From 3478b1a706d71e69da1d0b3ffc2ac3831b4389dc Mon Sep 17 00:00:00 2001
From: Michele Cereda <cereda.michele@gmail.com>
Date: Thu, 29 Feb 2024 22:13:04 +0100
Subject: [PATCH] chore(kb/fish): note down process substitution

---
 knowledge base/fish.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/knowledge base/fish.md b/knowledge base/fish.md
index e50b252..e01f268 100644
--- a/knowledge base/fish.md	
+++ b/knowledge base/fish.md	
@@ -27,6 +27,12 @@ chsh -s "$(which fish)"   # from `{ba,z}sh`
 # Open the web-based configuration interface.
 fish_config
 fish_config browse
+
+# Process substitution.
+# What in BASH or ZSH would be `<(echo …)`.
+diff -y -W 200 \
+  (aws … --output 'json' | psub) \
+  (aws … --output 'json' | psub)
 ```
 
 ## Configuration