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Injecting text into a terminals input stream

That is a script puts something onto the command line when it exits.
For example, a command user can edit, before pressing return,
or it can do the return itself.

This is different to a 'paste attack', where a block of text that is pasted
runs a command that is hidden in the text.

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From...  https://unix.stackexchange.com/questions/213799

In X windows you can do this...
   xdotool type "ls -l"

For normal terminals you can use TIOCSTI injection
(TIOCSTI : "Terminal IOCtl Send Terminal Input")

  perl -e 'require "sys/ioctl.ph"; ioctl(STDIN, &TIOCSTI, $_);
           for split "", join " ", @ARGV'  ls -l
or
  perl -e 'ioctl(STDIN, 0x5412, $_) for split "", join " ", @ARGV'

to generate the "ioctl.ph" file use
  (cd /usr/include; h2ph -r -l .)

You can also use @mike's Terminology approach
  https://unix.stackexchange.com/a/213805/22565
this sends the terminal a "query status report" escape sequence
which the shell then replaces using a input macro...

   bind '"\e[0n": "echo test"'
   printf '\e[5n'

GNU screen's "stuff" command can also do it

   screen -X stuff 'echo test'

Using Tmux

   tmux send-key -t session:pane ls

NOTE: All but the ioctl method also echos to the screen if done before the
bash "readline" takes over terminal input.

But a script can turn off echo, and wait for the input to be available, then
re-enabling and exiting.  In bash script this is done using "read -t0"

  bind '"\e[0n": "echo test"'
  saved_settings=$(stty -g)
  stty -echo -icanon min 1 time 0
  printf '\e[5n'
  until read -t0; do
    sleep 0.02
  done
  stty "$saved_settings"

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Inject into another terminal you have access to!

See https://unix.stackexchange.com/questions/213799

  inject --tty /dev/pts/22 -- ls -lrt

without the --tty option it defaults to current terminal

The package "console-tools" has a "writevt" command that does this.

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Psuedo terms

This creates a pty running its own bash in such a way that it can
inject a string into its own input stream.

=======8<--------
/* Create a psuedo terminal that is unlocked...
   compile as   gcc -o pts pts.c
   Example use...
     exec 3<>/dev/ptmx
     (setsid -c bash -i 2>&1 | tee log) <>"$(./pts <&3)" 3>&- >&0 &
     echo 'some input' >&3 # write to subshell
     cat <&3               # read results from subshell
*/
#include <stdio.h>
int main(int argc, char *argv[]) {
    if(unlockpt(0)) return 2;
    char *ptsname(int fd);
    printf("%s\n",ptsname(0));
    return argc - 1;
}
=======8<--------

All in one...
https://github.com/johnlane/random-toolbox/blob/master/examples/bash-injectable

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