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A stray "J" I encountered years ago: a certain client's support tickets would often end with a single "J", which was a little confusing as it was not one of their name initials. After a brief investigation, the original email source contained this: J Which renders as a smiley face.
echo -e "test\n" | wl-copy
wl-pasteEarlier quoted context omitted.
\n is ^J (ctrl-J) so there's some logic there, but I wonder if something has been lost in the message. I'd guess it either displays ^J or an inverse-colour J, rather than just a plain lowercase j. Also possible that the j is a red herring and just some random character that's always there. Pasting a URL containing a newline into most browsers just truncates it at the newline, regardless of how much text is after. I o…
> \n is ^J (ctrl-J) so there's some logic there The same 'j' as vi uses for 'hjkl'. https://vi.stackexchange.com/questions/42426/why-did-vi-use-...
In the stone age, pressing CTRL flipped that bit, so ^J is literally "ctrl-J".
Earlier quoted context omitted.
> \n is ^J (ctrl-J) so there's some logic there The same 'j' as vi uses for 'hjkl'. https://vi.stackexchange.com/questions/42426/why-did-vi-use-...
also the same 'j' found in words like 'jujuism', 'jejunities', and 'bejeezus', also by a magical coincidence the same one in most Latin fonts, and even some random text strings such as 'pj$4' But I suppose you're saying ASCII 10 was chosen as newly because it aligns with the down arrow on keyboards of the time. Maybe.
The linked StackExchange has it as:
> What character was used for what control code was mostly a matter of bitwise arithmetics. LF is ^J because J happens to be at the corresponding location in the corresponding column of the table (+ 64 in decimal)
Earlier quoted context omitted.
> \n is ^J (ctrl-J) so there's some logic there The same 'j' as vi uses for 'hjkl'. https://vi.stackexchange.com/questions/42426/why-did-vi-use-...
No, it's ^J because `J` is 0x4A in ASCII and `\n` is 0x0A, just as `I` is 0x49 and `\t` (tab, ^I) is 0x09. In the stone age, pressing CTRL flipped that bit, so ^J is literally "ctrl-J".
Earlier quoted context omitted.
> \n is ^J (ctrl-J) so there's some logic there The same 'j' as vi uses for 'hjkl'. https://vi.stackexchange.com/questions/42426/why-did-vi-use-...
also the same 'j' found in words like 'jujuism', 'jejunities', and 'bejeezus', also by a magical coincidence the same one in most Latin fonts, and even some random text strings such as 'pj$4' But I suppose you're saying ASCII 10 was chosen as newly because it aligns with the down arrow on keyboards of the time. Maybe.
> but in ANSI newline delimiter is translated as "j" ?
That's how the J got inserted, then whatever is processing this is swallowing the rest of the escape sequence but leaving the J. The fix is there, take the J with the rest of the escape sequence at whatever layer is doing this.
ESC[J erase in display (same as ESC[0J)
ESC[0J erase from cursor until end of screen
ESC[1J erase from cursor to beginning of screen
ESC[2J erase entire screen
ESC[3J erase saved lines
unix is ingenious how it has accomodated changes and conflicting ideas, incorporating the new squoze next to the old, like UTF-8 because the same people did that. It's not perfect, but it proved "worse is better" because it for a long time it outcompeted its alternatives and never became bloated and overburdened by bureaucratic committee ideas.
however today's developers did not "come up" in the same culture of apprenticeship learning so a lot of the clever subtlety has been lost and now worse is starting to be worse, and guess what, there is no better.