Stephen Hemminger 6044fa3d0f allow overriding color option in environment
For ip, tc, and bridge command introduce a new way to enable
automatic colorization via environment variable.

Example:
  $ IP_COLOR=auto ip -br show addr

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
2023-09-15 09:41:17 -07:00
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