`<(...)` makes a command's output look like a file; `>(...)` makes a command's input look like a file. Killer feature for tools that only accept filenames.
Bash
# Diff the output of two commands without temp files
diff <(ls /etc/nginx) <(ls /etc/nginx.backup)
# Sort + uniq on two file lists, find files in A but not B
comm -23 <(sort fileA.txt) <(sort fileB.txt)
# Feed a command's output into a tool that wants a file
join -1 1 -2 1 <(sort orders.csv) <(sort customers.csv)
# Capture stderr to a logger AND keep stdout flowing
some_cmd 2> >(logger -t myapp)
# Tee output to multiple consumers via process subs
echo "build complete" | tee >(notify-send "Build") >(logger -t deploy)Save your own code snippets
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