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3.2.1 Escapes

The escapes that ‘-printf’ and ‘-fprintf’ recognise are:

Alarm bell.
Stop printing from this format immediately and flush the output.
Form feed.
Carriage return.
Horizontal tab.
Vertical tab.
A literal backslash (‘\’).
The character whose ASCII code is NNN (octal).

A ‘\’ character followed by any other character is treated as an ordinary character, so they both are printed, and a warning message is printed to the standard error output (because it was probably a typo).