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Wed, 05 Jun 2024 08:54:12 -0700 (PDT) MIME-Version: 1.0 References: <32c690d4-fe7f-4d89-ac99-829fa64cca15@eastlink.ca> <81576af9-80b3-4bcd-b23b-c0d67cff1870@eastlink.ca> <2603f68c-1e38-44a5-80e6-0bc6d3bb4d27@app.fastmail.com> <19c7bc51-5f28-4307-a0f7-35d0e2105811@eastlink.ca> <3ebb8929-cc5b-4174-a6c7-6c394afb0111@app.fastmail.com> <7d3f9a1e-f3c2-459a-b549-0432e649036d@eastlink.ca> In-Reply-To: <7d3f9a1e-f3c2-459a-b549-0432e649036d@eastlink.ca> From: "Mark J. Reed" Date: Wed, 5 Jun 2024 11:53:59 -0400 Message-ID: Subject: Re: history puzzle To: zsh-users@zsh.org Content-Type: multipart/alternative; boundary="000000000000e04f03061a269363" X-Seq: 30009 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: --000000000000e04f03061a269363 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Jun 4, 2024 at 10:01=E2=80=AFPM Ray Andrews wrote: > > > On 2024-06-04 17:33, Lawrence Vel=C3=A1zquez wrote: > > I was reading 'info zsh history' > > That shows the "History Expansion" section of the manual, which > does not mention the "history" builtin at all. > > > Ok, at least that's clear. I should be using 'info zshbuiltins'. > 'History Expansion' ... I'm taking that to be what the history command do= es > so ... actually now that I look closely, it's obviously the wrong place. > And 'run-help history' goes somewhere else entirely. > The term "history expansion" refers to the expansion of references into the command history. Those start with *!, *for example: *zsh% vi path/to/some/file* *zsh% gcc !$ # compile the file I just edited* In general, the *!* is followed by a selector that determines which item from the history you want to copy from. This can be an item number (which matches the one shown by *history*/*fc -l*), another *! *(which means the most recent command), or a prefix string (which refers to the most recent command starting with that prefix, e.g. *!ls* to refer to the most recent *ls* command). The selector can be followed by modifiers to restrict the expansion to just part of the command: *:0 *for the command name, *:** for the arguments without the command name, *:$* for just the last argument, etc. The *!!:$* expression (last word of the last command) is so common that it got its own shortcut, the *!$* I used above. History expansion is purely an interactive command-line feature; it doesn't work in scripts. If you need to access the history programmatically, use the *fc* command (or *history*, which is equivalent to *fc -l*). Anyway, that's what you were reading about. :) -- Mark J. Reed --000000000000e04f03061a269363 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Tue,= Jun 4, 2024 at 10:01=E2=80=AFPM Ray Andrews <rayandrews@eastlink.ca> wrote:
=
I was re= ading 'info zsh history' 
That shows the "History Expansion" section of the manu=
al, which
does not mention the "history" builtin at all.
Ok, at least that's clear.=C2=A0 I should be using 'info zshbui= ltins'.=C2=A0 'History Expansion' ... I'm taking that to be what the hist= ory command does so ... actually now that I look closely, it's obviousl= y the wrong place.=C2=A0 And 'run-help history' goes somewhere el= se entirely. =C2=A0=C2=A0

The term "history expansion" refers to the exp= ansion of references into the command history. Those start with=C2=A0!,= =C2=A0for example:

zsh% vi path/to/some/file
zsh% gcc !$ # compile the file I just edi= ted

In general, the=C2= =A0!=C2=A0is followed by a selector that determines which item from = the history you want to copy from. This can be an item number (which matche= s the one shown by=C2=A0history/fc -l), another=C2=A0!=C2= =A0(which means the most recent command), or a prefix string (which ref= ers to the most recent command starting with that prefix, e.g.=C2=A0!ls<= /b>=C2=A0to refer to the most recent=C2=A0ls=C2=A0command). The sele= ctor can be followed by modifiers to restrict the expansion to just part of= the command:=C2=A0:0=C2=A0for the command name,=C2=A0:*=C2= =A0for the arguments without the command name,=C2=A0:$=C2=A0for just= the last argument, etc. The=C2=A0!!:$=C2=A0expression (last word of= the last command) is so common that it got its own shortcut, the !$= =C2=A0I used above.

History e= xpansion is purely an interactive command-line feature; it doesn't work= in scripts. If you need to access the history programmatically, use the=C2= =A0fc=C2=A0command (or=C2=A0history, which is equivalent to= =C2=A0fc -l).=C2=A0
Anyway, that's= what you were reading about. :)
--
Mark J. Reed <markjreed@gmail.com>
--000000000000e04f03061a269363--