I saw this and definitely wanted to share it.

diff two variables

VAR1="hello"
VAR2="helllo"
diff -u <(echo "$VAR1") <(echo "$VAR2")

# output:
--- /dev/fd/11	2026-01-17 20:03:59
+++ /dev/fd/12	2026-01-17 20:03:59
@@ -1 +1 @@
-hello
+helllo
paste <(seq 1 5) <(seq 6 10)

# output:
1	6
2	7
3	8
4	9
5	10

read in temp file

less < <(curl -s https://raw.githubusercontent.com/asdf8601/asdfff.dev/main/README.md)

redirect output to a process

echo "hello world" > >(tr a-z A-Z)

# output:
HELLO WORLD