Linux
Linux tools for file permissions, RAID and filesystem capacity, cron, netplan, systemd units, package-manager commands, and other admin helpers that run in your browser.
Btrfs RAID Calculator
Estimate usable Btrfs space for RAID1, RAID1c3, RAID10, and other profiles, including mixed disk sizes, then copy a mkfs.btrfs command.
Chmod Calculator
Convert Linux file permissions between octal and symbolic notation, then copy a ready-to-run chmod command.
Cron Expression Builder
Build a Linux crontab from dropdowns or a pasted expression, then copy the line, a plain-English schedule, next run times, and OnCalendar=.
Netplan Generator
Build Ubuntu Netplan YAML for ethernet or Wi-Fi — DHCP or static IP, DNS, and routes — then copy or download a file you can drop in /etc/netplan/.
Package Manager Cheat Sheet
Pick a Linux or BSD distro from the dropdown and copy the matching command — refresh, install, remove, or the update-and-reboot one-liner.
RAID Calculator
Work out usable capacity for mdadm RAID 0, 1, 5, 6, and 10 from your disk count and sizes, then copy a ready-to-run mdadm command.
Systemd Service Generator
Build a systemd .service and optional .timer from Type, User, Restart, and OnCalendar, then copy files for /etc/systemd/system/ or a user unit dir.
ZFS Capacity Calculator
Estimate usable ZFS pool space for mirrors, RAIDZ1, RAIDZ2, and RAIDZ3, including slop space, then copy a zpool create command.