How to Input Password to Git Pull Command

How to enter command with password for git pull?

This is not exactly what you asked for, but for http(s):

you can put the password in .netrc file (_netrc on windows). From there it would be picked up automatically. It would go to your home folder with 600 permissions.
you could also just clone the repo with https://user:pass@domain/repo but that's not really recommended as it would show your user/pass in a lot of places...
a new option is to use the credential helper. Note that credentials would be stored in clear text in your local config using standard credential helper. credential-helper with wincred can be also used on windows.

Usage examples for credential helper

git config credential.helper store - stores the credentials indefinitely.
git config credential.helper 'cache --timeout=3600'- stores for 60 minutes

For ssh-based access, you'd use ssh agent that will provide the ssh key when needed. This would require generating keys on your computer, storing the public key on the remote server and adding the private key to relevant keystore.

How to input password to git pull command?

I would really recommend to not try and manage that password step, and delegate that (both on Linux and Windows) to git credential helper.

See:

"Git http - securely remember credentials"
"How to use git with gnome-keyring integration"

The user will enter the password only once per session.

execute git pull with username and password

It is okay to use

git pull http://ahmeditmna:123456@xxxxx.git

I think you mean git clone http://ahmeditmna:123456@xxxxx.git

Technically speaking, yes. http://username:password@domain/path is a valid URL part of HTTP(S) protocol.

But is that safe or should you do it? No.

Well first, it's better to use HTTPS, if you are pushing / pulling from a public repository it won't be a problem since data is already public, but if it's a private repository your data could be read by an attacker.

But the more important part is anyone having access to the copy of your repository would be able to read your credentials. Just try it (I took the first Python related repository for this example..):

cd /tmp/
git clone 'https://username:password@bitbucket.org/mshibly/python-examples-from-intro-to-python-course.git'
cd python-examples-from-intro-to-python-course/
git remote -v

git remote -v list repository's remotes URL, let's see:

origin   https://username:password@bitbucket.org/mshibly/python-examples-from-intro-to-python-course.git (fetch)
origin   https://username:password@bitbucket.org/mshibly/python-examples-from-intro-to-python-course.git (push)

As you can see, your credentials are here, waiting to be read.

And that's even worst if you use this on a server since depending on your general configuration you can find your credentials in logs. Not speaking about the fact you may end by scripting this and have your credentials into a script you may commit and / or store on someone's else server.

The point here is there are not good reasons to do this, but there a plenty of good reasons to not.

No, it's not ok to do this.
I advise you to spend some hours learning how SSH works and configuring your OS.

How can I save username and password in Git?

Attention: This method saves the credentials in plaintext on your PC's disk. Everyone on your computer can access it, e.g. malicious NPM modules.

Run

git config --global credential.helper store

then

git pull

provide a username and password and those details will then be remembered later. The credentials are stored in a file on the disk, with the disk permissions of "just user readable/writable" but still in plaintext.

If you want to change the password later

git pull

Will fail, because the password is incorrect, git then removes the offending user+password from the ~/.git-credentials file, so now re-run

git pull

to provide a new password so it works as earlier.

How do I provide a username and password when running git clone git@remote.git ?

Based on Michael Scharf's comment:

You can leave out the password so that it won't be logged in your Bash history file:

git clone https://username@github.com/username/repository.git

It will prompt you for your password.

Alternatively, you may use:

git clone https://username:password@github.com/username/repository.git

This way worked for me from a GitHub repository.

How can I force user and password prompt when pushing to my git repository?

With git config -l, I now see I have a credential.helper=osxkeychain option

That means the credential helper (initially introduced in 1.7.10) is now in effect, and will cache automatically the password for accessing a remote repository over HTTP.

(as in "GIT: Any way to set default login credentials?")

You can disable that option entirely, or only for a single repo.

how to implement the git pull in shell script without prompting username and password

You have two options:

Clone your project using SSH.
- I don't think you want this because you asked for a username and password. So I'll ignore it.
Clone your project with HTTPS setting the username and password in the URL itself.
- EX: https://username:password@gitlab.com/my-project
- If you already cloned the project, you still can edit the URL by: git remote set-url origin https://username:password@gitlab.com/my-project and you cab check your change by git remote -v

Note: I would recommend using a specific token for this to limit the security impact. Read more here: https://docs.gitlab.com/ee/security/token_overview.html