Git - Revision history

Ardika Sulistija at 15:26, 8 December 2025

2025-12-08T15:26:41Z

← Older revision		Revision as of 15:26, 8 December 2025
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	https://github.com/git-guides		https://github.com/git-guides


	====Git Cheat Sheet====		====Git Cheat Sheet====

Ardika Sulistija at 15:26, 8 December 2025

2025-12-08T15:26:34Z

← Older revision		Revision as of 15:26, 8 December 2025
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	https://github.com/git-guides		https://github.com/git-guides

			====Git Cheat Sheet====
			----

			https://git-scm.com/cheat-sheet


	====How to clone github repository to your local terminal====		====How to clone github repository to your local terminal====

Ardika Sulistija: /* Why does it appear to have two ssh key's set up on my system? */

2025-02-25T05:09:47Z

Why does it appear to have two ssh key's set up on my system?

← Older revision		Revision as of 05:09, 25 February 2025
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	** The second <b>Host github.com</b> block sets the SSH key to <b>~/.ssh/ads9055_github</b>, but it overrides the first one.		** The second <b>Host github.com</b> block sets the SSH key to <b>~/.ssh/ads9055_github</b>, but it overrides the first one.
	** Since both blocks use Host github.com, SSH always applies the last one in the file.		** Since both blocks use Host github.com, SSH always applies the last one in the file.
	* <b>HOW TO FIX THIS</b>		* [[#Using_Multiple_SSH_Keys_for_GitHub_on_One_Machine\|<b>HOW TO FIX THIS</b>]]


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	5. To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:		5. To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:
	ssh -vT git@github.com		ssh -vT git@github.com


	====Using Multiple SSH Keys for GitHub on One Machine====		====Using Multiple SSH Keys for GitHub on One Machine====

Ardika Sulistija: /* Using Multiple SSH Keys for GitHub on One Machine */

2025-02-25T05:08:12Z

Using Multiple SSH Keys for GitHub on One Machine

← Older revision		Revision as of 05:08, 25 February 2025
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	git remote set-url origin git@github-work:ads9055/cs-gy-6843.git		git remote set-url origin git@github-work:ads9055/cs-gy-6843.git

	<u>How to Verify Which SSH Key is Used</u>		<u>How to Verify Which SSH Key is Used</u><br>
	You can now test which key is being used by running:		You can now test which key is being used by running:
	ssh -T git@github-personal		ssh -T git@github-personal

Ardika Sulistija: /* Using Multiple SSH Keys for GitHub on One Machine */

2025-02-25T05:07:58Z

Using Multiple SSH Keys for GitHub on One Machine

← Older revision		Revision as of 05:07, 25 February 2025
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	IdentityFile ~/.ssh/ads9055_github		IdentityFile ~/.ssh/ads9055_github

	<u>How to Use These Identities in Git</u>		<u>How to Use These Identities in Git</u><br>
	Since we've renamed the Host values (github.com → github-personal and github.com → github-school), you need to update your remote URLs in your repositories:		Since we've renamed the Host values (github.com → github-personal and github.com → github-school), you need to update your remote URLs in your repositories:

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	This setup ensures that: ✅ Personal GitHub (personal) uses ~/.ssh/id_ed25519.		This setup ensures that: ✅ Personal GitHub (personal) uses ~/.ssh/id_ed25519.
	✅ School GitHub (school) uses ~/.ssh/ads9055_github.		✅ School GitHub (school) uses ~/.ssh/ads9055_github.


	====How to commit/upload to git====		====How to commit/upload to git====

Ardika Sulistija at 05:07, 25 February 2025

2025-02-25T05:07:36Z

@@ Line 78: / Line 78: @@
-=====<u>Why does my macos appear to have two ssh key's set up on my system?</u>=====
+=====<u>Why does it appear to have two ssh key's set up on my system?</u>=====
   ardikas-mbp:cs-gy-6843 ardika$ ../github-ssh.sh
@@ Line 136: / Line 136: @@
 . To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:
   ssh -vT git@github.com
 ====How to commit/upload to git====

Ardika Sulistija: /* Why does my macos appear to have two ssh key's set up on my system? */

2025-02-25T05:01:35Z

Why does my macos appear to have two ssh key's set up on my system?

← Older revision		Revision as of 05:01, 25 February 2025
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	IdentityFile ~/.ssh/ads9055_github		IdentityFile ~/.ssh/ads9055_github
	* If you have two SSH keys mapped to GitHub, one may be used by default, and another when explicitly specified.		* If you have two SSH keys mapped to GitHub, one may be used by default, and another when explicitly specified.
			* Your issue comes from having two <b>Host github.com</b> entries in your ~/.ssh/config file. What's Happening?
			** The first <b>Host github.com</b> block sets the SSH key to <b>~/.ssh/id_ed25519</b>.
			** The second <b>Host github.com</b> block sets the SSH key to <b>~/.ssh/ads9055_github</b>, but it overrides the first one.
			** Since both blocks use Host github.com, SSH always applies the last one in the file.
			* <b>HOW TO FIX THIS</b>


	3. <b>Multiple GitHub Accounts</b>		3. <b>Multiple GitHub Accounts</b>

Ardika Sulistija: /* Why does my macos appear to have two ssh key's set up on my system? */

2025-02-25T04:57:29Z

Why does my macos appear to have two ssh key's set up on my system?

← Older revision		Revision as of 04:57, 25 February 2025
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	UseKeychain yes		UseKeychain yes
	IdentityFile ~/.ssh/id_ed25519		IdentityFile ~/.ssh/id_ed25519

	# Other GitHub account (school)		# Other GitHub account (school)
	Host github.com		Host github.com
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	ssh-add ~/.ssh/github_rsa # Load only a specific key		ssh-add ~/.ssh/github_rsa # Load only a specific key

			5. To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:
	6. To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:
	ssh -vT git@github.com		ssh -vT git@github.com

Ardika Sulistija at 04:53, 25 February 2025

2025-02-25T04:53:35Z

← Older revision		Revision as of 04:53, 25 February 2025
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	cat ~/.ssh/config		cat ~/.ssh/config
	* Example config file:		* Example config file:
			$ cat ~/.ssh/config
			# Default GitHub account (personal)
	Host github.com		Host github.com
	User git		HostName github.com
	IdentityFile ~/.ssh/~~github_rsa~~		User git
			AddKeysToAgent yes
	Host github~~-work~~		UseKeychain yes
	~~Hostname~~ github.com		IdentityFile ~/.ssh/id_ed25519
	User git
	IdentityFile ~/.ssh/~~work_rsa~~		# Other GitHub account (school)
			Host github.com
			HostName github.com
			User git
			AddKeysToAgent yes
			UseKeychain yes
			IdentityFile ~/.ssh/ads9055_github
	* If you have two SSH keys mapped to GitHub, one may be used by default, and another when explicitly specified.		* If you have two SSH keys mapped to GitHub, one may be used by default, and another when explicitly specified.

Ardika Sulistija: /* How to add SSH key and push using SSH */

2025-02-25T04:48:46Z

How to add SSH key and push using SSH

← Older revision		Revision as of 04:48, 25 February 2025
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	* [new branch] main -> main		* [new branch] main -> main


			=====<u>Why does my macos appear to have two ssh key's set up on my system?</u>=====

			ardikas-mbp:cs-gy-6843 ardika$ ../github-ssh.sh
			Agent pid 12617
			Enter passphrase for /Users/Ardika/.ssh/ads9055_github:
			Identity added: /Users/Ardika/.ssh/ads9055_github (ads9055@nyu.edu)
			Hi ads9055! You've successfully authenticated, but GitHub does not provide shell access.

			ardikas-mbp:cs-gy-6843 ardika$ ssh -T git@github.com
			Hi ardikas! You've successfully authenticated, but GitHub does not provide shell access.

			Your system appears to have two different SSH keys because SSH is likely using different identities depending on how it's configured. This happens for a few reasons:

			1. <b>Multiple SSH Keys in ~/.ssh Directory</b> - Check how many SSH keys you have stored:
			ls -l ~/.ssh/
			* If you see multiple private keys (e.g., id_rsa, id_ecdsa, id_ed25519, github_rsa), your system may be using different keys for different connections.

			2. <b>SSH Config File (~/.ssh/config)</b> - Your ~/.ssh/config file may specify different SSH identities for GitHub. Run:
			cat ~/.ssh/config
			* Example config file:
			Host github.com
			User git
			IdentityFile ~/.ssh/github_rsa

			Host github-work
			Hostname github.com
			User git
			IdentityFile ~/.ssh/work_rsa
			* If you have two SSH keys mapped to GitHub, one may be used by default, and another when explicitly specified.

			3. <b>Multiple GitHub Accounts</b>
			* Hi ads9055! might be your personal GitHub account.
			* Hi ardikas! might be your work/school GitHub account.
			* Each might have its own SSH key registered in GitHub → Settings → SSH and GPG keys.

			4. <b>SSH Agent Caching Multiple Keys</b> - Run:
			ssh-add -l
			* This lists currently loaded SSH keys. If multiple are listed, your system is using more than one identity.
			* If needed, you can remove all loaded keys and re-add a specific one:
			ssh-add -D # Remove all SSH keys from memory
			ssh-add ~/.ssh/github_rsa # Load only a specific key


			6. To confirm which SSH key is being used when connecting to GitHub. The <b>-vT flag</b> provides verbose output, showing which identity file is being used.:
			ssh -vT git@github.com

	====How to commit/upload to git====		====How to commit/upload to git====