By default, the script you run under the BASH debugger does input and output to the same terminal that BASH uses. Before running the script to be debugged, the debugger records the tty that was in effect. All of its output is then written to that. However you can change this when using the ‘bashdb’ script using the ‘-t’ option.
info terminal
¶Displays information recorded by the BASH debugger about the terminal modes your program is using.
Another way to specify where your script should do input and output is
with the tty
command. This command accepts a file name as
argument, and causes this file to be the default for future restart
commands. It also resets the controlling terminal for the child
process, for future restart
commands. For example,
tty /dev/ttyb
directs that processes started with subsequent restart
commands
default to do input and output on the terminal /dev/ttyb and have
that as their controlling terminal.
An explicit redirection in restart
overrides the tty
command’s
effect on the input/output device, but not its effect on the controlling
terminal.
When you use the tty
command or redirect input in the restart
command, only the input for your script is affected. The input
for the BASH debugger still comes from your terminal.