签出每个git子模块中的一个特定分支

我正在尝试为git编写一个别名，它将接受分支名称，并在每个子模块中递归地签出它。预计某些子模块可能没有此分支，因此将跳过它们

我尝试了这个解决方案：

[alias]
subco = "!f() { git submodule foreach 'git checkout $1 || true'; }; f"

位它给我错误，$1-输入不正确

Entering 'Services/Payment'
error: pathspec 'git' did not match any file(s) known to git.
error: pathspec 'checkout' did not match any file(s) known to git.
error: pathspec '$1' did not match any file(s) known to git.
error: pathspec '||' did not match any file(s) known to git.
error: pathspec 'true' did not match any file(s) known to git.

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我试图在引号中加上$1，但没有用，ant建议？

发现错误，输入$1应在引号之外：

[alias]
subco = "!f() { git submodule foreach 'git checkout '$1' || true'; }; f"