Git configuration for multiple identities

.gitconfig

; put this content into ~/.gitconfig

[core]
  editor = 'code' --wait

[url "ssh://redirect-to-somewhere"]
  insteadOf = https://scm-git-private.server.com/

[alias]
  ; https://dev.to/nishina555/how-to-ignore-files-already-managed-with-git-locally-19oo
  ; ignore files, assumes change locally, git will not manage it
  ignore = update-index --skip-worktree
  unignore = update-index --no-skip-worktree
  ignored = !git ls-files -v | grep "^S"

  ; ignore files, assumes unchanged locally
  untrack = update-index --assume-changed
  retrack = update-index --no-assume-changed
  untracked = !git ls-files -v | grep "^h"

  ; others
  lastchange = show
  aliases = config --global --get-regexp ^alias\\.

; Company
[includeIf "gitdir/i:~/workspace/company/"]
  path = ~/.gitconfig.company

; Personal
[includeIf "gitdir/i:~/workspace/me/"]
  path = ~/.gitconfig.me

multiple ssh creds for git.md

1. Generate ssh keys by following one of these tutorials:

Bitbucket tutorial

Gitlab tutorial

Github tutorial

2. After added SSH keys successfully, you should check by listing ssh keys:

ssh-add -l

3. Configure ~/.ssh/config:

# Work
Host git.company.com
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/id_rsa

# Personal
Host github.com gitlab.com bitbucket.org
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/id_rsa_individual

4. Test added SSH keys

ssh -T git@git.company.com

ssh -T git@gitlab.com
ssh -T git@bitbucket.org
ssh -T git@github.com