at
at is a Linux command in the Date & Time category, rated intermediate difficulty. Schedules a one-time command to run at a specified time. The syntax is at [options] time. Key options and parameters: time — when to run. It returns scheduled job. A close relative is date, which displays or sets the system date and time. A close relative is cal, which displays a calendar in the terminal. A close relative is time, which measures the execution time of a command (real, user, sys). More about this category: Linux date and time commands — date, cal, timedatectl, and more. View and set system date and time. Related Date & Time commands: date, cal, time, sleep, crontab, hwclock, timedatectl, ntpdate. This page is part of the free Linux Reference documentation covering 304+ commands, each with syntax, options, practical examples, and a difficulty rating.