If you've just started using Git or Mercurial, you may need to refer to this page a few times before you get the hang of using them from the command line.

TaskGit commandsMercurial (Hg) commands
Create a new local directory:git inithg init
Connect your local repository to a remote server:git remote add origin <server_URL>hg push <server_URL>
Copy a remote repository to your local system:
git clone <URL_to_repository>
hg clone <URL_to_repository>
Add a specific file to staging (Git) or after a new file is created (Hg):
git add <filename>
hg add <filename>
Add all changes to staging (Git) or all new files (Hg):
git add --all
hg add
Commit changes locally:
git commit -m '<message>'
hg commit -m "<message>"
Push changes to your remote repository:

git push <remote_name> <branch_name>

usually: git push origin master

hg push
List the status of the files you've changed and those you still need to add or commit:
git status
hg status
Create a new branch (Git) or bookmark (Hg) and switch to it:
git checkout -b <branch_name>
hg bookmark <bookmark_name>
Switch from one branch or bookmark to another:
git checkout <branch_name>
hg bookmark <bookmark_name>
List all the branches/bookmarks in your repo with an indication of the one you are on:
git branch
hg bookmarks
Delete the feature branch/bookmark:
git branch -d <branch_name>
hg bookmark -d <bookmark_name>
Push the branch/bookmark to your remote repository:
git push origin <branch_name>
hg push -B <bookmark_name>
Fetch and merge changes on the remote server to your working directory:
git pull
hg pull -u
Merge two different revisions into one:
git merge
hg merge
Show all changes made since the last commit:git diffhg diff

For more commands, check out Bitbucket Server's Basic Git commands or the Mercurial Wiki for a more detailed comparison of Git to Mercurial.