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Uses stdin of the shell to simulate input string and type a command to run.
#include <strings.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
const char *TYPE_CMD_TYPE = "TYPE_CMD_TYPE";
const char *PROGRAM_NAME = "type-command";
int main(void) {
struct termios oldtio,newtio;
int fd=0;
int i;
char *is_enabled;
char *command;
// read the bash variables
is_enabled = getenv(TYPE_CMD_ENABLED);
command = getenv(TYPE_CMD_TYPE);
// is the var defined at all
if ( ! is_enabled ) {
printf("%s: the variable %s is not set, set it to 'no' to surpress this message\n", PROGRAM_NAME, TYPE_CMD_ENABLED);
return 0;
// has the variable value different than 'yes'
} else if ( strcmp(is_enabled, "yes") ) {
return 0;
if ( ! command ) {
return 0;
tcgetattr(fd,&oldtio); // save current terminal settings
bzero(&newtio, sizeof(newtio)); // clear struct for new port settings
memcpy(&newtio, &oldtio, sizeof(oldtio) );
newtio.c_lflag &= ~ECHO; // do not echo the input chars
tcflush(fd, TCIFLUSH); // set the new terminal settings
for (i = 0; i < strlen(command); i++)
ioctl(fd, TIOCSTI, &command[i]);
return 0;
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