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functions not working

 
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Top Forums UNIX for Dummies Questions & Answers functions not working
# 8  
Old 12-29-2001
Re: One Step Back
Quote:
Originally posted by darthur
Perderabo,

I tried your suggestion....

echo qmgrcount = $qmgrcount > /dev/tty


but this just outputs "qmgrcount =" when it gets to this part of the function.
This tells that the value of qmgrcount is null or just white space at the point of the echo. That is not what you expected, right? So you are zeroing in on the bug. Think what value you expected for qmgrcount. Until you fix the line that sets qmgrcount your script isn't going to work. You have effectively done this:
qmgrcount=""
just before your if statement. And as we said your if statement will only do something if qmgrcount is 0 or 1 or 2.

This is how I debug my scripts. I put in echo statements to see what values are being set to my variables. When I find a variable whose value doesn't look right, I work with the script until I get it right.

A few posts ago, you spoke of piping the output of wc -l to cut to extract the 8th field. That is crazy, there is no 8th field.
 
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LEARN ABOUT SUSE

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 3.25 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)