Linux script to launch a Unity Editor (installed from Unity Hub) for the specific project.

unity

#!/bin/bash

# Note that the shell option `nullglob` needs to be set. **It is not set by default.**
# It prevents an error in case the glob (or one of multiple globs) does not match any name.
shopt -s nullglob

PROJECT_DIR=$(realpath "$1")

if [ ! -d "$PROJECT_DIR" ]; then
    echo "Project directory is not valid: $1" >&2 &&\
    exit 1
fi

# Locked on to the speific Unity version.
UNITY_VERSION_FILTER="2020.3.*"
UNITY_EDITOR_DIRS=("$HOME"/Unity/Hub/Editor/${UNITY_VERSION_FILTER})

if [ ${#UNITY_EDITOR_DIRS} = 0 ]; then
    echo "Cannot find any Unity Editor version matching: \"${UNITY_VERSION_FILTER}\""
    exit 1
fi

# Select the latest version.
UNITY_EDITOR_DIR="${UNITY_EDITOR_DIRS[-1]}"
UNITY_EDITOR_VER=$(basename "$UNITY_EDITOR_DIR")
UNITY_EDITOR="$UNITY_EDITOR_DIR/Editor/Unity"

echo "Unity Editor $UNITY_EDITOR_VER"
echo "Opening project: $PROJECT_DIR"

# POSIX way of running a command detached.
# https://stackoverflow.com/a/10408906/3802890
#nohup "$UNITY_EDITOR" -projectPath "$PROJECT_DIR" </dev/null >/dev/null 2>&1 &

# Bash way of running a command detached.
"$UNITY_EDITOR" -projectPath "$PROJECT_DIR" &
disown