Related: https://github.com/ohmyzsh/ohmyzsh/pull/10713/files#r820219899

When the `git init` call fails, the directory is not created,
so the rm command fails with a not found error. This change
checks whether the directory exists before deleting it.

Fixes #10680

Fixes missing $USER value in ArchLinux sh (bash)

The previous check only worked if the user could run `sudo` without typing the
password, which is almost none (I checked in Google Cloud Shell so I failed to
notice this).

This new check works whether the user has no sudo privileges, or if it has,
whether they have to type in the password or not.

It should really be easier to check if the user doesn't have privilege without
having to make them type the password.

This fixes the error in Google Cloud Shell, where a password prompt
appears when running `chsh` but the user (hello) does not have a
password.

If ran with `sudo`, the `chsh` command happens without a password
prompt.

Fixes #10422

Co-authored-by: Marc Cornellà <hello@mcornella.com>

Closes #8788
Co-authored-by: Nikolas Garofil <nikolas@garofil.be>

Fixes #9701

* refactor(install.sh): fix static analysis warnings

Clear all warnings and errors raised by shellcheck.net static analysis.

- Replace non-POSIX shell use of `$OSTYPE` by POSIX compliant check on `uname -o`.
- Move variables out of`printf` format string.
- Refactor/simplify string formatters for error and underline.
- Fix expansion of arguments to a single string `$*` rather than individual elements `$@` within the error and underline formatters.

* fix(uname): non-posix -o option

* fix(install.sh): non portable which

Replaced non-portable `which zsh` by portable `command -v zsh`

Also prefix all formatting functions with fmt_

Related: #9427

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Changing 'your' to 'you'

* Add option to install OMZ without replacing .zshrc

tools/install.sh respects REPLACE_RC environment variable
--noreplace-rc flag sets REPLACE_RC='no'

* Change REPLACE_RC=no to KEEP_ZSHRC=yes

Change --noreplace-rc to --keep-zshrc

* Change project URL from robbyrussell to ohmyzsh org

* Update git remote to use ohmyzsh org repository

- core.autocrlf=false -> #4069
- fsck.zeroPaddedFilemode -> #4963

Fixes #4069
Fixes #4963

tput is error-prone and may not be needed, since all the formatting
codes used are standard across all types of terminals.

tput may throw errors on invalid $TERM values, for example.
This shorthand syntax allows for that as well as for if tput
doesn't exist.

Co-authored-by: Antonio QUINTAVALLE <antonio.quintavalle@amadeus.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>