N.2. Configuring the Colors
The actual colors to be used are configured using the environment variable PG_COLORS (note plural). The value is a colon-separated list of key=value
The following keys are currently in use:
errorused to highlight the text “error” in error messages
warningused to highlight the text “warning” in warning messages
locusused to highlight location information (e.g., program name and file name) in messages
The default value is error=01;31:warning=01;35:locus=01 (01;31 = bold red, 01;35 = bold magenta, 01 = bold default color).
Tip
This color specification format is also used by other software packages such as GCC, GNU coreutils, and GNU grep.