Question

What single flag to “cat”is equivalent to the flags “-v”, “-E” and “-T” all together, and what does this single flag do?

Answer 1

"-A" flag - displays all nonprinting symbols:

• for the end of line (LFD, '\n'), '$' is displayed
• for TAB ('\t'), '^I' is displayed
• for other nonprinting symbols, corresponding ^ and M- notation is used