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Full Discussion: Problem reading terminal response string from Zsh
Top Forums Shell Programming and Scripting Problem reading terminal response string from Zsh Post 303010590 by Chubler_XL on Wednesday 3rd of January 2018 08:19:19 PM
Old 01-03-2018
In bash you could simplify the logic as -t will timeout if a full line is not received

Code:
#!/bin/bash

str='' # Buffer for response
tty=$(tty)

# Send query string to terminal. Example: Esc Z queries for terminal id
echo -e '\e'${1:-Z}  >$tty

# Read response from terminal (200ms timeout empty delimiter)
read -rs -t 0.2 -d "" <$tty

# Output response without leading Esc
echo "Response: ${REPLY#?}"

Under zsh -t is just a timeout for the first character being available. Use return value of read to detect a timeout, as REPLY is not emptied on timeout:

Code:
#!/bin/zsh
str='' # Buffer for response
tty=$(tty)

# Send query string to terminal. Example: Esc Z queries for terminal id
echo -e '\e'${1:-Z}  >$tty

# Read response from terminal
while :
do
  read -rs -t 0.2 -k 1 <$tty || break
  str="${str}$REPLY"
done


# Output response without leading Esc
echo "Response: ${str#?}"

Last edited by Chubler_XL; 01-03-2018 at 09:30 PM..
 

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LEARN ABOUT LINUX

tty

TTY(4)							     Linux Programmer's Manual							    TTY(4)

NAME

       tty - controlling terminal

DESCRIPTION

       The  file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty.  It is a syn-
       onym for the controlling terminal of a process, if any.

       In addition to the ioctl(2) requests supported by the device that tty refers to, the ioctl(2) request TIOCNOTTY is supported.

   TIOCNOTTY
       Detach the calling process from its controlling terminal.

       If the process is the session leader, then SIGHUP and SIGCONT signals are sent to the foreground process group and  all	processes  in  the
       current session lose their controlling tty.

       This ioctl(2) call only works on file descriptors connected to /dev/tty.  It is used by daemon processes when they are invoked by a user at
       a terminal.  The process attempts to open /dev/tty.  If the open succeeds, it detaches itself from the terminal by using  TIOCNOTTY,  while
       if the open fails, it is obviously not attached to a terminal and does not need to detach itself.

FILES

       /dev/tty

SEE ALSO

       chown(1), mknod(1), ioctl(2), termios(3), console(4), tty_ioctl(4), ttyS(4), agetty(8), mingetty(8)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2003-04-07								    TTY(4)
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