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Full Discussion: Please explain read in a while loop
Top Forums Shell Programming and Scripting Please explain read in a while loop Post 95494 by mahendramahendr on Wednesday 11th of January 2006 04:30:12 PM
Old 01-11-2006
Code:
 while read line
do
read test?"Enter a Value:"
done < testfile


In the above code, in the first line, it says read line.. it reads the first line from the testfile and puts it into the variable called line, again when you say read test, it actually reads the second line from testfile and puts it into the variable test.. it won't take the input from the keyboard because you have given the input as testfile by specifying the "<".

use this code

#!/usr/bin/ksh

IFS="
"

for line in $(< testfile)
do
echo $line
echo "Enter value :"
read a
done
Last edited by mahendramahendr; 01-11-2006 at 05:44 PM..
 

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LEARN ABOUT OSX

yencode

yencode(n)					       Text encoding & decoding binary data						yencode(n)

__________________________________________________________________________________________________________________________________________________

NAME

       yencode - Y-encode/decode binary data

SYNOPSIS

       package require Tcl  8.2

       package require yencode	?1.1.2?

       ::yencode::encode string

       ::yencode::decode string

       ::yencode::yencode ?-name string? ?-line integer? ?-crc32 boolean? (-file filename | ?--? string)

       ::yencode::ydecode (-file filename | ?--? string)

_________________________________________________________________

DESCRIPTION

       This  package  provides	a Tcl-only implementation of the yEnc file encoding. This is a recently introduced method of encoding binary files
       for transmission through Usenet. This encoding packs binary data into a format that requires an 8-bit clean  transmission  layer  but  that
       escapes characters special to the NNTP posting protocols. See http://www.yenc.org/ for details concerning the algorithm.

       ::yencode::encode string
	      returns the yEnc encoded data.

       ::yencode::decode string
	      Decodes the given yEnc encoded data.

       ::yencode::yencode ?-name string? ?-line integer? ?-crc32 boolean? (-file filename | ?--? string)
	      Encode a file or block of data.

       ::yencode::ydecode (-file filename | ?--? string)
	      Decode a file or block of data. A file may contain more than one embedded file so the result is a list where each element is a three
	      element list of filename, file size and data.

OPTIONS

       -filename name
	      Cause the yencode or ydecode commands to read their data from the named file rather that taking a string parameter.

       -name string
	      The encoded data header line contains the suggested file name to be used when unpacking the data. Use this  option  to  change  this
	      from the default of "data.dat".

       -line integer
	      The  yencoded  data  header  line contains records the line length used during the encoding. Use this option to select a line length
	      other that the default of 128. Note that NNTP imposes a 1000 character line length limit and some gateways  may  have  trouble  with
	      more than 255 characters per line.

       -crc32 boolean
	      The  yEnc  specification	recommends  the  inclusion of a cyclic redundancy check value in the footer. Use this option to change the
	      default from true to false.

       % set d [yencode::yencode -file testfile.txt]
       =ybegin line=128 size=584 name=testfile.txt
	-o- data not shown -o-
       =yend size=584 crc32=ded29f4f

REFERENCES

       [1]    http://www.yenc.org/yenc-draft.1.3.txt

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the  category  base64
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       encoding, yEnc, ydecode, yencode

CATEGORY

       Text processing

COPYRIGHT

       Copyright (c) 2002, Pat Thoyts

base64								       1.1.2								yencode(n)
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