linux - write commands from one terminal to another

Question

I need to write commands from one terminal to another terminal.

I tried these:

echo -e \"ls\\n\" > /proc/pid/fd/0
echo -e \"ls\\n\" > /dev/pts/         


        

Answer 1

This is hairy. The stdin file in proc you're trying to use is a symlink to the terminal device (probably /dev/pts/something). There are two processes that have that device open: the shell (your target) and the terminal emulator (e.g. gnome-terminal), and they use it like a socket to pass data in both directions. Presumably the latter is stealing the output and displaying it, so the shell never sees it. I don't think this technique will work.

What are you trying to accomplish? You can't run the process as a child using conventional tools like popen()? If it's a GUI terminal emulator, you could try to forge keyboard input via X events or the kernel's uinput API.

Answer 2

Python code:

#!/usr/bin/python

import sys,os,fcntl,termios
if len(sys.argv) != 3:
   sys.stderr.write("usage: ttyexec.py tty command\n")
   sys.exit(1)
fd = os.open("/dev/" + sys.argv[1], os.O_RDWR)
cmd=sys.argv[2]
for i in range(len(cmd)):
   fcntl.ioctl(fd, termios.TIOCSTI, cmd[i])
fcntl.ioctl(fd, termios.TIOCSTI, '\n')
os.close(fd)

Answer 3

This is the wrong way to go about it - you might get it displayed in the terminal, but not executed.

You will need to do something like tell a shell to read from a named pipe, or from netcat/socat. Or you could try injecting keystrokes as root or using xtest (there's also sometimes another way under X which I forget).

Answer 4

command > dev/pts/# where # is the other terminal's name

Answer 5

open 2 terminals then type ttd on the terminal which you want to write on ttd will show you the address of the terminal move to the another terminal and type cat > (address of the 2nd terminal) and hit enter

Answer 6

look at:

man 1 script

for example:

script -f /dev/tty1