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redshift:tldr:dc169
The command "redshift -b ${0-7}:${0-4}" is used to set the color temperature of a computer screen using the Redshift utility.
Here's a breakdown of the command:
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"redshift": This is the name of the command-line utility that is being executed. Redshift is a program that adjusts the color temperature of the screen based on the time of day, helping to reduce eye strain and improve sleep quality.
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"-b": This is an option for the redshift utility which specifies that we want to set the color temperature manually.
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"${0-7}:${0-4}": This is the value provided to the "-b" option. The format is "daytime:nighttime". Here, "${0-7}" represents the desired color temperature during the daytime, and "${0-4}" represents the desired color temperature during nighttime. The numbers 0-7 and 0-4 are placeholders and can be replaced with actual values.
The color temperature is measured in units of Kelvin (K), with lower values representing warmer/natural tones and higher values representing cooler/bluish tones. So, by specifying the desired color temperature for daytime and nighttime, the redshift utility will adjust the screen color temperature accordingly.