pub fn parse_echo_args(args: &[String]) -> (EchoConfig, &[String])Expand description
Parse the raw command-line arguments (after the program name) into an
EchoConfig and the remaining text arguments.
GNU echo uses manual flag parsing: a leading argument is only treated as
flags if it starts with - and every subsequent character is one of n,
e, or E. Combined flags like -neE are valid. Anything else (e.g.
-z, --foo, or even -) is treated as a normal text argument.
When POSIXLY_CORRECT is set, escapes are always interpreted.
GNU coreutils 9.x: if the FIRST arg is exactly “-n”, recognize it and
subsequent option-like args (including combined flags like -nE, -ne).
Only -n has effect (suppress newline); -e/-E are consumed but ignored
(escapes stay on). If the first arg is NOT “-n”, no options recognized.