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Top Forums Shell Programming and Scripting This is driving me nuts error on line 17 Post 302926297 by Scrutinizer on Saturday 22nd of November 2014 11:38:21 PM
Old 11-23-2014
Hi, your are welcome. A good thing to do is run your script with the -x option and use echo statements to debug. For example:
Code:
set -x
read a b c
x=($a + $b + $c)
echo "$x"
x=$((a + b + c))
echo "$x"

This will show something like:
Code:
+ read a b c
2 7 21
+ x=($a + $b + $c)
+ echo 2
2
+ x=30
+ echo 30
30

which allows you to see more of what is going on.

The other thing is get a good book. There are several threads on these forums about this topic.
 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 echo(3XCURSES)
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