redshift oneshot calls

cf https://github.com/jonls/redshift

The value is always relative to the current tempurature, with “current” = 6500K. Repeating calls like redshift -O 5000 will continue to darken the screen.

at night:

redshift -x
# redshift -O 1900K
# redshift -O 3700K
# redshift -O 5000K
redshift -O 6500K
# redshift -O 8500K

reset:

redshift -x

Supposedly using warmer temperatures will prevent eye strain. When setting it really low, I’ve found it only takes a few minutes to get used to a new color tempurature.