尝试安装Homebrew遇语法错误：执行brew_instal.sh脚本报错

Alright, let’s tackle that syntax error you’re hitting when trying to run the Homebrew install script. The error pointing to have_sudo_access() { on line 61 is usually caused by a small formatting issue or hidden character throwing off bash’s parser. Here’s how to fix it:

1. Check for Hidden Special Characters or Broken Line Endings #

The error message calls out '{ '—notice that space after the curly brace? Or maybe there’s an invisible character (like a full-width space from copy-pasting) or Windows-style line breaks (CRLF instead of Unix LF) messing things up.

• Fix line endings: If you edited the script on Windows, convert it to Unix-style endings. On macOS, run:

  sed -i '' 's/\r$//' brew_instal.sh
  

  On Linux, use:

  dos2unix brew_instal.sh
  

  (Install dos2unix first with sudo apt install dos2unix if you don’t have it.)
• Spot hidden characters: Run cat -A brew_instal.sh in your terminal—this shows all invisible characters. Look at line 61: if you see anything weird before/after the { (like ^M for Windows line breaks or non-standard spaces), delete those and replace with regular spaces.

2. Double-Check the Line Before the Function #

Sometimes a syntax error in the line right before the function causes bash to throw an error on the function line instead. Looking at your code snippet, the line before have_sudo_access() is:

tty_reset="$(tty_escape 0)"

Make sure the tty_escape function is properly defined earlier in the script—if that function has a typo or missing syntax, it can break the parser before it gets to line 61.

3. Use the Official Homebrew Install Script (Easiest Fix) #

If you modified the script or it got corrupted during download, skip the hassle and use the official, tested version:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

This pulls the latest working script directly from Homebrew’s repo, so you won’t have to debug syntax issues in a modified file.

4. Verify Your Bash Version #

Older bash versions might struggle with modern syntax. Run bash --version—Homebrew requires bash 3.2 or newer (which is standard on macOS and most Linux distros). If you’re on an ancient system, upgrade bash first before trying again.

Give these steps a shot—odds are it’s a tiny formatting fix that’ll get you up and running with Homebrew. If you still hit snags, share the full lines around 60-65 of your script and we can dig deeper.

内容的提问来源于stack exchange，提问作者E001