What is the equivalent to getch() & getche() in Linux?

#include <termios.h>#include <stdio.h>static struct termios old, current;/* Initialize new terminal i/o settings */void initTermios(int echo) {  tcgetattr(0, &old); /* grab old terminal i/o settings */  current = old; /* make new settings same as old settings */  current.c_lflag &= ~ICANON; /* disable buffered i/o */  if (echo) {      current.c_lflag |= ECHO; /* set echo mode */  } else {      current.c_lflag &= ~ECHO; /* set no echo mode */  }  tcsetattr(0, TCSANOW, &current); /* use these new terminal i/o settings now */}/* Restore old terminal i/o settings */void resetTermios(void) {  tcsetattr(0, TCSANOW, &old);}/* Read 1 character - echo defines echo mode */char getch_(int echo) {  char ch;  initTermios(echo);  ch = getchar();  resetTermios();  return ch;}/* Read 1 character without echo */char getch(void) {  return getch_(0);}/* Read 1 character with echo */char getche(void) {  return getch_(1);}/* Let's test it out */int main(void) {  char c;  printf("(getche example) please type a letter: ");  c = getche();  printf("\nYou typed: %c\n", c);  printf("(getch example) please type a letter...");  c = getch();  printf("\nYou typed: %c\n", c);  return 0;}

Output:

(getche example) please type a letter: gYou typed: g(getch example) please type a letter...You typed: g

#include <unistd.h>#include <termios.h>char getch(void){    char buf = 0;    struct termios old = {0};    fflush(stdout);    if(tcgetattr(0, &old) < 0)        perror("tcsetattr()");    old.c_lflag &= ~ICANON;    old.c_lflag &= ~ECHO;    old.c_cc[VMIN] = 1;    old.c_cc[VTIME] = 0;    if(tcsetattr(0, TCSANOW, &old) < 0)        perror("tcsetattr ICANON");    if(read(0, &buf, 1) < 0)        perror("read()");    old.c_lflag |= ICANON;    old.c_lflag |= ECHO;    if(tcsetattr(0, TCSADRAIN, &old) < 0)        perror("tcsetattr ~ICANON");    printf("%c\n", buf);    return buf; }

Remove the last printf if you don't want the character to be displayed.

I suggest you use curses.h or ncurses.h these implement keyboard management routines including getch(). You have several options to change the behavior of getch (i.e. wait for keypress or not).