linux and Unix
grep -R 'root' . – Search all files in the current directory and in all of its subdirectories in Linux for the word ‘root’
