Everyday reference and conversion tools for the command line, config files and code. The utilities you keep open in a tab while you work.
Searchable reference of common Linux commands grouped by task, with examples and copyable syntax.
Common Windows and PowerShell commands for admin and diagnostics, grouped and copyable.
Handy security and hardening commands across Linux and Windows, in one searchable list.
Common Git commands grouped by workflow, from staging and commits to branching and undoing mistakes.
Everyday Docker commands for images, containers, volumes and networks, with copyable syntax.
Test a regular expression against sample text and see your matches and capture groups live.
Check a regular expression for catastrophic backtracking and other patterns that cause ReDoS.
Format, validate and inspect JSON with clear line and column errors when something is off.
Convert between YAML and JSON in both directions, with validation on the way through.
Build and read cron expressions in plain English and preview the next few run times.
Toggle read, write and execute for owner, group and others and get the octal and symbolic mode.
Look up any HTTP status code by number or meaning, grouped by class with a plain explanation.
SQL statements grouped by task with copyable example syntax, from selects and joins to DDL.
Command references reviewed June 2026.
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