Useful configuration for ~/.ssh/config File

ssh.config

# github is separated from company and other logins
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa_github

# dont have to remember the username
Host git-codecommit.*.amazonaws.com
  User awscodecommitusername
  IdentityFile ~/.ssh/id_rsa_aws

Host *.serverfarm.com 
  User blndev@whatever.co
  IdentityFile ~/.ssh/id_rsa_farm01

Host bastion-*.oslab.opentlc.com 
  User trainee17653
  IdentityFile ~/.ssh/id_rsa_farm01

Host *.cloudapp.microsoftazure.de 
  User blndev
  IdentityFile ~/.ssh/id_rsa_azure_generic

# simple access
# ssh t-shortcut
Host t-shortcut
  HostName a19986.germanycentral.cloudapp.microsoftazure.de
  User root
  IdentityFile ~/.ssh/id_rsa_azure_generic
  
Host *.company.org
  User a17321
  IdentityFile ~/.ssh/id_rsa_company

Host gitlab.company.org, gitlab
  HostName gitlab.company.org
  User a17321
  IdentityFile ~/.ssh/id_rsa_company