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isatty(stdin)before doing so. Mind to share what is that program?cat- quick test I rangrep --color=auto myusername /etc/passwdgives me my username in red with white text elsewhree.grep --color=auto myusername /etc/passwd | catgives me plain white textgrep --color=autoavoids producing colored output when standard output is not a terminal. I'm talking about a command that unconditionally outputs color codes. (As alex points out above, such behavior is arguably a bug, but sometimes we need to work with imperfect software that we can't easily fix ourselves, and that's what this question is about.)grep --colour=always myusername /etc/passwd | catkeeps the username in red.