Documented macOS multi-GitHub-account setup for fetch/push via separate SSH Hosts. | Dev Logs

Date: 2026-01-08 00:00 Summary: Documented macOS multi-GitHub-account setup for fetch/push via separate SSH Hosts.

[question] 有多个github账户，在mac上怎么配置fetch和push不同的账户

[try to solve] On macOS, the most reliable approach for multiple GitHub accounts is separate SSH keys and Host aliases.

Per-account SSH key + Host alias

1. Generate keys (example: work and personal):

ssh-keygen -t ed25519 -C "work@example.com" -f ~/.ssh/id_ed25519_work
ssh-keygen -t ed25519 -C "personal@example.com" -f ~/.ssh/id_ed25519_personal

2. Add each public key to the matching GitHub account (Settings → SSH and GPG keys).

3. Configure ~/.ssh/config:

Host github-work
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_ed25519_work
    AddKeysToAgent yes
    UseKeychain yes

Host github-personal
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_ed25519_personal
    AddKeysToAgent yes
    UseKeychain yes

4. Point each repo’s remote at the matching Host:

# Work repo
git remote set-url origin git@github-work:WorkOrg/repo.git

# Personal repo
git remote set-url origin git@github-personal:PersonalUser/repo.git

Fetch/push then pick the correct key via the Host alias.

Optional: per-repo author email

git config user.name "Your Name"
git config user.email "work@example.com"   # in the work repo
# Set personal email in the personal repo

HTTPS (not preferred for multi-account)

Possible via Keychain / host aliases / credential helpers, but SSH is simpler and recommended here.