Enum Param 

#[non_exhaustive]
pub enum Param<'a> {
    Var(&'a str),
    Positional(u32),
    At,
    Star,
    Pound,
    Status,
    Pid,
    Bang,
    Dash,
}

A shell parameter reference.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Var(&'a str)

Named variable ($var).

Positional(u32)

Positional parameter ($1, $2, …).

At

$@ — all positional parameters (separate words).

Star

$* — all positional parameters (single word).

Pound

$# — number of positional parameters.

Status

$? — exit status of last command.

Pid

$$ — process ID.

Bang

$! — PID of last background process.

Dash

$- — current shell option flags.

Trait Implementations

impl<'a> Clone for Param<'a>

fn clone(&self) -> Param<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for Param<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Hash for Param<'a>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> PartialEq for Param<'a>

fn eq(&self, other: &Param<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Copy for Param<'a>

impl<'a> Eq for Param<'a>

impl<'a> StructuralPartialEq for Param<'a>