what is git-shell

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maruyama@mymachine:~ % cat /etc/shells
# List of acceptable shells for chpass(1).
# Ftpd will not allow users to connect who are not using
# one of these shells.

/bin/sh
/bin/csh
/bin/tcsh
/usr/local/bin/bash
/usr/local/bin/rbash
/usr/local/libexec/git-core/git-shell
/usr/local/bin/zsh
/usr/local/bin/rzsh
maruyama@mymachine:~ % which git-shell
/usr/local/bin/git-shell
maruyama@mymachine:~ % git-shell
fatal: Interactive git shell is not enabled.
hint: ~/git-shell-commands should exist and have read and execute access.
maruyama@mymachine:~ % pkg info -l git | grep git-shell
        /usr/local/bin/git-shell
        /usr/local/libexec/git-core/git-shell
        /usr/local/share/git-core/contrib/git-shell-commands/README
        /usr/local/share/git-core/contrib/git-shell-commands/help
        /usr/local/share/git-core/contrib/git-shell-commands/list
        /usr/local/share/man/man1/git-shell.1.gz
maruyama@mymachine:~ %

--------
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$B%a!<%k%"%I%l%9!'(B masa@amogha.jp