cat

Question 1

cat

Answer 1

Concatenate FILE(s) to standard output.

Question 2

cat

• A
• b
• e
• E
• n

Answer 2

• A, –show-all, Equivalent to -vET.
• b, –number-nonblank, Number nonempty output lines, overrides -n.
• e, Equivalent to -vE.
• E, –show-ends, Display $ at end of each line.
• n, –number, Number all output lines.

Question 3

cat

• s
• t
• T
• u
• v

Answer 3

• s, –squeeze-blank, Suppress repeated empty output lines.
• t, Equivalent to -vT
• T, –show-tabs, Display TAB characters as ^I
• u (ignored)
• v, –show-nonprinting, Use ^ and M- notation, except for LFD and TAB