Designate special builtins as such in command -V and type.
Also document various properties of special builtins that we implement.

Approved by: ed (mentor) (implicit)

- Merge from HEAD

align coding style with style(9) to avoid misunderstandings

Report error messages of the builtins 'type' and 'command -V' to stderr instead
of stdout.

Noticed by: Zajcev Evgeny

Use eaccess() instead of access() for the type builtin, like we do for the
test builtin.

Submitted by: Martin Kammerhofer

Return an error status (127) from the builtins 'type' and 'command' (with
either -v or -V) if a file with a slash in the name doesn't exist (if there is
no slash we already did that).

Additionally,

Return an error status (127) from the builtins 'type' and 'command' (with
either -v or -V) if a file with a slash in the name doesn't exist (if there is
no slash we already did that).

Additionally, suppress the error message for command -v for files with a slash.

PR: 107674
Submitted by: Martin Kammerhofer

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Implement some of the differences between special built-ins and other builtins
demanded by POSIX.
- A redirection error is only fatal (meaning the execution of a shell script is
terminated) for spe

Implement some of the differences between special built-ins and other builtins
demanded by POSIX.
- A redirection error is only fatal (meaning the execution of a shell script is
terminated) for special built-ins. Previously it was fatal for all shell
builtins, causing problems like the one reported in PR 88845.
- Variable assignments remain in effect for special built-ins.
- Option or operand errors are only fatal for special built-ins.
This change also makes errors from 'fc' non-fatal (I could not find any reasons
for this behaviour).

Somewhat independently from the above down-grade the error handling in the
shift built-in if the operand is bigger than $# from an error() call (which is
now fatal) to a return 1. I'm not sure if this should be considered a POSIX
"operand error", however this change is needed for now as we trigger that error
while building libncurses. Comparing with other shells, zsh does the same as
our sh before this change (write a diagnostic, return 1), bash behaves as our
sh after this commit (no diagnostic, return 1) and ksh93 and NetBSD's sh treat
it as a fatal error.

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Add the POSIX options -v and -V to the 'command' builtin. Both describe the
type of their argument, if it is a shell function, an alias, a builtin, etc.
-V is more verbose than -v.

PR: 77259, 84539

Use prototypes in the MKINIT lines collected by mkinit.

Attempting to unset an undefined variable or function should not be
considered an error according to the Open Group Base Specification.

PR: standards/45738
Submitted by: Matthias Andree <matthias.a

Attempting to unset an undefined variable or function should not be
considered an error according to the Open Group Base Specification.

PR: standards/45738
Submitted by: Matthias Andree <matthias.andree@web.de>
MFC after: 3 days

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Remove clause 3 from the UCB licenses.

OK'ed by: imp, core

Changes following CScout analysis:

- Removed dead declarations
- Made objects that should have been declared as static, static.

The changes use STATIC instead of static, following the existing
conv

Changes following CScout analysis:

- Removed dead declarations
- Made objects that should have been declared as static, static.

The changes use STATIC instead of static, following the existing
convention in the rest of the code.

Approved by: schweikh (mentor)
MFC after: 2 weeks

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Restore "not found" error message when searching for (or executing)
a program fails because the file or a path component does not exist.

Suggested by: bde

Convert the remaining callers of errmsg() to use strerror(), and remove
errmsg() and its table of error messages.

Remove broken and incomplete support for old releases of System V,
don't support system that implement getcwd(3) with a pipe to /bin/pwd.

Consistently use FBSDID

Don't list shell builtins when the hash command is used (SUSv3)

Stop a null pointer dereference in the builtin hash function.

PR: 36141
Approved by: cracauer
MFC after: 1 week

o __P has been reoved
o Old-style K&R declarations have been converted to new C89 style
o register has been removed
o prototype for main() has been removed (gcc3 makes it an error)
o int main(int arg

o __P has been reoved
o Old-style K&R declarations have been converted to new C89 style
o register has been removed
o prototype for main() has been removed (gcc3 makes it an error)
o int main(int argc, char *argv[]) is the preferred main definition.
o Attempt to not break style(9) conformance for declarations more than
they already are.
o Change
int
foo() {
...
to
int
foo(void)
{
...

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Fix type builtin for absolute paths and relative paths with directory
names in them.

Also use a colon in the answer of `type` everytime the questioned item
is not usable.

PR: bin/20567

Fix command hash handling on
PATH=... command

Noted by and fix works for Marcel Moolenaar <marcel@scc.nl>

$Id$ -> $FreeBSD$

Add rcsid. Spelling.

Use the __unused attribute where warranted.

Add a type builtin and nuke register keyword usage.

Obtained from: NetBSD