patch outputs a file name in a diagnostic message, it
can format the name in any of several ways. This can be useful to
output file names unambiguously, even if they contain punctuation or
special characters like newlines. The
--quoting-style=word option controls how names are
output. The word should be one of the following:
Output names as-is.
Quote names for the shell if they contain shell metacharacters or would cause ambiguous output.
Quote names for the shell, even if they would normally not require quoting.
Quote names as for a C language string.
Quote as with ‘c’ except omit the surrounding double-quote characters.
You can specify the default value of the --quoting-style
option with the environment variable
QUOTING_STYLE. If that
environment variable is not set, the default value is ‘shell’,
but this default may change in a future version of