A bug report: misperforming equality test

[Anthra Norell]

From: default
To: bug-bash@gnu.org
Subject: Misperforming equality test

 

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: cygwin
Compiler: i686-pc-cygwin-gcc
Compilation CFLAGS:  -DPROGRAM='bash.exe' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE=\
'cygwin' -DCONF_MACHTYPE='i686-pc-cygwin' -DCONF_VENDOR='pc' -DSHELL -DHAVE_CON\
FIG_H -DRECYCLES_PIDS  -I.  -I../bash-2.05b -I../bash-2.05b/include -I../bash-2\
.05b/lib  -g -O2
uname output: CYGWIN_ME-4.90 mcuf7 1.3.22(0.78/3/2) 2003-03-18 09:20 i686 unkno\
wn unknown Cygwin
Machine Type: i686-pc-cygwin

 

Bash Version: 2.05b
Patch Level: 0
Release Status: release

 

Description:

 

   An arithmetic equality test misperforms in a script. (It works okay on the command line.)

 

Repeat-By:

 

   See below

 

---------------------------------------------------------------------------------------------------------------

 

 

 

All bug reports should include:

 

   1) The version number of Bash.
   2) The hardware and operating system
   3) The compiler used to compile Bash
   4) A description of the bug behaviour
   5) A short script or `recipe' which exercises the bug and may be used to reproduce it.
   6) bashbug inserts the first three items automatically into the template it provides for filing a bug report.

 

 

 

1) The version number of Bash

 

   $ set | awk /VER/
   BASH_VERSINFO=([0]="2" [1]="05b" [2]="0" [3]="9" [4]="release" [5]="i686-pc-cygwin")
   BASH_VERSION='2.05b.0(9)-release'

 

2) The hardware and operating system

 

   Hardware: Dell Inspiron 8000
   OS: Windows ME

 

3) The compiler used to compile Bash

 

   Downloaded from Cygnis. Compiler unknown. See above..

 

4) A description of the bug behaviour

 

   An arithmetic equality test misperforms in a script. (It works okay on the command line.)

 

5) A short script or `recipe' which exercises the bug and may be used to reproduce it.

 

   01 symbols=$(active_us_symbols.sh)
   02 max_symbols_per_line=50
   03 string='http://www.quicken.com/investments/quotes/?symbol='
   04 symbol_counter=0
   05 for symbol in $symbols
   06 do
   07   echo $symbol
   08   echo $symbol_counter
   09   echo $max_symbols_per_line
   10   if ((symbol_counter==max_symbols_per_line))   <<< EQUALITY TEST MALFUNCTIONS !!!
   11     then echo ==
   12     string=$string'&B1=Go '
   13     echo $string
   14     string='http://www.quicken.com/investments/quotes/?symbol='
   15     symbol_counter=0
   16   else
   17     string=$string$symbol+
   18     ((++symbol_counter))
   19     echo $symbol_counter
   20   fi
   21 done
   22 echo $string

 

   The echoes:

 

   05
   06
   07 AAON
   08 0
   09 50
   10 <<< EQUALITY TEST MALFUNCTIONS !!!
   11 ==
   12
   13 http://www.quicken.com/investments/quotes/?symbol=&B1=Go
   14
   15
   20
   21
   05
   06
   07 AAPL
   08 0
   09 50
   11 ==
   12
   13 http://www.quicken.com/investments/quotes/?symbol=&B1=Go
   05
   06
   07 ABB
   08 0
   09 50
   11 ==
   12
   13 http://www.quicken.com/investments/quotes/?symbol=&B1=Go
   14
   15
   20
   21
   05
   06
   07 ABC
   08 0
   09 50
   11 ==
   12
   13 http://www.quicken.com/investments/quotes/?symbol=&B1=Go
   05
   06
   07 ABLZF
   08 0
   09 50
   11 ==
   14
   15
   20
   21
      etc.

 

   The same test works perfectly well on the command line with indentations and all:

 

   $ echo $symbol_counter $max_symbols_per_line
   0 50
   $    if ((symbol_counter==max_symbols_per_line));    then echo equal; echo really
   equal;   else echo not equal; echo really not equal; fi
   not equal
   really not equal