Ausgabe von time, was bedeuten die Zeitangaben genau?

[Zeitangabe]

$ time echo

real	0m0.002s
user	0m0.000s
sys	0m0.000s
$

Wofür steht real, user und sys genau?

[CStoll]

man: time - echte Laufzeit bzw. tatsächlich genutzte CPU-Zeit

[Zeitangabe]

CStoll schrieb:

man: time - echte Laufzeit bzw. tatsächlich genutzte CPU-Zeit

Danke, die sollten mal die GNU manpage bezüglich time überarbeiten:

DESCRIPTION
time run the program COMMAND with any given arguments ARG.... When
COMMAND finishes, time displays information about resources used by
COMMAND (on the standard error output, by default). If COMMAND exits
with non-zero status, time displays a warning message and the exit sta‐
tus.

time determines which information to display about the resources used
by the COMMAND from the string FORMAT. If no format is specified on
the command line, but the TIME environment variable is set, its value
is used as the format. Otherwise, a default format built into time is
used.

Options to time must appear on the command line before COMMAND. Any‐
thing on the command line after COMMAND is passed as arguments to COM‐
MAND.