Unquotes a string as the shell (/bin/sh) would.
Only handles quotes; if a string contains file globs, arithmetic operators, variables, backticks, redirections, or other
special-to-the-shell features, the result will be different from the result a real shell would produce (the variables, backticks, etc.
will be passed through literally instead of being expanded). This function is guaranteed to succeed if applied to the result of
quote. If it fails, it returns null and
sets the error. The quoted_string need not actually contain quoted or escaped text; unquote
simply goes through the string and unquotes/unescapes anything that the shell would. Both single and double quotes are handled, as are
escapes including escaped newlines. The return value must be freed with g_free. Possible
errors are in the ShellError domain.
Shell quoting rules are a bit strange. Single quotes preserve the literal string exactly. escape sequences are not allowed; not even \' - if you want a ' in the quoted text, you have to do something like 'foo'\''bar'. Double quotes allow $, `, ", \, and newline to be escaped with backslash. Otherwise double quotes preserve things literally.
| quoted_string |
shell-quoted string |
|
an unquoted string |