Unix

Unix time, permissions, and shell reference · 4 tools

Permissions 2

Chmod Calculator Build chmod octal values from owner, group, and other permissions — with rwx breakdowns for 755, 644, 700 and more.

File Permissions Reference Unix permission digits 0–7 decoded, plus the chmod modes you actually use and what they are for.

Reference 1

Unix Signals Reference Unix/Linux signals — numbers, names, default actions, and when each is the right way to stop a process.

Scheduling 1

Cron Expression Parser Decode any cron expression: per-field explanation and the next five runs in your timezone, with names, ranges, and steps supported.