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rtcwake:tldr:e69a1
The command "sudo rtcwake -m on --date ${hh:ss}" is used to put the system into a sleep mode until a specific time. Here's an explanation of each part of the command:
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"sudo": This command is used to execute the rest of the command as a superuser or administrator. It provides administrative privileges to the subsequent command.
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"rtcwake": This is the main command responsible for managing the system's real-time clock (RTC) wake-up functions. The RTC is a hardware component that keeps track of time even when the computer is powered off.
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"-m on": This parameter specifies the sleep mode to enter. In this case, "on" indicates that the system should be put into the sleep mode.
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"--date ${hh:ss}": This parameter allows you to specify when the system should wake up from sleep. The "${hh:ss}" is a placeholder that should be replaced with the desired time in hours and minutes. For example, if you wanted the system to wake up at 8:30, it will be "--date 08:30".
By executing this command with the appropriate time, the system will enter sleep mode and automatically wake up at the specified time.