Sponsored Content
Top Forums Shell Programming and Scripting Please explain read in a while loop Post 95485 by jerardfjay on Wednesday 11th of January 2006 02:25:18 PM
Old 01-11-2006
Please explain read in a while loop

I have a script which tries to read input from a user for every value read from a file. The input file is

Code:
#> more testfile
TEST1 | D200 | 12345601 | | ABC company | m
TEST2 | D201 | 12345602 | | ABC company | m

The script test.sh is as follows

Code:
while read line
do
read test?"Enter a Value:"
done < testfile

however when executed, shell never responds to a the read command.

Code:
#>test.sh
#>

Is there a special read option that I have to use when using read within a while loop? Any help is greatly appreciated. Thanks

Jerardfjay Smilie
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Need Help : while read loop

hi all, Can you please help me with this issue ? while ####infinite loop do cat file1 |while read var1 var2 do func1 $var1 $var2 done cat file2 | while read var11 var22 do func2 $var11 $var22 done done func1 is called till all the values are read... (2 Replies)
Discussion started by: Navatha
2 Replies

2. Shell Programming and Scripting

read line in a for loop

Hi All, How can we use read line using the index value of a FOR loop? eg: pt_mstr,pt_status,8 pt_mstr,pt_buyer,8 pt_mstr,pt_sfty_stk,8 pt_mstr,pt_ord_pol,3 pt_mstr,pt_capacity,8 pt_mstr,pt_plan_ord,3 pt_mstr,pt_ord_mult,8 From this file i want to read the line2, 3 and 4 only using a FOR... (3 Replies)
Discussion started by: balajim
3 Replies

3. UNIX for Dummies Questions & Answers

if elif loop with read

I am trying to setup an if, elif statement that is dependant on a variable. If the user does not enter a valid option I would like it to prompt them again and start the loop over. Here is what I have so far: echo -n "enter variable (a, b, or c): " read freq if ; then echo "a" elif ;... (2 Replies)
Discussion started by: BStanley346
2 Replies

4. Shell Programming and Scripting

Need help with for loop with while read

Hello, The code below pulls printer information from a three-column file (set by the ${MULTIFILE} variable at the end), that has the printer queue name, IP, and type of printer. It is supposed to use this info to add the printers in the list to one, or more servers . The input file... (3 Replies)
Discussion started by: LinuxRacr
3 Replies

5. Shell Programming and Scripting

until loop and read

Hi guys what I wanna do is to create a script where can I input several times a file - assume with read function that will be inserted into a temp. file for further processing. When I press q I want that the loop will stop and continue in my script I typed this but the options q is not working... (6 Replies)
Discussion started by: kl1ngac1k
6 Replies

6. Filesystems, Disks and Memory

Please explain how to read df -k

What I'm trying to find out is how many gb do we actually have free, how do you calculate that with the following output from the df -k command. Filesystem 1024-blocks Free %Used Iused %Iused Mounted on /dev/prod001 46137344 9200468 81% 26166 1% ... (6 Replies)
Discussion started by: NycUnxer
6 Replies

7. UNIX for Dummies Questions & Answers

Read statement within while read loop

hi, this is my script #!/bin/ksh cat temp_file.dat | while read line do read test if ]; then break else echo "ERROR" fi done when i execute this code , the script does wait for the user input . it directly prints "ERROR" and terminates after the no. of times as there... (3 Replies)
Discussion started by: siva1612
3 Replies

8. Shell Programming and Scripting

explain while loop in ksh shell script

#!/bin/ksh log=ABCl log=EFG log=HIJ i=0 while <------ what is the meaning of ($i - lt 3) do print ${log} (( i=i+1 )) done (1 Reply)
Discussion started by: Bperl1967
1 Replies

9. Shell Programming and Scripting

Help with while read loop

Hey all, Tried searching the forums but my search-fu may not be strong today; please feel free to redirect me if I have simply missed a post that would be helpful! Trying to create a while loop that reads a list of configuration files, checks for a line that starts with "SOME_CMD" and ends... (4 Replies)
Discussion started by: jdwyer
4 Replies

10. Shell Programming and Scripting

Please explain AWK Fibonnaci for loop

Referring to this: #!/bin/awk -f BEGIN{ for(i=0;i<=10;i++) { if (i <=1 ) { x=0; y=1; print i; } else { z=x+y; print z; x=y; y=z; } } (3 Replies)
Discussion started by: p1ne
3 Replies
EMPTY-PAGE(1)							 ExactImage Manual						     EMPTY-PAGE(1)

NAME
empty-page - empty page detector of the ExactImage toolkit SYNOPSIS
empty-page [option...] {-i | --input} input-file empty-page {-h | --help} DESCRIPTION
ExactImage is a fast C++ image processing library. Unlike many other library frameworks it allows operation in several color spaces and bit depths natively, resulting in low memory and computational requirements. empty-page counts dark pixels of a black and white image and decides with a threshold whether the page is most probably empty, and thus can be removed from the image processing stream. OPTIONS
-i file, --input file Read image from the specified file. -m n, --margin n Set width of border margin to skip. For speed reasons, the margin has to be a multiple of 8. The default is 16. -p x, --percentage x Set fraction of permissible dark pixels. The default is 0.05 (5%). -h, --help Display help text and exit. EXAMPLES
$ empty-page -i test.tif The image has 75461 dark pixels from a total of 1060992 (7.11231%). non-empty EXIT STATUS
The exit status is 0 if the image is mostly white, 1 otherwise. SEE ALSO
exactimage(7) AUTHORS
Jakub Wilk <jwilk@debian.org> Wrote this manual page for the Debian system. http://www.exactcode.de/site/open_source/exactimage/ This manual page incorporates texts found on the ExactImage homepage. COPYRIGHT
This manual page was written for the Debian system (and may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or (at your option) any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2. empty-page 09/09/2013 EMPTY-PAGE(1)
All times are GMT -4. The time now is 01:24 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy