apm
Query Advanced Power Management status and battery info.
TLDR
Show APM status (power/battery)
$ apm
Show verbose status$ apm -v
Minutes of battery remaining$ apm -m
Show battery percentage$ apm -l
Suspend the system$ sudo apm -s
SYNOPSIS
apm [-vVmsSlba]
DESCRIPTION
apm queries Advanced Power Management (APM) status on Linux systems. It reports battery charge level, AC adapter status, and power management capabilities.
APM has largely been superseded by ACPI on modern systems, but the command may still work for compatibility or on older hardware.
PARAMETERS
-v, --verbose
Verbose output-V, --version
Print version-m, --minutes
Show minutes of battery remaining-s, --suspend
Suspend the system-S, --standby
Enter standby mode-l, --life
Show battery percentage-b, --brief
Brief output-a, --ac
Show AC power status
CAVEATS
APM is deprecated in favor of ACPI on modern systems. Functionality may be limited or unavailable on ACPI-only systems. Use acpi command on modern hardware.
HISTORY
apm was the standard power management interface for Linux until ACPI (Advanced Configuration and Power Interface) became dominant in the mid-2000s. The command remains for legacy compatibility.