Linux Tools

Interactive, client-side tools for Linux and DevOps work: permission calculators, subnet planners, cron expression builders, and more. Calculations run locally in your browser.

rsync Command BuilderInteractive rsync command builder. Pick the flags you need, add excludes, an SSH port, or a bandwidth limit, and copy the exact rsync command with an explanation of every option. Cron Generator and Crontab Expression ExplainerBuild cron expressions with presets and field controls, or paste a crontab schedule to see its plain-English meaning and next five run times. Subnet CalculatorInteractive IPv4 subnet and CIDR calculator. Enter a network in CIDR notation to get the network and broadcast address, usable host range, netmask, wildcard mask, and a binary bit view, then split the block into smaller subnets. chmod CalculatorInteractive chmod permission calculator. Toggle read, write, and execute bits to get the octal and symbolic notation, plus the exact chmod command to run.