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Top Forums UNIX for Advanced & Expert Users Why is editing a file by renaming the new one safer? Post 303042579 by MadeInGermany on Monday 30th of December 2019 11:04:48 AM
Old 12-30-2019
They mean: copying a file, especially a big file, is done in steps. If there is a power loss in between, the status of the file is unknown: can be empty or partially copied.
In contrast, renaming/moving a file is "atomic": after a power loss it's either 100% the new file or 100% the old file.

But with a copy speed of >100 Mbyte per second and "journaling" it is a bit paranoid to assume a power loss within these microseconds, IMHO.
So that's why I prefer to keep the inode intact (including attributes and link count), and simply assume that power will last for the next microseconds.
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PMSET(1)						    BSD General Commands Manual 						  PMSET(1)

NAME
pmset -- modify power management settings SYNOPSIS
pmset [-a | -b | -c] [dim minutes] [spindown minutes] [sleep minutes] [womp 1/0] [ring 1/0] [autorestart 1/0] [dps 1/0] [reduce 1/0] [powerbutton 1/0] [lidwake 1/0] [acwake 1/0] [boot] pmset -g [disk | live | cap | sched] DESCRIPTION
pmset changes and reads power management settings such as idle sleep timing, wake on administrative access, automatic restart on power loss, etc. SETTING
The -a, -b, -c flags determine whether the settings apply to battery (-b), charger (wall power) (-c), or all (-a). Use a minutes argument of 0 to set the idle time to never. pmset must be run as root. The boot argument tells power management that system bootup is complete. Loginwindow handles this on a normal Mac OS X system. GETTING
The -g flag outputs the settings currently in use (same as -g live ). -g disk will tell you the settings on disk. -g cap will tell you which power management features the machine supports. -g sched will show scheduled startup/wake and shutdown/sleep events. ARGUMENTS
dim - display dim timer (value in minutes) spindown - disk spindown timer (value in minutes) sleep - system sleep timer (value in minutes) womp - wake on ethernet magic packet (value = 0/1) ring - wake on modem ring (value = 0/1) autorestart - automatic restart on power loss (value = 0/1) dps - dynamically change processor speed based on load (value = 0/1) reduce - reduce processor speed (value = 0/1) powerbutton - sleep the machine when power button is pressed (value = 0/1) lidwake - wake the machine when the laptop lid(or clamshell) is opened (value = 0/1) acwake - wake the machine when power source (AC/battery) is changed (value = 0/1) OTHER ARGUMENTS
These arguments don't directly affect power management settings: boot - tell the kernel that system boot is complete EXAMPLES
pmset -b dim 5 pmset -a dim 10 spindown 10 sleep 30 womp 1 pmset -g live FILES
All changes made through pmset are saved in a persistent preferences file (per-system, not per-user) at /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist pmset modifies the same file that System Preferences Energy Saver modifies. Darwin August 19, 2002 Darwin
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