How to switch accounts for multiple Gits from the same PC

It depends on whether you use SSH or HTTPS...

If this problem occurs with HTTPS, I think the credential helper remembers the credentials (username/password).In this case, you can have another credential stored by putting the username in the URL.

 git clone https://github.com/user_a/aprojectX
 ↓
git clone https://[email protected] /user_a/aprojectX

See also

• Git push to github results in 403 error-stack overflow
• How can I store keychain credentials for multiple Github accounts?- Stack Overflow

In this case, the user is identified by the private key and must use the private key differently.

Depending on your environment, if you use git push/pull in the command, you are probably using openssh for SSH connections.Then you can specify a private key for each destination in .ssh/config.

For example, .ssh/config should include:

Host github-private
    HostName github.com
    IdentityFile~/.ssh/id_rsa_private

If you use the github-private determined above instead of github.com as the hostname,

 git clone [email protected]:user_a/projectX
 ↓
git clone git @github-private:user_a/projectX

~/.ssh/id_rsa is used instead of ~/.ssh/id_rsa_private.

For Github only,

• Register a work account as a Collaborator in a private repository
• Register your work public key to your private account (if SSH)

and so on.

See also

• Multiple GitHub Accounts & SSH Config-Stack Overflow

You can rewrite the URL you want to clone by hand, or, for example, if you want to apply it to a Github user, you can automatically replace it by generating the entry url.<base>.insteadOf in gitconfig.You can replace it from the HTTPS URL.

 [url"git@github-private:user_a/"]
    installOf=https://github.com/user_a/

Note Rewrite Git Repository URL Settings "insteadOf" and "pushInsteadOf"-kakakakukublog

In either way, the name and email at the time of commitment must be changed separately.This is a function called conditional inclusions, and you might want to set it to ~/private/ and below to apply this gitconfig...

Reference Use includeIf to replace git config for each project - kakakaku blog

There is no description of the operating system, but how about dividing the users on the operating system?

As @unarist states, github passes SSH (public) keys registered with github as authentication and then performs authorization logic, causing this problem because of the git protocol.

In @unarist's answer, ~/.ssh/config provides a way to configure host settings for each key and git clone with that name, which is a little inconvenient because you have to change the host name for each account.

A recent method I do is to set the GIT_SSH_COMMAND environment variable introduced in git 2.3 or later.For example, set the environment variables as follows:

export GIT_SSH_COMMAND='ssh-i~/.ssh/another-account-key'

By enabling this setting only in a specific working directory where you want to use this account, such as using direnv, you can consolidate the repositories that you want to access under that directory and run the git clone in the usual flow.

For your reference, GIT_SSH_COMMAND is an environment variable that instructs git to replace the internal ssh command with the specified command.

For your information, using the Pro version of GitKraken, it seems that you can switch between multiple accounts.
(GUI Client for Windows, Mac, and Linux)

Frequently Asked Questions

How can I use multiple GitHub/Bitbucket accounts with GitKraken?
However, with GitKraken Pro's multiple profile support, you can easily switch between profiles that each have their own associated GitHub and BitBucket accounts.