Linux admin tools

Small calculators and generators that run entirely in your browser. Nothing you type is sent anywhere.

Permissions

chmod calculator

Convert between 755, rwxr-xr-x and checkboxes, and copy the chmod command.

umask calculator

Turn a umask into file and directory modes, or find the umask for the mode you want.

Scheduling

Cron to systemd timer

Turn a crontab line into a .service and .timer pair with the right OnCalendar=.

Crontab generator

Build cron expressions, explain them in plain English and preview the next run times.

Networking

Subnet calculator

Network, broadcast, host range, netmask and host count for any IPv4 CIDR block.