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In the 1970s, Grace Hopper, also known as "Grandma COBOL", pushed for the Defense Department to replace large, centralized systems with networks of small, distributed computers.
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redshift(1) [debian man page]

REDSHIFT(1)							   User Commands						       REDSHIFT(1)

redshift - Set color temperature of display according to time of day. SYNOPSIS
redshift adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night. The color temperature is set according to the position of the sun. A different color temperature is set during night and daytime. During twilight and early morning, the color temperature transitions smoothly from night to daytime temperature to allow your eyes to slowly adapt. OPTIONS
-h Display this help message -v Verbose output -V Show program version -b N Screen brightness to apply (max is 1.0) -c FILE Load settings from specified configuration file -g R:G:B Additional gamma correction to apply -l LAT:LON Your current location -l PROVIDER Select provider for automatic location updates (Type `list' to see available providers) -m METHOD Method to use to set color temperature (Type `list' to see available methods) -o One shot mode (do not continuously adjust color temperature) -O TEMP One shot manual mode (set color temperature) -x Reset mode (remove adjustment from screen) -r Disable temperature transitions -t DAY:NIGHT Color temperature to set at daytime/night The neutral temperature is 6500K. Using this value will not change the color temperature of the display. Setting the color temperature to a value higher than this results in more blue light, and setting a lower value will result in more red light. Default values: Daytime temperature: 5500K Night temperature: 3700K Please report bugs to <> SEE ALSO
The full documentation for redshift is maintained as a Texinfo manual. If the info and redshift programs are properly installed at your site, the command info redshift should give you access to the complete manual. AUTHOR
redshift was written by Martin Koelewijn and Jon Lund Steffensen. This manual page was created by Franziska Lichtblau <> for the Debian project (and may be used by others). redshift 1.7 June 2012 REDSHIFT(1)

Check Out this Related Man Page

LM75(4) 						   BSD Kernel Interfaces Manual 						   LM75(4)

lm75 -- lm75 i2c digital temperature sensor driver SYNOPSIS
device iic device iicbus device lm75 DESCRIPTION
The lm75 driver provides access to sensor data and configuration over the iicbus(4). It provides an easy and simple way to check the functionality of an i2c bus as it provides read and write access to the lm75 configuration register. The access to lm75 data is made via the sysctl(8) interface: dev.lm75.0.%desc: LM75 temperature sensor dev.lm75.0.%driver: lm75 dev.lm75.0.%location: addr=0x49 dev.lm75.0.%pnpinfo: name=lm750 compat=national,lm75 dev.lm75.0.%parent: iicbus3 dev.lm75.0.temperature: 27.1C dev.lm75.0.thyst: 75.0C dev.lm75.0.tos: 80.0C dev.lm75.0.faults: 1 dev.lm75.0.mode: comparator dev.lm75.0.polarity: active-low dev.lm75.0.shutdown: 0 dev.lm75.%d.temperature Is the read-only value of the current temperature read by the sensor. dev.lm75.%d.thyst Sets the hysteresis temperature. Once the temperature gets over the overtemperature shutdown value (tos) it needs to drop below the hysteresis temperature to disable the output (interrupt) pin again. dev.lm75.%d.tos Sets the overtemperature shutdown value. Once the temperature gets over this value the output pin will be enabled. The way the output (interrupt) pin works, depends on the mode configuration. dev.lm75.%d.faults Is the number of faults that must occur consecutively to activate the interrupt (output) pin. It can be set to 1, 2, 4, and 6. dev.lm75.%d.mode Sets the operation mode for the sensor interrupt pin. It can be set to 'comparator' (default) or 'interrupt'. dev.lm75.%d.polarity Sets the polarity of the sensor interrupt pin. It can be set to 'active-low' (default) or 'active-high'. Please note that the output pin is an open-drain output and it needs a proper pull-up resistor to work. dev.lm75.%d.shutdown When set to '1' it shuts down the sensor. The temperature conversion stops but the sensor remains with its i2c bus active, i.e., it can be woken up by setting this option to '0' again. Please check the lm75 datasheet for more details. When used together with snmp_lm75(3) it allows the monitoring of lm75 temperature data over SNMP. The lm75 driver supports both the low and the high resolution models. The low resolution model (lm75) provides a 9 bit output with the LSB representing 0.5C. The high resolution model (lm75a) provides an 11 bit output with the LSB representing 0.125C. The driver tries to auto-detect the lm75 model, but the detection of some lm75 clones may not work reliably. On a device.hints(5) based system, like MIPS, these values are configurable for lm75: Is the iicbus(4) you are attaching to. hint.lm75.%d.addr Is the lm75 i2c address on the iicbus(4). On a FDT(4) based system, like ARM, the DTS part for a lm75 device usually looks like: i2c { ... lm750 { compatible = "national,lm75"; i2c-address = <0x49>; }; }; Where: compatible Should always be set to "national,lm75". i2c-address The i2c-address property indicates which i2c address the lm75 is wired at. lm75 temperature sensors can be wired to 8 different addresses, allowing up to 8 sensors on the same iicbus(4). SEE ALSO
snmp_lm75(3), fdt(4), iic(4), iicbus(4), sysctl(8) HISTORY
The lm75 driver first appeared in FreeBSD 11.0. AUTHORS
The lm75 driver and this manual page were written by Luiz Otavio O Souza <>. BSD
May 11, 2014 BSD

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