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efficiency change to command hashing; fix pointer aliasing problem with readline history-search-backward

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Chet Ramey
2022-03-01 09:32:15 -05:00
parent e7a56619a2
commit 6c4a9a5cb7
12 changed files with 166 additions and 94 deletions
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doc/bashref.texi
+16 -2
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@@ -1600,10 +1600,22 @@ return status is the exit status of the last command executed
before the @code{return}.
Variables local to the function may be declared with the
@code{local} builtin. These variables are visible only to
@code{local} builtin (@dfn{local variables}).
Ordinarily, variables and their values
are shared between a function and its caller.
These variables are visible only to
the function and the commands it invokes. This is particularly
important when a shell function calls other functions.
In the following description, the @dfn{current scope} is a currently-
executing function.
Previous scopes consist of that function's caller and so on,
back to the "global" scope, where the shell is not executing
any shell function.
Consequently, a local variable at the current local scope is a variable
declared using the @code{local} or @code{declare} builtins in the
function that is currently executing.
Local variables "shadow" variables with the same name declared at
previous scopes. For instance, a local variable declared in a function
hides a global variable of the same name: references and assignments
@@ -1656,11 +1668,13 @@ variable is local to the current scope, @code{unset} will unset it;
otherwise the unset will refer to the variable found in any calling scope
as described above.
If a variable at the current local scope is unset, it will remain so
(appearing as unset)
until it is reset in that scope or until the function returns.
Once the function returns, any instance of the variable at a previous
scope will become visible.
If the unset acts on a variable at a previous scope, any instance of a
variable with that name that had been shadowed will become visible.
variable with that name that had been shadowed will become visible
(see below how @code{localvar_unset}shell option changes this behavior).
Function names and definitions may be listed with the
@option{-f} option to the @code{declare} (@code{typeset})