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Top Forums Shell Programming and Scripting odd problem in read lines from file Post 302552045 by jianma on Thursday 1st of September 2011 12:16:57 PM
Old 09-01-2011
odd problem in read lines from file

Hi,

I wrote a small program to read lines from a file and count the lines. The program is as below:

Code:
filename=$1
count=0    
cat $filename | while read -r line
do  
    printf "%5d:%s\n" $count "$line"
    count=$((count + 1))
done
echo " $count "

After I run the program, the result is below:
Code:
   0:This
    1:is
    2:test
    3:
    4:!
    5:
 0 

I don't understand why the count is still 0 after the read lines loop. Can someone give any advices? Thanks!

Last edited by Franklin52; 09-01-2011 at 01:24 PM.. Reason: Please use code tags for data and code samples, thank you
 

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curs_scroll(3CURSES)					     Curses Library Functions					      curs_scroll(3CURSES)

NAME
curs_scroll, scroll, scrl, wscrl - scroll a curses window SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ] #include <curses.h> int scroll(WINDOW *win); int scrl(int n); int wscrl(WINDOW *win, int n); DESCRIPTION
With the scroll() routine, the window is scrolled up one line. This involves moving the lines in the window data structure. As an optimiza- tion, if the scrolling region of the window is the entire screen, the physical screen is scrolled at the same time. With the scrl() and wscrl() routines, for positive n scroll the window up n lines (line i+n becomes i); otherwise scroll the window down n lines. This involves moving the lines in the window character image structure. The current cursor position is not changed. For these functions to work, scrolling must be enabled via scrollok(). RETURN VALUES
All routines return the integer ERR upon failure and an integer value other than ERR upon successful completion. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
curs_outopts(3CURSES), curses(3CURSES), attributes(5) NOTES
The header <curses.h> automatically includes the headers <stdio.h> and <unctrl.h>. Note that scrl() and scroll() may be macros. SunOS 5.11 31 Dec 1996 curs_scroll(3CURSES)
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