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comment Why does \033 escape work for vars like PS1 and \x1b doesn't?
True, the bash manpage covers it. So the set of escape sequences recognised by Bash prompt is completely independent from what echo uses.
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accepted Why does \033 escape work for vars like PS1 and \x1b doesn't?
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asked Why does \033 escape work for vars like PS1 and \x1b doesn't?
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comment Print leading zeros with C++ output operator (printf equivalent)?
The OP explicitly asked for a way that uses the << operator instead of (s)printf.
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