NIX installtation

[Sakshikhade]

Platform

• macOS

Additional information

sh <(curl -L https://nixos.org/nix/install)

Output

I back up shell profile/rc scripts before I add Nix to them.
I need to back up /etc/bash.bashrc to /etc/bash.bashrc.backup-before-nix,
but the latter already exists.

Here's how to clean up the old backup file:

1. Back up (copy) /etc/bash.bashrc and /etc/bash.bashrc.backup-before-nix
   to another location, just in case.

2. Ensure /etc/bash.bashrc.backup-before-nix does not have anything
   Nix-related in it. If it does, something is probably quite
   wrong. Please open an issue or get in touch immediately.

3. Once you confirm /etc/bash.bashrc is backed up and
   /etc/bash.bashrc.backup-before-nix doesn't mention Nix, run:
   mv /etc/bash.bashrc.backup-before-nix /etc/bash.bashrc

</details>

## Priorities

Add :+1: to [issues you find important](https://github.com/NixOS/nix/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc).

[abathur]

It looks like you've just quoted output from the installer. What's the problem?

[roberth]

It seems that having to back up two files is confusing to people when those two files already have a "backup of" relation between themselves. I think we've had similar reports before.

What if the installer just did it for them? Or made a very concrete suggestion, such as:

time=$(date -Iminutes)
mkdir /etc/bashrc-backups-before-nix-installation-$time
cp /etc/bash.bashrc /etc/bash.bashrc.backup-before-nix /etc/bashrc-backups-before-nix-installation-$time
unset time