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Fri, 12 Aug 2022 03:13:16 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-841-g7899e99a45-fm-20220811.002-g7899e99a Mime-Version: 1.0 Message-Id: <64b57144-d4af-4708-983b-0bd202557bbd@www.fastmail.com> In-Reply-To: References: Date: Fri, 12 Aug 2022 07:12:56 +0000 From: "Daniel Shahaf" To: =?UTF-8?Q?=C4=90o=C3=A0n_Tr=E1=BA=A7n_C=C3=B4ng_Danh?= , "Zach Riggle" Cc: "Zsh Users" Subject: Re: Overriding "builtin" Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Seq: 27943 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: =C4=90o=C3=A0n Tr=E1=BA=A7n C=C3=B4ng Danh wrote on Fri, 12 Aug 2022 02:= 24 +00:00: > On 2022-08-11 20:18:49-0500, Zach Riggle wrote: >> I recently learned that 'builtin' can be overridden with a function. = Neat >> for some silly tricks! >>=20 >> However, is there a way to save / restore 'builtin' such that it can = be >> restored? >>=20 >> All that I can think of is 'unfunction builtin', but 'unfunction' its= elf >> can be overridden with a function. > =C2=ABunset 'functions[unfunction]'=C2=BB, provided (zsh/parameter is av= ailable and) someone hasn't created an unset() function as well. > You can run original builtin with "builtin". > > e.g.: > > echo() { printf '++%s\n' "$@"; } > echo this will run function > builtin echo this will run builtin No, he can't, because in his case that'd be a bottomless recursive call (=3D an infinite loop).