Use bash instead of sh

We are relying on some bash-specific substitutions
that I can't get rid off quickly and safely.

README.md

@@ -27,10 +27,10 @@ Relevant results are displayed first based on current directory, git repo, and e
 Install RESH with one command:
 
 ```sh
-curl -fsSL https://raw.githubusercontent.com/curusarn/resh/master/scripts/rawinstall.sh | sh
+curl -fsSL https://raw.githubusercontent.com/curusarn/resh/master/scripts/rawinstall.sh | bash
 ```
 
-ℹ️ You will need to have `curl` and `tar` installed.
+ℹ️ You will need to have `bash`, `curl`, and `tar` installed.
 
 More options on [Installation page ⇗](./installation.md)
 

installation.md

@@ -5,10 +5,10 @@
 Feel free to check the `rawinstall.sh` script before running it.
 
 ```sh
-curl -fsSL https://raw.githubusercontent.com/curusarn/resh/master/scripts/rawinstall.sh | sh
+curl -fsSL https://raw.githubusercontent.com/curusarn/resh/master/scripts/rawinstall.sh | bash
 ```
 
-ℹ️ You will need to have `curl` and `tar` installed.
+ℹ️ You will need to have `bash`, `curl`, and `tar` installed.
 
 ## Clone & install
 

scripts/rawinstall.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -eu
+set -euo pipefail
 
 echo
 echo "Please report any issues you encounter to: https://github.com/curusarn/resh/issues"