"Commnad not found" after installing a formulae

[jsx97]

Output of brew config

HOMEBREW_VERSION: 4.3.3
ORIGIN: https://github.com/Homebrew/brew
HEAD: e130e47f23b8b806096f9ec4f2c193213b8ec908
Last commit: 6 days ago
Core tap JSON: 08 Jun 10:47 UTC
Core cask tap JSON: 08 Jun 10:47 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 10
Homebrew Ruby: 3.3.2 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.2/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 15.0.0 build 1500
Git: 2.39.3 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 8.6.0 => /usr/bin/curl
macOS: 14.5-arm64
CLT: 15.3.0.0.1.1708646388
Xcode: 15.1
Rosetta 2: false

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:
  wkhtmltopdf

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected dylibs:
  /usr/local/lib/libwkhtmltox.0.12.6.dylib

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected header files:
  /usr/local/include/wkhtmltox/image.h
  /usr/local/include/wkhtmltox/pdf.h

Description of issue

I tried install https://formulae.brew.sh/formula/djview4.

The installation was without any errors or warnings, but when I try to do, for example,

djview4 my_file.djvu

or

djview4 -help

there is an error:

zsh: command not found: djview4

Replacing djview4 with djview solves both issues, but as far as I know, djview and djview4 are two different utils.

[gromgit]

What's the output of brew info djview djview4?

[jsx97]

Hello, Adrian!

==> djview: 4.12,3.5.28,2
https://djvu.sourceforge.net/
Not installed
From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/d/djview.rb
==> Name
DjView
==> Description
DjVu viewer and browser plugin
==> Artifacts
DjView.app (App)
==> Analytics
install: 71 (30 days), 236 (90 days), 853 (365 days)

==> djview4: stable 4.12 (bottled)
Viewer for the DjVu image format
https://djvu.sourceforge.net/djview4.html
Installed
/opt/homebrew/Cellar/djview4/4.12_2 (17 files, 1.4MB) *
  Poured from bottle using the formulae.brew.sh API on 2024-06-08 at 10:25:45
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/d/djview4.rb
License: GPL-2.0-or-later
==> Dependencies
Build: autoconf ✘, automake ✘, libtool ✔, pkg-config ✘
Required: djvulibre ✔, qt@5 ✔
==> Analytics
install: 56 (30 days), 259 (90 days), 1,048 (365 days)
install-on-request: 56 (30 days), 259 (90 days), 1,048 (365 days)
build-error: 0 (30 days)

[gromgit]

Never mind, finally got around to installing djview4 (the qt@5 dependency is WAY too expensive to install over a mobile data connection). Note the following:

$ brew ls djview4
/opt/homebrew/Cellar/djview4/4.12_2/bin/djview
/opt/homebrew/Cellar/djview4/4.12_2/djview.app/Contents/ (7 files)
/opt/homebrew/Cellar/djview4/4.12_2/sbom.spdx.json

i.e. the binary installed by the djview4 formula is in fact djview.

as far as I know, djview and djview4 are two different utils.

You might be thinking of the djview cask, which install the DjView.app macOS application bundle.

[jsx97]

Many thanks, Adrian!