Useful Commands

A grab bag of small commands that are useful in day‑to‑day dev work.

Bash

• Find files by name (case‑insensitive):

find . -iname "*foo*"

• Replace text recursively (ripgrep + sd):

rg -l "from" | xargs sd "from" "to"

• Show disk usage of current directory, human readable:

du -sh ./* | sort -h

SQL

• Count rows in a table:

SELECT COUNT(*) FROM my_table;

• Delete older than 30 days:

DELETE FROM logs WHERE created_at < NOW() - INTERVAL 30 DAY;

Adapt the snippets to your environment and always double‑check destructive commands before running them.