Here's a use-case to clarify my question. Say I have a calendar program that is set to run in ~/.bashrc, and it ensures the streaming output overwrites the same block of lines.Is it possible to have the streaming output display in the terminal from the background process without clobbering new input? I already looked at Displaying stdout of a background process in specific location of the terminal, but the asker requires outputting new lines at termination, which I don't need to do.Here's a screenshot of the program output, which currently runs in the foreground and terminates after outputting the formatted text once:I just want that formatted text to continually replace itself while allowing foreground processes to function as normal. A solution in Bash, C, and / or C++ using something like zsh or ANSI escape sequences would be perfect for me.For reference, here's the current C code I'm using, but if it's easier for you, you could just formulate a solution that uses cal instead:#include <stdio.h>#include <string.h>#include <stdlib.h>#include <time.h>const char months[12][10] = {January, February, March, April, May, June, July, August, September, October, November, December};const char weekDays[7][10] = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday};void printCalendar(void);int getWeekDay(int, int, int, int, int);int getMaxDay(int, int);void getDate(int *, int *, int *, int *, int *, int *, int *);void formatTime(char *, int, int, int);int main(void) {  printCalendar();  return 0;}void printCalendar(void) {  int second, minute, hour, day, month, year, weekDay, maxDay, col, x = 0, i;  char str[12];  getDate(&second, &minute, &hour, &day, &month, &year, &weekDay);  formatTime(str, hour, minute, second);  maxDay = getMaxDay(month, year);  printf(\e[3J);  printf(%s %s\n, weekDays[weekDay], str);  printf(%s %d, %d\n\n , months[month], day, year);  printf(Sun Mon Tue Wed Thu Fri Sat\n );  for (i = 1; i <= maxDay; i++) {    col = getWeekDay(i, month, year, day, weekDay);    if (x > col) {      x = 0;      printf(\n );    }    while (x < col) {      x++;      printf(    );    }    x++;    if (i == day) {      if (i < 10) {        printf( );      }      printf( \e[7m%d\e[0m , i);    } else {      printf(%3d , i);    }  }  printf(\n\n);}int getWeekDay(int day, int month, int year, int rmday, int rwday) {  return (day - rmday + rwday + 35) % 7;}int getMaxDay(int month, int year) {  switch (month) {    case 3: // April    case 5: // June    case 8: // September    case 10:// November      return 30;    case 1: // February      if ((year % 100 == 0 && year % 400 != 0) || year % 4 != 0) {        return 28; // Not leap year      }      return 29; // Leap year    default:      return 31; // Remaining months  }}void getDate(int *second, int *minute, int *hour, int *day, int *month, int *year, int *weekDay) {  time_t now;  struct tm *date;  time(&now);  date = localtime(&now);  *second = (date -> tm_sec);  *minute = (date -> tm_min);  *hour = (date -> tm_hour);  *day = (date -> tm_mday);  *month = (date -> tm_mon);  *year = (date -> tm_year) + 1900;  *weekDay = (date -> tm_wday);}void formatTime(char *str, int hour, int minute, int second) {  sprintf(str, %02d:%02d:%02d %s, (hour % 12) ? (hour % 12) : 12, minute, second, hour / 12 ? PM : AM);  str[11] = '\0';}And the code in ~/.bashrc is just:clear && ~/Documents/C/Calendar/calendarThanks for any help
Is it possible to allow a background process to continuously output to terminal?
command line;terminal;c;background process;cal
I recommend GNU screen for this. First, start up a new screen instance:$ screenThen make a split with Ctrl+A Shift+S. You can resize the top portion with the resize command. I found a height of 9 to be reasonable for cal:Ctrl+A :resize 9Then use any command that constantly produces output. I don't use watch or even have it on many systems, butwhile true; do cal; sleep 3; doneworks just as well.Then Ctrl+A Tab moves you to the other (bottom) part of the split. Finally, Ctrl+A C opens a new shell in which you can run commands without interference from the other portion of the split.If you want this to occur automatically, you can use .screenrc:screen /bin/sh -c 'while true; do cal; sleep 3; done'splitresize 9focusscreenSee screen(1) for a full description of commands, and possible inspiration for alternative configurations.