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Full Discussion: Input value changing into 0
Top Forums Shell Programming and Scripting Input value changing into 0 Post 302772149 by MattyV on Saturday 23rd of February 2013 02:00:16 PM
Old 02-23-2013
OK I think I know what's up...
From the READ manual...

Code:
If count is zero, read() returns zero and has  no  other  results.   If
       count is greater than SSIZE_MAX, the result is unspecified

Also I did a little test...

Code:
cat test.txt

[ASD_HAGDF_CSAS_CMPPRD.s_PRDPR_STNNSTN_CSAS_SRCTPP_COMMHIST006_INC_dat_LD]
[bla.bla]
 [bla.bla] [bla.bla]
\[bla.bla\]
No.Brackets.Bla.Bla
[NO_PERIODS]
[NO.UNDERSCORE]

my results using bash with the debug option....
Code:
#!/bin/bash
while read myline
do
echo $myline 
done < test.txt
+ read myline
+ echo a
a
+ read myline
+ echo a b
a b
+ read myline
+ echo a b a b
a b a b
+ read myline
+ echo a b
a b
+ read myline
+ echo No.Brackets.Bla.Bla
No.Brackets.Bla.Bla
+ read myline
+ echo '[NO_PERIODS]'
[NO_PERIODS]
+ read myline
+ echo '[NO.UNDERSCORE]'
[NO.UNDERSCORE]
+ read myline
+ echo

+ read myline

So I think what happens is that the ^[ or [bl la] is being interpreted as a type of non ASCII character. When I tranpose the brackets on either side of your original string...it shows up...

Code:
#!/bin/bash
while read myline
do
echo $myline 
done < test.txt
+ read myline
+ echo a
a
+ read myline
+ echo a b
a b
+ read myline
+ echo a b a b
a b a b
+ read myline
+ echo a b
a b
+ read myline
+ echo No.Brackets.Bla.Bla
No.Brackets.Bla.Bla
+ read myline
+ echo '[NO_PERIODS]'
[NO_PERIODS]
+ read myline
+ echo '[NO.UNDERSCORE]'
[NO.UNDERSCORE]
+ read myline
+ echo ']ASD_HAGDF_CSAS_CMPPRD.s_PRDPR_STNNSTN_CSAS_SRCTPP_COMMHIST006_INC_dat_LD['
]ASD_HAGDF_CSAS_CMPPRD.s_PRDPR_STNNSTN_CSAS_SRCTPP_COMMHIST006_INC_dat_LD[
+ read myline

I would use a different manner of backing up...
 

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LEARN ABOUT SUNOS

noecho

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 5.10							    5 Jun 2002							    echo(3XCURSES)
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