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sshpass-broken.md

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All the examples are tested with sshpass-1.06.

Example #1

With sshpass:

$ tty
/dev/pts/18                                      // now we're on pts/18
$ sshpass bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device    <<< Bash not happy
bash: no job control in this shell                                              <<< Bash not happy
bash-4.4# tty
/dev/pts/18                                      // the bash's stdin is also connected to pts/18
bash-4.4# ps p $$
   PID TTY      STAT   TIME COMMAND
 37151 pts/36   Ss+    0:00 bash --norc          // but the controlling terminal is pts/36
bash-4.4# ps t pts/36
   PID TTY      STAT   TIME COMMAND
 37151 pts/36   Ss+    0:00 bash --norc
 37154 pts/36   R+     0:00 ps t pts/36
bash-4.4#

Now let's try passh:

$ tty
/dev/pts/18                                      // now we're on pts/18
$ passh bash --norc
bash-4.4# tty
/dev/pts/36                                      // the bash's stdin is connected to the new pts/36
bash-4.4# ps p $$
   PID TTY      STAT   TIME COMMAND
 37159 pts/36   Ss     0:00 bash --norc          // pts/36 is its controlling terminal
bash-4.4# ps t pts/36
   PID TTY      STAT   TIME COMMAND
 37159 pts/36   Ss     0:00 bash --norc
 37162 pts/36   R+     0:00 ps t pts/36
bash-4.4#

Example #2

$ sshpass bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-5.0#    <== Press Ctrl-C here and the shell will be killed.

Example #3

$ sshpass bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-5.0# sleep 60
    <== Press Ctrl-C to kill 'sleep' but Bash would also be killed.

Example #4

$ sshpass bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-5.0# read < /dev/tty
it
cannot
read
from
/dev/tty
          <== The 'read' never returns. Ctrl-D does not work either.
          <== You have to press Ctrl-C to kill bash.

Example #5

$ sshpass bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-5.0# echo password: > /dev/tty
bash-5.0#                            <== It hangs here. Press Ctrl-C to kill it.

Example #6

$ sshpass -p xxx bash --norc
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
bash-5.0# echo password: > /dev/tty
bash-5.0# echo password: > /dev/tty
$                                    <== The two echo commands killed Bash.

Example #7

# sshpass -p some-passwd ssh no-such-user@127.0.0.1 date
# echo $?                            <== It silently fails. No error messages.
5
#