Category
Linux
Permissions, cron, systemd, shell quoting, and command builders for common Linux tools.
chmod Calculator
Convert a numeric chmod mode to its ls -l permission string and back, including setuid, setgid, and the sticky bit.
chmod Symbolic Mode
Apply a POSIX symbolic chmod expression like u+rwx,go-w to a starting mode and see the mode change clause by clause.
Cron Expression Generator
Build a crontab line from a preset schedule or a custom expression, then confirm what it means by parsing it and listing its next run times.
Cron Expression Parser
Explain a crontab line field by field and list its next run times, including the day-of-month / day-of-week trap.
Env Formatter
Convert environment-variable listings between .env, shell export, Docker --env, systemd Environment=, JSON, and a flat YAML-ish mapping.
find Command Builder
Build a safely quoted GNU find command from common path, name, type, age, size, and action filters.
fstab Line Generator
Generate one escaped /etc/fstab entry from six explicit fields, for review before use.
grep Command Builder
Build a safely quoted GNU grep command with fixed or extended-regex matching and common filters.
journalctl Command Builder
Build a safely quoted journalctl command for common systemd journal filters and output modes.
Mount Option Helper
Normalize a small curated subset of mount options and clearly retain options this tool does not interpret.
rsync Command Builder
Build a reviewable rsync transfer command locally, with archive, SSH, exclude, and dry-run options.
Shell Quote
Quote a string so a POSIX shell passes it through as one literal argument, or unquote a shell word back to its value.
SSH Config Helper
Generate or parse a limited SSH Host config block locally.
systemd OnCalendar Parser
Normalize a systemd OnCalendar= expression and list when the timer would next elapse, without running systemd-analyze.
systemd Service Unit Generator
Build a bounded, reviewable .service unit from explicit fields without executing a command.
systemd Timer Generator
Generate a bounded .timer unit and normalize its supported OnCalendar= expression locally.
tar Command Builder
Build a bounded tar create, extract, or list command locally.
umask Calculator
Convert an octal or symbolic umask into the default permissions for newly created files and directories.
Unix Path Helper
Inspect, normalize, join, and compute relative POSIX paths, the way os.path or pathlib does.
Unix Signals Reference
Searchable reference of standard Linux signals with default actions, catchability, and exit status codes.