Make install command in documentation compatible with fish shell (#7474)

Use a pipe for all install commands

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>

4 files changed, 8 insertions, 8 deletions

diff --git a/doc/manual/src/contributing/hacking.md b/doc/manual/src/contributing/hacking.md
index e2046acc8..53f49602b 100644
--- a/doc/manual/src/contributing/hacking.md
+++ b/doc/manual/src/contributing/hacking.md
@@ -219,7 +219,7 @@ After the CI run completes, you can check the output to extract the installer UR
 5. To generate an install command, plug this `install_url` and your GitHub username into this template:
 
     ```console
-    sh <(curl -L <install_url>) --tarball-url-prefix https://<github-username>-nix-install-tests.cachix.org/serve
+    curl -L <install_url> | sh -s -- --tarball-url-prefix https://<github-username>-nix-install-tests.cachix.org/serve
     ```
 
 <!-- #### Manually generating test installers
diff --git a/doc/manual/src/installation/env-variables.md b/doc/manual/src/installation/env-variables.md
index bb35c0e9f..fb8155a80 100644
--- a/doc/manual/src/installation/env-variables.md
+++ b/doc/manual/src/installation/env-variables.md
@@ -27,7 +27,7 @@ Set the environment variable and install Nix
 
 ```console
 $ export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
-$ sh <(curl -L https://nixos.org/nix/install)
+$ curl -L https://nixos.org/nix/install | sh
 ```
 
 In the shell profile and rc files (for example, `/etc/bashrc`,
@@ -38,7 +38,7 @@ export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
 ```
 
 > **Note**
-> 
+>
 > You must not add the export and then do the install, as the Nix
 > installer will detect the presence of Nix configuration, and abort.
 
diff --git a/doc/manual/src/installation/installing-binary.md b/doc/manual/src/installation/installing-binary.md
index 53fdbe31a..e3fd962bd 100644
--- a/doc/manual/src/installation/installing-binary.md
+++ b/doc/manual/src/installation/installing-binary.md
@@ -3,7 +3,7 @@
 The easiest way to install Nix is to run the following command:
 
 ```console
-$ sh <(curl -L https://nixos.org/nix/install)
+$ curl -L https://nixos.org/nix/install | sh
 ```
 
 This will run the installer interactively (causing it to explain what
@@ -27,7 +27,7 @@ you can authenticate with `sudo`.
 To explicitly select a single-user installation on your system:
 
 ```console
-$ sh <(curl -L https://nixos.org/nix/install) --no-daemon
+$ curl -L https://nixos.org/nix/install | sh -s -- --no-daemon
 ```
 
 This will perform a single-user installation of Nix, meaning that `/nix`
@@ -66,7 +66,7 @@ You can instruct the installer to perform a multi-user installation on
 your system:
 
 ```console
-$ sh <(curl -L https://nixos.org/nix/install) --daemon
+$ curl -L https://nixos.org/nix/install | sh -s -- --daemon
 ```
 
 The multi-user installation of Nix will create build users between the
@@ -287,7 +287,7 @@ These install scripts can be used the same as the main NixOS.org
 installation script:
 
 ```console
-$ sh <(curl -L https://nixos.org/nix/install)
+$ curl -L https://nixos.org/nix/install | sh
 ```
 
 In the same directory of the install script are sha256 sums, and gpg
diff --git a/doc/manual/src/quick-start.md b/doc/manual/src/quick-start.md
index e11549984..651134c25 100644
--- a/doc/manual/src/quick-start.md
+++ b/doc/manual/src/quick-start.md
@@ -7,7 +7,7 @@ to subsequent chapters.
 1. Install Nix by running the following:
 
    ```console
-   $ bash <(curl -L https://nixos.org/nix/install) --daemon
+   $ curl -L https://nixos.org/nix/install | sh
    ```
 
    The install script will use `sudo`, so make sure you have sufficient rights.