BASH script that downloads and installs Claude Mac App & the CLI client via npm

install-claude-app-cli

#!/usr/bin/env bash
# shellcheck disable=SC2154,SC1091,SC1090
# vim: ft=bash
# 
# AUTHOR:
#   © 2025 Konstantin Gredeskoul, All rights reserved. 
# LICENSE: 
#   MIT
# USAGE: 
#   Download the script to a local file called "install-claude-app-cli" and then:
#   bash install-claude-app-cli

declare dmg url mnt 

export dmg=Claude.dmg	
export url="https://storage.googleapis.com/osprey-downloads-c02f6a0d-347c-492b-a752-3e0651722e97/nest/$dmg"
export mnt="/Volumes/Claude"

# shellcheck disable=SC2064
trap "rm -f ${dmg}" EXIT

if [[ ! -d "${HOME}/.bashmatic" ]] ; then 
  bash -c "$(curl -fsSL https://bashmatic.re1.re); bashmatic-install -q"
fi

[[ -f "${HOME}/.bashmatic/init" ]] && source "${HOME}/.bashmatic/init" >/dev/null

function app-size() {
	local app_path="$1"
	du -sh "$app_path" | awk '{printf "%s", $1}'
}

function wait-for-command() {
	local command="$1"
	local timeout="$2"
	local interval="$3"
	local elapsed=0.0

	while ! eval "$command" >/dev/null 2>&1; do
		sleep "$interval"	
		elapsed=$(echo "$elapsed + $interval" | bc)
		if [[ $(echo "$elapsed >= $timeout" | bc) -eq 1 ]]; then
			error "Reached timeout ($timeout seconds) waiting for $command to complete..."
			return 1
		fi
	done
}

function install-deps() {
  h2 "Checking for Brew, and will install it if not there."
  command -v brew >/dev/null || /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  run "brew bundle"
	command -v volta && volta setup
	for file in $(util.shell-init-files) ; do
		[[ -f ${file} ]] && {
			# shellcheck disable=SC1090
			source "${file}"
			break
		}
	done
  run "volta install node"
  run "volta pin node"
  run "volta install yarn"
  run "volta pin yarn"
}

if [[ -d /Applications/Claude.app ]] && command -v claude >/dev/null; then
	# shellcheck disable=SC2154
	h1 "Claude.app is already installed. To re-install please run:" \
  	 "${txtylw}rm -rf /Applications/Claude.app"
	exit 0
fi

install-deps

[[ -s $dmg ]] && {
	warning "Re-downloading $dmg even though a local copy exists..."
  run.set-next show-output-on
	run "rm -fv Claude.dmg*"
}

run.set-all abort-on-error show-output-off
run.set-next show-output-on

if [[ -d $mnt ]]; then
	warning "Claude mount point $mnt already exists, unmounting it..."
	run "diskutil unmount $mnt"
fi

run "wget --show-progress $url"

if [[ -s $dmg ]] ; then
	h5 "Opening $dmg... Please wait..."
  open $dmg >/dev/null 2>&1 &
	progress.bar.auto-run 1.5
	wait-for-command "test -d $mnt && test -d $mnt/Claude.app" 5.0 0.2 || {
		error "Timeout waiting for $dmg to be mounted..."
		exit 4
	}
else
	error "Can't find $dmg after downloading it." "Source URL was [$url]"
	exit 2
fi

declare app_size current_size

if [[ -d "${mnt}" && -d "${mnt}/Claude.app" ]]; then
	app_size=$(app-size "${mnt}/Claude.app")
	info "Total size of Claude.app is: ${bldylw}${app_size}"
	success "Claude DMG was successfully mounted in $mnt..."
else
	error "Failed mounting $dmg, no directory $mnt were found."
	exit 3
fi

h2bg "Installing Claude.app to /Applications...."
run "cp -rp $mnt/Claude.app /Applications"

h4 "Unmounting $dmg..."
run "diskutil unmount $mnt"

[[ -d /Applications/Claude.app ]] && command -v claude >/dev/null && {
	current_size=$(app-size /Applications/Claude.app)
	success "Claude.app is installed in /Applications"
	echo
	h3bg "Total size of the installed /Applications/Claude.app is: ${bldylw}${current_size}"
	echo
	sleep 1
	h4bg "To start the Desktop Mac App, run ${txtgrn}${bakylw} open /Applications/Claude.app " \
	     "To run the CLI session in the terminal, run ${txtgrn}${bakylw} claude --help "
}