[jolmg]

Seems it's to allow implicit and explicit use of arguments passed to alias. Git does the following to the alias string[1]:

  argv_array_pushf(out, "%s \"$@\"", argv[0]);

So, you can have aliases like `!grep foobar` to automatically accept arguments or aliases like yours that use arguments explicitly.

I've done aliases like `!bash -c 'foo $1' sh` before, but on seeing yours, I see that it was unnecessary to re-wrap with bash.

[1] https://github.com/git/git/blob/e31aba42fb12bdeb0f850829e008...

[lilyball]

Huh I had no idea $1/$2/etc worked as-is in an alias. The advice I learned years ago for dealing with any alias that needs to do something custom with parameters is to write it like

  git config alias.foo '!f() { actual command goes here }; f'

as that will pass all the args to the shell function. But if git is already setting it up so the args work then suffixing the alias with ";:" seems simpler.

[jolmg]

> The advice I learned years ago

Being able to use $1/$2/etc directly might be a relatively new development.

EDIT: Or maybe not. This might have been doable since 2010:

https://github.com/git/git/commit/8dba1e634af1d973a47fca616a...

[lilyball]

2010 is still “new development” to me

[varl]

Interesting! Thanks for digging up the code.