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3

First, it is unlikely that some alternative method (other than responses to control sequences) could be the basis of "a general solution" as requested by the OP, since the property sought is not (for example) amenable to methods using the window properties. Next, this is an example of control sequences which are implemented in xterm but not generally ...


3

There are a couple of fundamental problems with this question: For this to result in a general solution, the command would have to be supported by ANSI X3.64, the base standard for all modern terminals, but as far as I can tell, that is not an ANSI command. I'm uncertain because I don't have a copy of that standard, I can't find one online, and ANSI won't ...


2

Use tput to get the control sequences (if they exist) for the user's terminal: red="`tput setaf 1`" green="`tput setaf 2`" cyan="`tput setaf 6`" bold="`tput bold`" norm="`tput sgr0`" echo "${red}invalid entries${norm}" echo "valid entries" echo "valid entry"


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According to XTerm Control Sequences, those are responses for a particular flavor of mouse, "SGR (1006)". Your terminal was perhaps initialized to send those, e.g., in continuous mode, and on resizing you are seeing the effect of your mouse movement relative to the screen.


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It's called blink mode. If your terminal supports it, syntax is echo -e "Normal \e[5mBlink" Bash tips: Colors and formatting ANSI/VT100 Control sequences


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echo -e "\e[31minvalid entries\e[0m" Reference: Bash tips: Colors and formatting (ANSI/VT100 Control sequences)


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Have you got specific operations in mind? Here is an example of using standout mode, which on many terminals will give a strong visible result: tput smso; echo hello, world; tput rmso If you were to pipe the sequence to, say, cat, the highlighting would become an empty operation because a pipe isn't a device that understands standout mode: ( tput smso; ...


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Actually it is possible to inquire DEC terminals (and their clones and emulations, including xterm) about their capabilities; just not about individual escape sequence support (or its completeness). UNIX generally doesn't use this feature, relying on termcap/terminfo databases (which document the quirks as well). For reference, the sequences are DA ...



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